selectedPicdark

Nanodevices

RESEARCH

DEPARTMENTS
Nanoelectronics engineering
RESEARCH GROUPS
SystemsEngineerings
nanodevices
spintronics

DESCRIPTION

The nanodevices group develops integrated sensor solutions for the biomedical, food and environment areas, as well as industrial sensing applications. In the biomedical sensor area, magnetoresistive based protein or DNA chips, and magnetoresistive cytometers (technologies previously developed at INESC MN-Lisbon), are now being tested in different clinical applications. The bioanalyte is labelled with a magnetic nanoparticle or bead, through an intervenient antibody, aptamer, complementary DNA strand, and after recognition, the signal is read in the magnetoresistive sensor array. Label-free technologies are also being developed, using direct molecular fingerprinting of compounds and molecules using microfluidics, an optical detection, starting with discrete assembly of pre-existent modules (microfluidic reactor, light source, optical spectrometer) to the full integration of components at the wafer level in collaboration with partners. The group (together with the spintronics group) is actively involved on the prototyping of tunnel magnetoresistive based sensors for industrial applications.

RESEARCH PROJECTS

Project INVENNTA II (in collaboration with the neuroscience group of J Castillo, at IDIS-H Universitario de Santiago de Compostela)

Team: INL ( Elizabete Fernandes, P.P.Freitas)

           IDIS, T Sobrino, J Castillo

          Other collaborators:  S Cardoso, and T.Dias at INESC MN, under subcontract, supplying MR chip technology

project 1

Platforms, PCBs, and magnetoresistive chips, being used for the multiplexed detection of ischemic stroke patient biomarkers

Conference presentation: Fernandes E., Martins V., Dias T., Germano J., Sobrino T., Cardoso S., Castillo J., Rivas J., Freitas PP. Simultaneous interrogation of multiple targets using a magnetoresistive (MR) biochip platform. Biosensors 2016, Gothenburg, Sweden 25-27 May 2016

Project INVENNTA II (in collaboration with the oncology group of R. Lopez, at IDIS-H Universitario de Santiago de Compostela)

Team: INL ( Alexandre Chicharo, P.P.Freitas, L Dieguez, B.Espina, M.Martins, J.Piteira)

            IDIS, R Lopez

            Other collaborators: S Cardoso at INESC MN, supplying MR cytometer chips

Cell labelled with magnetic beads

Cell labelled with magnetic beads


MR cytometer PCB, with integrated microfluidics and sensors

MR cytometer PCB, with integrated microfluidics and sensors

Conference presentation: A. Chícharo, M. Martins, B. Espiña, S. Cardoso and P. Freitas, High-throughput magnetic flow cytometer for tumour cell quantification, 13th Joint MMM-Intermag Conference, January 11-15, 2016, San Diego, California, US.

Exploiting spin transfer based nano-oscillators and spin Hall devices. Inl hosts one PhD student ( Mohammad Tarequzzaman) and has hosted one post doctoral fellow ( Bertrand Lacoste) with joint co-advising from Ricardo Ferreira (Spintronics), and P.Freitas. (more details in the spintronics group site).

This project is based on a COFUND fellowship holder ( Hongyan Bi) and addresses the specific, accurate, and fast quantification through optical means of compounds within a complex matrix background.

Schematic illustration of the microfluidic sensor integrated with after-channel UV/vis spectrophotometric detection for food ingredient analysis. (b) Collected absorbance change at 266 nm of solutions containing only caffeine, and mixture of AA and caffeine before (A0) and after (A) passing through the enzyme-loaded microfluidic sensor at 5 μL/min. Arrows indicate the time when it is started to sample the solution through the microfluidic channel.

Schematic illustration of the microfluidic sensor integrated with after-channel UV/vis spectrophotometric detection for food ingredient analysis. (b) Collected absorbance change at 266 nm of solutions containing only caffeine, and mixture of AA and caffeine before (A0) and after (A) passing through the enzyme-loaded microfluidic sensor at 5 μL/min. Arrows indicate the time when it is started to sample the solution through the microfluidic channel.

