Cab-nanoelectronics

Nanoelectronics Spintronics Research

The Spintronics Research Group at INL is focused on the production of devices exploring the large magnetoresistance effect of CoFeB/MgO/CoFeB Magnetic Tunnel Junctions.

The group’s research activity is developed around three pillars : Magnetic Tunnel Junctions Incorporating Perpendicular Magnetization Materials: including the integration of perpendicular polarizers on longitudinal magnetization MTJs, the production of fully perpendicular MTJs and perpendicular field sensing MTJs.

Integration of Magnetic Tunnel Junctions with standard CMOS: aiming the development of a nanofabrication process for sub-micron MTJs and the back-end process for the integration of MTJ pillars on standard CMOS circuits, including the high frequency electrical characterization and electrical model creation of the devices produced.

Magnetic Field Sensors and Devices: focused on the optimization of MTJ stacks and linearization methods for CoFeB/MgO/CoFeB MTJs optimized for HDD read head sensors, sub-micron resolution field sensors and general purpose low noise magnetic field sensors.

Spintronics research is supported by INL’s thin film deposition systems (SINGULUS TIMARIS MTM and KENOSISTEC 11 targets confocal PVD), micro and nanofabrication cleanroom facilities, advanced characterization facilities and two laboratories devoted to magnetometry and electrical characterization.

Publications:

2016
32) “Spin transfer driven resonant expulsion of a magnetic vortex core for efficient rf detector”, S. Menshawy,a, A.S. Jenkins, K.J. Merazzo, L. Vila, R. Ferreira, M.‐C. Cyrille,   U. Ebels, P. Bortolotti , J. Kermorvant , V. Cros,  arXiv:1610.08660 [physics.ins-det] (2016) | Link.

31) “Enhancing the injection locking range of spin torque oscillators through mutual coupling”, M. Romera, P. Talatchian, R. Lebrun, K. J. Merazzo, P. Bortolotti, L. Vila, J. D. Costa, R. Ferreira, P. P. Freitas, M.-C. Cyrille, U. Ebels, V. Cros, J. Grollier, cond-mat.mes-hall arXiv:1610.06172v1 (2016) | Link.

30) "Spintronic Sensors", Paulo P. Freitas, R. Ferreira, S. Cardoso, Proceedings of the IEEE, Vol. 104(10), pp. 1894 - 1918 (2016) | Link.

29) "Linearization of Magnetic Sensors With a Weakly Pinned Free-Layer MTJ Stack Using a Three-Step Annealing Process", E. Paz, R. Ferreira, and P. P. Freitas, IEEE Trans. Magn., Vol. 52(7), pp. 4002104 (2016) | Link.

28)  “AlOx barrier growth in magnetic tunnel junctions for sensor applications”, S. Knudde, G. Farinha, D. C. Leitao, R. Ferreira, S. Cardoso, P. P. Freitas, Journal of Magnetism and Magnetic Materials, vol  412, pp 181–184 (2016) | Link.
 
27) “Magnetoresistive nanosensors: controlling magnetism at the nanoscale”, D. C. Leitao, A. V. Silva, E. Paz, R. Ferreira, S. Cardoso and P. P. Freitas,  NanotechnologyVolume 27Number 4, pp 045501 (2016) | Link.

2015

26) “Impact of MgO Thickness on the Performance of Spin-Transfer Torque Nano-Oscillators”, J. D. Costa, S. Serrano-Guisan,, J. Borme, F. L. Deepak, M. Tarequzzaman, E. Paz, J. Ventura, R. Ferreira, and P. P. Freitas, IEEE Trans Magn,  Vol. 51,  Issue 11, pp 1401604 (2015) | Link.
 
25) “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 Magn, vol 51, issue 11, pp 6503104 (2015) | Link.

24) "Static and Dynamic Analysis of Magnetic Tunnel Junctions With Wedged MgO Barrier", A. Caprile, A. Manzin, M. Coisson, M. Pasquale, H. W. Schumacher, N. Liebing, S. Sievers, R. Ferreira, S. Serrano-Guisan, and E, Paz, IEEE Trans. Magn., 51(1), p4400304, (2015) | Link.

