Danijela Markovic and Nathan Leroux and Alice Mizrahi and Juan Trastoy and Vincent Cros and Paolo Bortolotti and Leandro Martins and Alex Jenkins and Ricardo Ferreira and Julie Grollier Detection of the Microwave Emission from a Spin-Torque Oscillator by a Spin Diode Journal Article Phys. Rev. Applied, 13 , pp. 044050, 2020. Links | BibTeX @article{PhysRevApplied.13.044050,
title = {Detection of the Microwave Emission from a Spin-Torque Oscillator by a Spin Diode},
author = {Danijela Markovic and Nathan Leroux and Alice Mizrahi and Juan Trastoy and Vincent Cros and Paolo Bortolotti and Leandro Martins and Alex Jenkins and Ricardo Ferreira and Julie Grollier},
url = {https://link.aps.org/doi/10.1103/PhysRevApplied.13.044050},
doi = {10.1103/PhysRevApplied.13.044050},
year = {2020},
date = {2020-04-01},
journal = {Phys. Rev. Applied},
volume = {13},
pages = {044050},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Alex S Jenkins and Lara San Emeterio Alvarez and Roberta Dutra and Ruben L Sommer and Paulo P Freitas and Ricardo Ferreira Wideband High-Resolution Frequency-to-Resistance Converter Based on Nonhomogeneous Magnetic-State Transitions Journal Article Phys. Rev. Applied, 13 , pp. 014046, 2020. Links | BibTeX @article{PhysRevApplied.13.014046,
title = {Wideband High-Resolution Frequency-to-Resistance Converter Based on Nonhomogeneous Magnetic-State Transitions},
author = {Alex S Jenkins and Lara San Emeterio Alvarez and Roberta Dutra and Ruben L Sommer and Paulo P Freitas and Ricardo Ferreira},
url = {https://link.aps.org/doi/10.1103/PhysRevApplied.13.014046},
doi = {10.1103/PhysRevApplied.13.014046},
year = {2020},
date = {2020-01-01},
journal = {Phys. Rev. Applied},
volume = {13},
pages = {014046},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
H Farkhani and T Bohnert and M Tarequzzaman and D Costa and A Jenkins and R Ferreira and F Moradi Spin-Torque-Nano-Oscillator based neuromorphic computing assisted by laser Inproceedings 2019 14th International Conference on Design & Technology of Integrated Systems In Nanoscale Era (DTIS), IEEE, 2019. Links | BibTeX @inproceedings{Farkhani2019,
title = {Spin-Torque-Nano-Oscillator based neuromorphic computing assisted by laser},
author = {H Farkhani and T Bohnert and M Tarequzzaman and D Costa and A Jenkins and R Ferreira and F Moradi},
doi = {10.1109/dtis.2019.8734967},
year = {2019},
date = {2019-04-01},
booktitle = {2019 14th International Conference on Design & Technology of Integrated Systems In Nanoscale Era (DTIS)},
publisher = {IEEE},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
M Tarequzzaman and T Böhnert and M Decker and J D Costa and J Borme and B Lacoste and E Paz and A S Jenkins and S Serrano-Guisan and C H Back and R Ferreira and P P Freitas Spin torque nano-oscillator driven by combined spin injection from tunneling and spin Hall current Journal Article Communications Physics, 2 (1), pp. 20, 2019, ISSN: 2399-3650. Abstract | Links | BibTeX @article{Tarequzzaman2019,
title = {Spin torque nano-oscillator driven by combined spin injection from tunneling and spin Hall current},
author = {M Tarequzzaman and T Böhnert and M Decker and J D Costa and J Borme and B Lacoste and E Paz and A S Jenkins and S Serrano-Guisan and C H Back and R Ferreira and P P Freitas},
url = {https://doi.org/10.1038/s42005-019-0119-7},
doi = {https://doi.org/10.1038/s42005-019-0119-7},
issn = {2399-3650},
year = {2019},
date = {2019-01-01},
journal = {Communications Physics},
volume = {2},
number = {1},
pages = {20},
abstract = {Spin-transfer torque nano-oscillators (STNO) are important candidates for several applications based on ultra-tunable microwave generation and detection. The microwave dynamics in these STNOs are induced by spin currents that are typically generated either by spin polarization in an adjacent ferromagnetic layer or through the spin Hall effect. In this paper, a 3-terminal STNO based on a magnetic tunnel junction is excited by both of these spin injection mechanisms. The combination of these two mechanisms excites the free layer into dynamic regimes beyond what can be achieved by each excitation mechanism individually, resulting in enhanced output powers, a key figures of merit for device performance. The system response can be coherently quantified as a function of the total injected spin current density. The experimental data shows an excellent consistency with this simple model and a critical spin current density of 4.52±0.18×10^9 h_bar/2 e^-1 Am^-2.