Publication: H. Bi, A. C. Fernandes, S. Cardoso and P. Freitas, Interference-Blind Microfluidic Sensor for Ascorbic Acid Determination by UV/vis Spectroscopy. Sensors and Actuators B: Chemical, 2016, 224, 668-675.

Starting project in collaboration with the Systems Engineering group, and external partners, to develop a fully integrated microspectrometer using CMOS based or a-Si:H based photodiodes, thin film multilayer band pass filters, and LEDS, into a compact format suitable for integration with control and communication hardware for a portable solution.

This project is being developed within the PhD thesis of M.Costa ( NanoFab). The goal is to incorporate magnetoresistive sensors with typical features of 100nm on the tip of AFM cantilevers, providing direct field mapping through an AFM probe.

Resonance characterization of the cantilever with a resonance frequency of ∼250 kHz. (b) Voltage output versus the external applied magnetic field response of an individualSV sensor already integrated in an AFM cantilever.

Resonance characterization of the cantilever with a resonance frequency of ∼250 kHz. (b) Voltage output versus the external applied magnetic field response of an individualSV sensor already integrated in an AFM cantilever.

Publication: “Integration of magnetoresistive sensors with atomic force microscopy cantilevers for scanning magnetoresistance microscopy applications”, M. Costa, J. Gaspar, R. Ferreira, E. Paz, H. Fonseca, M. Martins, S. Cardoso, and P. P. Freitas, IEEE Trans. Magnetics, vol. 51, no. 11, pp. 6503104, Nov. 2015

PUBLICATIONS

2016

H Bi A.C.Fernandes, S.Cardoso ; P.P.Freitas,

Interference-blind microfluidic sensor for ascorbic acid determination by UV/vis spectroscopy Journal Article

Sensors and Actuactos B, Chemical, 224 , pp. 668, 2016.

BibTeX

P.P.Freitas S.Cardoso, R.Ferreira

Spintronic Sensors Journal Article

Proceedings of IEEE , 104 (10), pp. 1894-1918, 2016.

BibTeX

T.J.Huisman Mikhaylovskiy, Costa R V ; J D

Femtosecond control of electric currents in metallic ferromagnetic heterostructures Journal Article

Nature Nanotechnology, 11 , pp. 455, 2016.

BibTeX

E.Paz R.Ferreira, P.P.Freitas

Linearization of magnetic sensors with a weakly-pinned free layer MTJ stack using a 3 step annealing process Journal Article

IEEE Transactions on Magnetics, 52 (7), 2016.

BibTeX

Vieira NCS ; Borme, J ; Machado G ; Cerqueira F ; Freitas PP  ; Zucolotto V; Peres NMR ; Alpuim J.Phys P 

Graphene field-effect transistor array with integrated electrolytic gates scaled to 200 mm Journal Article

Cond Matter, 28 , 2016.

Links | BibTeX

2015

A. Ravelo I. Sergio, Ramirez Cardoso Ferreira Freitas D S R P P

Total ionizing dose (TID) evaluation of magnetic tunnel junction (MTJ) current sensors Journal Article

Sensors and Actuators a-Physical, 225 (119-127), 2015.

BibTeX

J. Valadeiro J. Amaral, Leitao Ferreira Cardoso D C R S; Freitas, P P

Strategies for pTesla Field Detection Using Magnetoresistive Sensors With a Soft Pinned Sensing Layer Journal Article

IEEE Trans. Magn, 51 (1), pp. 4400204, 2015.

BibTeX

S. Sievers N. Liebing, Serrano-Guisan Ferreira Paz Caprile Manzin Pasquale Skowronski Stobiecki Rott Reiss Langer Ocker Schumacher S R E A A M W T K G J B H W

Toward Wafer Scale Inductive Characterization of Spin-Transfer Torque Critical Current Density of Magnetic Tunnel Junction Stacks Journal Article

IEEE Trans. Magn, 51 (1), pp. 1400804, 2015.