23) "Total ionizing dose (TID) evaluation of magnetic tunnel junction (MTJ) current sensors", A. Ravelo, I. Sergio, D. Ramirez, S. Cardoso, R. Ferreira, P. P. Freitas, Sensors and Actuators a-Physical, 225, p119-127, (2015) | Link.

22) "Toward Wafer Scale Inductive Characterization of Spin-Transfer Torque Critical Current Density of Magnetic Tunnel Junction Stacks", S. Sievers, N. Liebing, S. Serrano-Guisan, R. Ferreira, E. Paz, A. Caprile, A. Manzin, M. Pasquale, W. Skowronski, T. Stobiecki, K. Rott, G. Reiss, J. Langer, B. Ocker, H. W. Schumacher, IEEE Trans. Magn., 51(1), p1400804, (2015) | link.

21) "Strategies for pTesla Field Detection Using Magnetoresistive Sensors With a Soft Pinned Sensing Layer", J. Valadeiro, J. Amaral, D. C. Leitao, R. Ferreira, S. Cardoso and P. P. Freitas, IEEE Trans. Magn., 51(1), p4400204, (2015) | link.

2014

20) "Ordered arrays of tilted silicon nanobelts with enhanced solar hydrogen evolution performance", X. Q. Bao, R. Ferreira, E. Paz, D. Leitao, A. Silva, S. Cardoso, P.P. Freitas and L. F.Liu, Nanoscale, 6, p2097-2101, (2014) | link.

19) "Magnetic tunnel junction based eddy current testing probe for detection of surface defects", F. A. Cardoso, L. Rosado, R. Ferreira, E. Paz, S. Cardoso, P. M. Ramos, M.  Piedade and P. P. Freitas, J. Appl. Phys., 115(17), p17E516, (2014) | link.

18) "Improved Magnetic Tunnel Junctions Design for the Detection of Superficial Defects by Eddy Currents Testing", F. A. Cardoso, L. S. Rosado, F. Franco, R. Ferreira, E. Paz, S. Cardoso, P. M. Ramos, M. Piedade and P. P. Freitas, IEEE Trans. Magn., 50(11), p6201304, (2014) | link.

17) "Magnetic tunnel junction sensors with pTesla sensitivity", S. Cardoso, D. C. Leitao, L. Gameiro, F. Cardoso, R. Ferreira, E. Paz and P. P. Freitas, Microsyst. Technol., 20, p793-802, (2014) | link.

16) "MgO-based magnetic tunnel junction sensors array for non-destructive testing applications", D. W. Guo, F. A. Cardoso, R. Ferreira, E. Paz, S. Cardoso and P. P. Freitas, J. Appl. Phys.,  115, p17E513 (2014) | link.

15) "Micromagnetic and magneto-transport simulations of nanodevices based on MgO tunnel junctions for memory and sensing applications", Z. Hou, A. Silva, D. C. Leitao, R. Ferreira, S. Cardoso and P. P. Freitas, Physica B: Condensed Matter, 435, p163-167, (2014) | link.

14) "Linear nanometric tunnel junction sensors with exchange pinned sensing layer", D. C. Leitao, A. Silva, R. Ferreira, E. Paz, F. L. Deepack, S. Cardoso and P. P. Freitas, J. App. Phys., 115(17), p17E526, (2014) | link.

13) "Nanoscale Magnetic Tunnel Junction Sensing Devices With Soft Pinned Sensing Layer and Low Aspect Ratio", D. C. Leitao, E. Paz, A. Silva, A. Moskaltsova, S. Knudde, F. L. Deepak, R. Ferreira, S. Cardoso and P. P. Freitas, IEEE Trans. Magn., 50(11), p4410508, (2014) | link.