Links | BibTeX

A. Caprile A. Manzin, Coisson Pasquale Schumacher Liebing Sievers Ferreira Serrano-Guisan M M H W N S R S; Paz, E

Static and Dynamic Analysis of Magnetic Tunnel Junctions With Wedged MgO Barrier Journal Article

IEEE Trans. Magn, 51 (1), pp. 4400304, 2015.

Links | BibTeX

V. Silvérioa S. Cardosob, Gaspard Paulo Freitas Moreiraa J P A L N

Design, fabrication and test of an integrated multi-microchannel heat sink for electronics cooling Journal Article

Sensors and Actuactors A, Physical, 235 (14), pp. 235, 2015.

BibTeX

Costa J. D.; Serrano-Guisan, Borme S ; J

Impact of MgO Thickness on the Performance of Spin-Transfer Torque Nano-Oscillators Journal Article

Ieee Transactions on Magnetics , 51 (11), 2015.

BibTeX

M.Costa J.Gaspar, R.Ferreira E.Paz H.Fonseca M.Martins S.Cardoso P.P.Freitas

Integration of magnetoresistive sensors with atomic force microscopy cantilevers for scanning magnetoresistance microscopy applications Journal Article

IEEE Transactions on Magnetics, 51 , 2015.

BibTeX

A.V.Silva D.C.Leitao, J.Valadeiro J.Amaral P.P.Freitas Cardoso S

Linearization strategies for high sensitivity magnetoresistive sensors Journal Article

Eur. Phys. J. Appl. Phys., 72 , 2015.

BibTeX

D.Couto R. Sousa, Andrade Leander Lopez-Quintela J.Rivas P.P.Freitas M.Lima Porto B.Porto F.Carvalho Fernandes L M M A G E

Polyacrylic acid coated and non-coated iron-oxide nanoparticles are not genotoxic to human T-lymphocites Journal Article

Toxicology Letters, 234 (67), 2015.

BibTeX

2014

D. C. Leitao E. Paz, Silva Moskaltsova Knudde Deepak Ferreira Cardoso A A S F L R S; Freitas, P P

Nanoscale Magnetic Tunnel Junction Sensing Devices With Soft Pinned Sensing Layer and Low Aspect Ratio Journal Article

IEEE Trans. Magn, 50 (11), pp. 4410508, 2014.

Links | BibTeX

F. A. Cardoso L. S. Rosado, Franco Ferreira Paz Cardoso Ramos Piedade F R E S P M M; Freitas, P P

Improved Magnetic Tunnel Junctions Design for the Detection of Superficial Defects by Eddy Currents Testing Journal Article

IEEE Trans. Magn, 50 (11), pp. 6201304, 2014.

Links | BibTeX

X. Q. Bao R. Ferreira, Paz Leitao Silva Cardoso Freitas E D A S P P; F.Liu, L

Ordered arrays of tilted silicon nanobelts with enhanced solar hydrogen evolution performance Journal Article

Nanoscale, 6 , pp. 2097-2101, 2014.

BibTeX

S. Cardoso D. C. Leitao, Gameiro Cardoso Ferreira Paz L F R E; Freitas, P P

Magnetic tunnel junction sensors with pTesla sensitivity Journal Article

Microsyst. Technol., 20 , pp. 793-802, 2014.

BibTeX

Z. Hou A. Silva, Leitao Ferreira Cardoso D C R S; Freitas, P P

Micromagnetic and magneto-transport simulations of nanodevices based on MgO tunnel junctions for memory and sensing applications Journal Article

Physica B: Condensed Matter, 435 , pp. 163-167, 2014.

Links | BibTeX

D. W. Guo F. A. Cardoso, Ferreira Paz Cardoso R E S; Freitas, P P

MgO-based magnetic tunnel junction sensors array for non-destructive testing applications Journal Article

J. Appl. Phys., 115 , pp. 17E513, 2014.

Links | BibTeX

F. A. Cardoso L. Rosado, Ferreira Paz Cardoso Ramos Piedade R E S P M M; Freitas, P P

Magnetic tunnel junction based eddy current testing probe for detection of surface defects Journal Article