12) "Room temperature direct detection of low frequency magnetic fields in the 100 pT/Hz(0.5) range using large arrays of magnetic tunnel junctions", E. Paz, S. Serrano-Guisan, R. Ferreira and P. P. Freitas, J. App. Phys., 115(17), p17E501, (2014) | link.

2013

11) "Integration of TMR Sensors in Silicon Microneedles for Magnetic Measurements of Neurons", J. Amaral, V. Pinto, T. Costa, J. Gaspar, R. Ferreira, E. Paz, S. Cardoso and P. P. Freitas, IEEE Trans. Magn., 49(7), p3512-3515, (2013) | link.

10) "Fractional Modeling of the AC Large-Signal Frequency Response in Magnetoresistive Current Sensors", S. Arias, D. Munoz, J. Moreno, S. Cardoso, R. Ferreira and P. P. Freitas, Sensors, 13(12), p17516-17533, (2013) | link.

09) "Magnetic tunnel junction sensors with pTesla sensitivity for biomedical imaging", S. Cardoso, L. Gameiro, D. C. Leitao, F. Cardoso, R. Ferreira, E. Paz, P. P. Freitas, U. Schmid, J. Aldavero and M. LeesterSchaedel, Smart Sensors, Actuators, and Mems, 8763, (2013) | link.

08) "MgO Magnetic Tunnel Junction Electrical Current Sensor With Integrated Ru Thermal Sensor", A. Lopes, S. Cardoso, R. Ferreira, E. Paz, F. L. Deepak, J. Sanchez, D. Ramirez, S. Ravelo, and P. P. Freitas, IEEE Trans. Magn., 49(7), p3866-3869, (2013) | link.

07) "Switching Field Variation in MgO Magnetic Tunnel Junction Nanopillars: Experimental Results and Micromagnetic Simulations", A. Silva, D. Leitao, Z. Huo, R. Macedo, R. Ferreira,E. Paz, F. L. Deepak, S. Cardoso and P. P. Freitas, IEEE Trans. Magn., 49(7), p4405-4408, (2013) | link.

06) "Intrinsic Spin Noise in MgO Magnetic Tunnel Junctions”, F. Delgado, K. Lopez, R. Ferreira and J. Fernández-Rossier, Appl. Phys. Lett., vol 102, p 063102 (2013) | link.

2012

05) "The influence of annealing on the bimodal distribution of blocking temperatures of exchange biased bilayers”, J. Ventura, J. M. Teixeira, E. Paz, J.S.Amaral, J.D.Costa, J. P.Araujo, S. Cardoso, R. Ferreira, and P.P.Freitas,  Phys. Status Solidi RRL, 7(9), p676-680, (2012) | link.

04) "Linearization and Field Detectivity in Magnetic Tunnel Junction Sensors Connected in Series Incorporating 16nm-thick NiFe Free Layers”, R. J. Janeiro, L. Gameiro, A. Lopes, S. Cardoso, R. Ferreira, E. Paz and P. P. Freitas , IEEE Trans. Magn., 48(11), p4111 (2012) | link.

03) "Electrical Characterization of a Magnetic Tunnel Junction Current Sensor for Industrial Applications”, J. Sanchez, D. Ramirez, S. Ravelo, A. Lopes, S. Cardoso, R. Ferreira and P. P. Freitas,  IEEE Trans. Magn., 48(11), p2823 (2012) | link.

02) "2-axis Magnetometers Based on Full Wheatstone Bridges Incorporating Magnetic Tunnel Junctions Connected in Series”, R. Ferreira, E. Paz, P. P. Freitas, J. Ribeiro, J. Germano and L. Sousa, IEEE Trans. Magn., 48(11), p 4107 (2012) | link.

01) "Large Area and Low Aspect Ratio Linear Magnetic Tunnel Junctions with a Soft-Pinned Sensing Layer”, R. Ferreira, E. Paz, P. P. Freitas, J. Wang and S. Xue, IEEE Trans. Magn., vol 48, issue 11, p 3719 (2012) | link.

Team

Group manager Ricardo Ferreira

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