J. Appl. Phys., 115 (17), pp. 15E16, 2014.

Links | BibTeX

D. C. Leitao A. Silva, Ferreira Paz Deepack Cardoso R E F L S; Freitas, P P

Linear nanometric tunnel junction sensors with exchange pinned sensing layer Journal Article

J. App. Phys., 115 (17), pp. 17E526, 2014.

Links | BibTeX

2013

E. Paz S. Serrano-Guisan, Ferreira R; Freitas, P P

Room temperature direct detection of low frequency magnetic fields in the 100 pT/Hz(0.5) range using large arrays of magnetic tunnel junctions Journal Article

J. App. Phys., 115 (17), pp. 17E501, 2013.

Links | BibTeX

A. Silva D. Leitao, Huo Macedo Ferreira Paz Deepak Cardoso Z R R E F L S; Freitas, P P

Switching Field Variation in MgO Magnetic Tunnel Junction Nanopillars: Experimental Results and Micromagnetic Simulations Journal Article

IEEE Trans. Magn, 49 (7), pp. 4405-4408, 2013.

BibTeX

A. Lopes S. Cardoso, Ferreira Paz Deepak Sanchez Ramirez Ravelo R E F L J D S; Freitas, P P

MgO Magnetic Tunnel Junction Electrical Current Sensor With Integrated Ru Thermal Sensor Journal Article

IEEE Trans. Magn, 49 (7), pp. 3866-3869, 2013.

Links | BibTeX

J. Amaral V. Pinto, Costa Gaspar Ferreira Paz Cardoso T J R E S; Freitas, P P

Integration of TMR Sensors in Silicon Microneedles for Magnetic Measurements of Neurons Journal Article

IEEE Trans. Magn, 49 (7), pp. 3515-3515, 2013.

Links | BibTeX

S. Cardoso L. Gameiro, Leitao Cardoso Ferreira Paz Freitas Schmid Aldavero D C F R E P P U J; LeesterSchaede, M

Magnetic tunnel junction sensors with pTesla sensitivity for biomedical imaging Journal Article

Smart Sensors, Actuators, and Mems, pp. 8763, 2013.

Links | BibTeX

F. Delgado K. Lopez, Ferreira R; Fernández-Rossier, J

Intrinsic Spin Noise in MgO Magnetic Tunnel Junctions Journal Article

Appl. Phys. Lett. , 102 (63102), 2013.

Links | BibTeX

2012

S. Arias D. Munoz, Moreno Cardoso Ferreira J S R; P. P. Freitas, Sensors

Fractional Modeling of the AC Large-Signal Frequency Response in Magnetoresistive Current Sensors Journal Article

Sensors, 13 (12), pp. 17516-17533, 2012.

Links | BibTeX

J. Ventura J. M. Teixeira, Paz J.S.Amaral J.D.Costa P.Araujo Cardoso Ferreira E J S R; P.P.Freitas,

The influence of annealing on the bimodal distribution of blocking temperatures of exchange biased bilayers Journal Article

Phys. Status Solidi RRL, 7 (9), pp. 676-680, 2012.

BibTeX

R. Ferreira E. Paz, Freitas Wang P P J; Xue, S

Large Area and Low Aspect Ratio Linear Magnetic Tunnel Junctions with a Soft-Pinned Sensing Layer Journal Article

IEEE Trans. Magn, 48 (11), pp. 3719, 2012.

Links | BibTeX

R. Ferreira E. Paz, Freitas Ribeiro Germano P P J J; Sousa, L

2-axis Magnetometers Based on Full Wheatstone Bridges Incorporating Magnetic Tunnel Junctions Connected in Series Journal Article

IEEE Trans. Magn, 48 (11), pp. 4107, 2012.

Links | BibTeX

J. Sanchez D. Ramirez, Ravelo Lopes Cardoso Ferreira S A S R; Freitas, P P

Electrical Characterization of a Magnetic Tunnel Junction Current Sensor for Industrial Applications Journal Article

IEEE Trans. Magn, 48 (11), pp. 2823, 2012.

Links | BibTeX

R. J. Janeiro L. Gameiro, Lopes Cardoso Ferreira Paz A S R E; Freitas, P P

Linearization and Field Detectivity in Magnetic Tunnel Junction Sensors Connected in Series Incorporating 16nm-thick NiFe Free Layers Journal Article

IEEE Trans. Magn, 48 (11), pp. 4111, 2012.

Links | BibTeX

GROUP LEADER

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THE TEAM

Elisabete Fernandes
Staff researcher

Hugo Oliveira
Staff researcher

Alexandre Chicharo
PhD student (IST)

Miguel Amaral
Master student (U Porto)

DESCRIPTION

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RESEARCH PROJECTS

Project INVENNTA II (in collaboration with the neuroscience group of J Castillo, at IDIS-H Universitario de Santiago de Compostela)

Team: INL ( Elizabete Fernandes, P.P.Freitas)

           IDIS, T Sobrino, J Castillo

          Other collaborators:  S Cardoso, and T.Dias at INESC MN, under subcontract, supplying MR chip technology

project 1

Platforms, PCBs, and magnetoresistive chips, being used for the multiplexed detection of ischemic stroke patient biomarkers

Conference presentation: Fernandes E., Martins V., Dias T., Germano J., Sobrino T., Cardoso S., Castillo J., Rivas J., Freitas PP. Simultaneous interrogation of multiple targets using a magnetoresistive (MR) biochip platform. Biosensors 2016, Gothenburg, Sweden 25-27 May 2016

Project INVENNTA II (in collaboration with the oncology group of R. Lopez, at IDIS-H Universitario de Santiago de Compostela)

Team: INL ( Alexandre Chicharo, P.P.Freitas, L Dieguez, B.Espina, M.Martins, J.Piteira)

            IDIS, R Lopez

            Other collaborators: S Cardoso at INESC MN, supplying MR cytometer chips

Cell labelled with magnetic beads

Cell labelled with magnetic beads


MR cytometer PCB, with integrated microfluidics and sensors

MR cytometer PCB, with integrated microfluidics and sensors

Conference presentation: A. Chícharo, M. Martins, B. Espiña, S. Cardoso and P. Freitas, High-throughput magnetic flow cytometer for tumour cell quantification, 13th Joint MMM-Intermag Conference, January 11-15, 2016, San Diego, California, US.

Exploiting spin transfer based nano-oscillators and spin Hall devices. Inl hosts one PhD student ( Mohammad Tarequzzaman) and has hosted one post doctoral fellow ( Bertrand Lacoste) with joint co-advising from Ricardo Ferreira (Spintronics), and P.Freitas. (more details in the spintronics group site).

This project is based on a COFUND fellowship holder ( Hongyan Bi) and addresses the specific, accurate, and fast quantification through optical means of compounds within a complex matrix background.

Schematic illustration of the microfluidic sensor integrated with after-channel UV/vis spectrophotometric detection for food ingredient analysis. (b) Collected absorbance change at 266 nm of solutions containing only caffeine, and mixture of AA and caffeine before (A0) and after (A) passing through the enzyme-loaded microfluidic sensor at 5 μL/min. Arrows indicate the time when it is started to sample the solution through the microfluidic channel.

Schematic illustration of the microfluidic sensor integrated with after-channel UV/vis spectrophotometric detection for food ingredient analysis. (b) Collected absorbance change at 266 nm of solutions containing only caffeine, and mixture of AA and caffeine before (A0) and after (A) passing through the enzyme-loaded microfluidic sensor at 5 μL/min. Arrows indicate the time when it is started to sample the solution through the microfluidic channel.

Publication: H. Bi, A. C. Fernandes, S. Cardoso and P. Freitas, Interference-Blind Microfluidic Sensor for Ascorbic Acid Determination by UV/vis Spectroscopy. Sensors and Actuators B: Chemical, 2016, 224, 668-675.

Starting project in collaboration with the Systems Engineering group, and external partners, to develop a fully integrated microspectrometer using CMOS based or a-Si:H based photodiodes, thin film multilayer band pass filters, and LEDS, into a compact format suitable for integration with control and communication hardware for a portable solution.

This project is being developed within the PhD thesis of M.Costa ( NanoFab). The goal is to incorporate magnetoresistive sensors with typical features of 100nm on the tip of AFM cantilevers, providing direct field mapping through an AFM probe.

Resonance characterization of the cantilever with a resonance frequency of ∼250 kHz. (b) Voltage output versus the external applied magnetic field response of an individualSV sensor already integrated in an AFM cantilever.

Resonance characterization of the cantilever with a resonance frequency of ∼250 kHz. (b) Voltage output versus the external applied magnetic field response of an individualSV sensor already integrated in an AFM cantilever.

Publication: “Integration of magnetoresistive sensors with atomic force microscopy cantilevers for scanning magnetoresistance microscopy applications”, M. Costa, J. Gaspar, R. Ferreira, E. Paz, H. Fonseca, M. Martins, S. Cardoso, and P. P. Freitas, IEEE Trans. Magnetics, vol. 51, no. 11, pp. 6503104, Nov. 2015

PUBLICATIONS

2016

H Bi A.C.Fernandes, S.Cardoso ; P.P.Freitas,

Interference-blind microfluidic sensor for ascorbic acid determination by UV/vis spectroscopy Journal Article

Sensors and Actuactos B, Chemical, 224 , pp. 668, 2016.

BibTeX

P.P.Freitas S.Cardoso, R.Ferreira

Spintronic Sensors Journal Article

Proceedings of IEEE , 104 (10), pp. 1894-1918, 2016.

BibTeX

T.J.Huisman Mikhaylovskiy, Costa R V ; J D

Femtosecond control of electric currents in metallic ferromagnetic heterostructures Journal Article

Nature Nanotechnology, 11 , pp. 455, 2016.

BibTeX

E.Paz R.Ferreira, P.P.Freitas

Linearization of magnetic sensors with a weakly-pinned free layer MTJ stack using a 3 step annealing process Journal Article

IEEE Transactions on Magnetics, 52 (7), 2016.

BibTeX

Vieira NCS ; Borme, J ; Machado G ; Cerqueira F ; Freitas PP  ; Zucolotto V; Peres NMR ; Alpuim J.Phys P 

Graphene field-effect transistor array with integrated electrolytic gates scaled to 200 mm Journal Article

Cond Matter, 28 , 2016.

Links | BibTeX

2015

A. Ravelo I. Sergio, Ramirez Cardoso Ferreira Freitas D S R P P

Total ionizing dose (TID) evaluation of magnetic tunnel junction (MTJ) current sensors Journal Article

Sensors and Actuators a-Physical, 225 (119-127), 2015.

BibTeX

J. Valadeiro J. Amaral, Leitao Ferreira Cardoso D C R S; Freitas, P P

Strategies for pTesla Field Detection Using Magnetoresistive Sensors With a Soft Pinned Sensing Layer Journal Article

IEEE Trans. Magn, 51 (1), pp. 4400204, 2015.

BibTeX

S. Sievers N. Liebing, Serrano-Guisan Ferreira Paz Caprile Manzin Pasquale Skowronski Stobiecki Rott Reiss Langer Ocker Schumacher S R E A A M W T K G J B H W

Toward Wafer Scale Inductive Characterization of Spin-Transfer Torque Critical Current Density of Magnetic Tunnel Junction Stacks Journal Article

IEEE Trans. Magn, 51 (1), pp. 1400804, 2015.

Links | BibTeX

A. Caprile A. Manzin, Coisson Pasquale Schumacher Liebing Sievers Ferreira Serrano-Guisan M M H W N S R S; Paz, E

Static and Dynamic Analysis of Magnetic Tunnel Junctions With Wedged MgO Barrier Journal Article

IEEE Trans. Magn, 51 (1), pp. 4400304, 2015.

Links | BibTeX

V. Silvérioa S. Cardosob, Gaspard Paulo Freitas Moreiraa J P A L N

Design, fabrication and test of an integrated multi-microchannel heat sink for electronics cooling Journal Article

Sensors and Actuactors A, Physical, 235 (14), pp. 235, 2015.

BibTeX

Costa J. D.; Serrano-Guisan, Borme S ; J

Impact of MgO Thickness on the Performance of Spin-Transfer Torque Nano-Oscillators Journal Article

Ieee Transactions on Magnetics , 51 (11), 2015.

BibTeX

M.Costa J.Gaspar, R.Ferreira E.Paz H.Fonseca M.Martins S.Cardoso P.P.Freitas

Integration of magnetoresistive sensors with atomic force microscopy cantilevers for scanning magnetoresistance microscopy applications Journal Article

IEEE Transactions on Magnetics, 51 , 2015.

BibTeX

A.V.Silva D.C.Leitao, J.Valadeiro J.Amaral P.P.Freitas Cardoso S

Linearization strategies for high sensitivity magnetoresistive sensors Journal Article

Eur. Phys. J. Appl. Phys., 72 , 2015.

BibTeX

D.Couto R. Sousa, Andrade Leander Lopez-Quintela J.Rivas P.P.Freitas M.Lima Porto B.Porto F.Carvalho Fernandes L M M A G E

Polyacrylic acid coated and non-coated iron-oxide nanoparticles are not genotoxic to human T-lymphocites Journal Article

Toxicology Letters, 234 (67), 2015.

BibTeX

2014

D. C. Leitao E. Paz, Silva Moskaltsova Knudde Deepak Ferreira Cardoso A A S F L R S; Freitas, P P

Nanoscale Magnetic Tunnel Junction Sensing Devices With Soft Pinned Sensing Layer and Low Aspect Ratio Journal Article

IEEE Trans. Magn, 50 (11), pp. 4410508, 2014.

Links | BibTeX

F. A. Cardoso L. S. Rosado, Franco Ferreira Paz Cardoso Ramos Piedade F R E S P M M; Freitas, P P

Improved Magnetic Tunnel Junctions Design for the Detection of Superficial Defects by Eddy Currents Testing Journal Article

IEEE Trans. Magn, 50 (11), pp. 6201304, 2014.

Links | BibTeX

X. Q. Bao R. Ferreira, Paz Leitao Silva Cardoso Freitas E D A S P P; F.Liu, L

Ordered arrays of tilted silicon nanobelts with enhanced solar hydrogen evolution performance Journal Article

Nanoscale, 6 , pp. 2097-2101, 2014.

BibTeX

S. Cardoso D. C. Leitao, Gameiro Cardoso Ferreira Paz L F R E; Freitas, P P

Magnetic tunnel junction sensors with pTesla sensitivity Journal Article

Microsyst. Technol., 20 , pp. 793-802, 2014.

BibTeX

Z. Hou A. Silva, Leitao Ferreira Cardoso D C R S; Freitas, P P

Micromagnetic and magneto-transport simulations of nanodevices based on MgO tunnel junctions for memory and sensing applications Journal Article

Physica B: Condensed Matter, 435 , pp. 163-167, 2014.

Links | BibTeX

D. W. Guo F. A. Cardoso, Ferreira Paz Cardoso R E S; Freitas, P P

MgO-based magnetic tunnel junction sensors array for non-destructive testing applications Journal Article

J. Appl. Phys., 115 , pp. 17E513, 2014.

Links | BibTeX

F. A. Cardoso L. Rosado, Ferreira Paz Cardoso Ramos Piedade R E S P M M; Freitas, P P

Magnetic tunnel junction based eddy current testing probe for detection of surface defects Journal Article

J. Appl. Phys., 115 (17), pp. 15E16, 2014.

Links | BibTeX

D. C. Leitao A. Silva, Ferreira Paz Deepack Cardoso R E F L S; Freitas, P P

Linear nanometric tunnel junction sensors with exchange pinned sensing layer Journal Article

J. App. Phys., 115 (17), pp. 17E526, 2014.

Links | BibTeX

2013

E. Paz S. Serrano-Guisan, Ferreira R; Freitas, P P

Room temperature direct detection of low frequency magnetic fields in the 100 pT/Hz(0.5) range using large arrays of magnetic tunnel junctions Journal Article

J. App. Phys., 115 (17), pp. 17E501, 2013.

Links | BibTeX

A. Silva D. Leitao, Huo Macedo Ferreira Paz Deepak Cardoso Z R R E F L S; Freitas, P P

Switching Field Variation in MgO Magnetic Tunnel Junction Nanopillars: Experimental Results and Micromagnetic Simulations Journal Article

IEEE Trans. Magn, 49 (7), pp. 4405-4408, 2013.

BibTeX

A. Lopes S. Cardoso, Ferreira Paz Deepak Sanchez Ramirez Ravelo R E F L J D S; Freitas, P P

MgO Magnetic Tunnel Junction Electrical Current Sensor With Integrated Ru Thermal Sensor Journal Article

IEEE Trans. Magn, 49 (7), pp. 3866-3869, 2013.

Links | BibTeX

J. Amaral V. Pinto, Costa Gaspar Ferreira Paz Cardoso T J R E S; Freitas, P P

Integration of TMR Sensors in Silicon Microneedles for Magnetic Measurements of Neurons Journal Article

IEEE Trans. Magn, 49 (7), pp. 3515-3515, 2013.

Links | BibTeX

S. Cardoso L. Gameiro, Leitao Cardoso Ferreira Paz Freitas Schmid Aldavero D C F R E P P U J; LeesterSchaede, M

Magnetic tunnel junction sensors with pTesla sensitivity for biomedical imaging Journal Article

Smart Sensors, Actuators, and Mems, pp. 8763, 2013.

Links | BibTeX

F. Delgado K. Lopez, Ferreira R; Fernández-Rossier, J

Intrinsic Spin Noise in MgO Magnetic Tunnel Junctions Journal Article

Appl. Phys. Lett. , 102 (63102), 2013.

Links | BibTeX

2012

S. Arias D. Munoz, Moreno Cardoso Ferreira J S R; P. P. Freitas, Sensors

Fractional Modeling of the AC Large-Signal Frequency Response in Magnetoresistive Current Sensors Journal Article

Sensors, 13 (12), pp. 17516-17533, 2012.

Links | BibTeX

J. Ventura J. M. Teixeira, Paz J.S.Amaral J.D.Costa P.Araujo Cardoso Ferreira E J S R; P.P.Freitas,

The influence of annealing on the bimodal distribution of blocking temperatures of exchange biased bilayers Journal Article

Phys. Status Solidi RRL, 7 (9), pp. 676-680, 2012.

BibTeX

R. Ferreira E. Paz, Freitas Wang P P J; Xue, S

Large Area and Low Aspect Ratio Linear Magnetic Tunnel Junctions with a Soft-Pinned Sensing Layer Journal Article

IEEE Trans. Magn, 48 (11), pp. 3719, 2012.

Links | BibTeX

R. Ferreira E. Paz, Freitas Ribeiro Germano P P J J; Sousa, L

2-axis Magnetometers Based on Full Wheatstone Bridges Incorporating Magnetic Tunnel Junctions Connected in Series Journal Article

IEEE Trans. Magn, 48 (11), pp. 4107, 2012.

Links | BibTeX

J. Sanchez D. Ramirez, Ravelo Lopes Cardoso Ferreira S A S R; Freitas, P P

Electrical Characterization of a Magnetic Tunnel Junction Current Sensor for Industrial Applications Journal Article

IEEE Trans. Magn, 48 (11), pp. 2823, 2012.

Links | BibTeX

R. J. Janeiro L. Gameiro, Lopes Cardoso Ferreira Paz A S R E; Freitas, P P

Linearization and Field Detectivity in Magnetic Tunnel Junction Sensors Connected in Series Incorporating 16nm-thick NiFe Free Layers Journal Article

IEEE Trans. Magn, 48 (11), pp. 4111, 2012.

Links | BibTeX

GROUP LEADER

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THE TEAM

Elisabete Fernandes
Staff researcher

Hugo Oliveira
Staff researcher

Alexandre Chicharo
PhD student (IST)

Miguel Amaral
Master student (U Porto)

RESEARCH

Nanoelectronics engineering
DEPARTMENTS
RESEARCH GROUPS
SystemsEngineerings
nanodevices
spintronics