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Spin-transfer torque nano-oscillators (STNO) are important candidates for several applications based on ultra-tunable microwave generation and detection. The microwave dynamics in these STNOs are induced by spin currents that are typically generated either by spin polarization in an adjacent ferromagnetic layer or through the spin Hall effect. In this paper, a 3-terminal STNO based on a magnetic tunnel junction is excited by both of these spin injection mechanisms. The combination of these two mechanisms excites the free layer into dynamic regimes beyond what can be achieved by each excitation mechanism individually, resulting in enhanced output powers, a key figures of merit for device performance. The system response can be coherently quantified as a function of the total injected spin current density. The experimental data shows an excellent consistency with this simple model and a critical spin current density of 4.52±0.18×10^9 h_bar/2 e^-1 Am^-2. |
Hooman Farkhani and Tim Böhnert and Mohammad Tarequzzaman and José Diogo Costa and Alex Jenkins and Ricardo Ferreira and Jens Kargaard Madsen and Farshad Moradi LAO-NCS: Laser Assisted Spin Torque Nano Oscillator-Based Neuromorphic Computing System Journal Article Frontiers in Neuroscience, 13 , 2019. Links | BibTeX @article{farkhani2019lao,
title = {LAO-NCS: Laser Assisted Spin Torque Nano Oscillator-Based Neuromorphic Computing System},
author = {Hooman Farkhani and Tim Böhnert and Mohammad Tarequzzaman and José Diogo Costa and Alex Jenkins and Ricardo Ferreira and Jens Kargaard Madsen and Farshad Moradi},
url = {https://doi.org/10.3389/fnins.2019.01429},
doi = {10.3389/fnins.2019.01429},
year = {2019},
date = {2019-01-01},
journal = {Frontiers in Neuroscience},
volume = {13},
publisher = {Frontiers Media SA},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Sheng Jiang and Martina Ahlberg and Sunjae Chung and A Houshang and R Ferreira and PP Freitas and Johan Åkerman Magnetodynamics in orthogonal nanocontact spin-torque nano-oscillators based on magnetic tunnel junctions Journal Article Applied Physics Letters, 115 (15), pp. 152402, 2019. Links | BibTeX @article{jiang2019magnetodynamics,
title = {Magnetodynamics in orthogonal nanocontact spin-torque nano-oscillators based on magnetic tunnel junctions},
author = {Sheng Jiang and Martina Ahlberg and Sunjae Chung and A Houshang and R Ferreira and PP Freitas and Johan Åkerman},
url = {https://doi.org/10.1063/1.5121356},
doi = {10.1063/1.5121356},
year = {2019},
date = {2019-01-01},
journal = {Applied Physics Letters},
volume = {115},
number = {15},
pages = {152402},
publisher = {AIP Publishing LLC},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Alex S Jenkins and Lara San Emeterio Alvarez and Paulo P Freitas and Ricardo Ferreira Nanoscale true random bit generator based on magnetic state transitions in magnetic tunnel junctions Journal Article Scientific reports, 9 (1), pp. 1–6, 2019. Links | BibTeX @article{jenkins2019nanoscale,
title = {Nanoscale true random bit generator based on magnetic state transitions in magnetic tunnel junctions},
author = {Alex S Jenkins and Lara San Emeterio Alvarez and Paulo P Freitas and Ricardo Ferreira},
url = {https://doi.org/10.1038/s41598-019-52236-z},
doi = {10.1038/s41598-019-52236-z},
year = {2019},
date = {2019-01-01},
journal = {Scientific reports},
volume = {9},
number = {1},
pages = {1--6},
publisher = {Nature Publishing Group},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Hooman Farkhani and Tim Böhnert and Mohammad Tarequzzaman and Diogo Costa and Alex Jenkins and Ricardo Ferreira and Farshad Moradi Spin-Torque-Nano-Oscillator based neuromorphic computing assisted by laser Inproceedings 2019 14th International Conference on Design & Technology of Integrated Systems In Nanoscale Era (DTIS), pp. 1–5, IEEE 2019. Links | BibTeX @inproceedings{farkhani2019spin,
title = {Spin-Torque-Nano-Oscillator based neuromorphic computing assisted by laser},
author = {Hooman Farkhani and Tim Böhnert and Mohammad Tarequzzaman and Diogo Costa and Alex Jenkins and Ricardo Ferreira and Farshad Moradi},
url = {https://doi.org/10.1109/DTIS.2019.8734967},
doi = {10.1109/DTIS.2019.8734967},
year = {2019},
date = {2019-01-01},
booktitle = {2019 14th International Conference on Design & Technology of Integrated Systems In Nanoscale Era (DTIS)},
pages = {1--5},
organization = {IEEE},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
M Tarequzzaman and A S Jenkins and T Böhnert and J Borme and L Martins and E Paz and R Ferreira and P P Freitas Broadband voltage rectifier induced by linear bias dependence in CoFeB/MgO magnetic tunnel junctions Journal Article Applied Physics Letters, 112 (25), pp. 252401, 2018, (arXiv: 1804.04104). Abstract | Links | BibTeX @article{Tarequzzaman2018ab,
title = {Broadband voltage rectifier induced by linear bias dependence in CoFeB/MgO magnetic tunnel junctions},
author = {M Tarequzzaman and A S Jenkins and T Böhnert and J Borme and L Martins and E Paz and R Ferreira and P P Freitas},
url = {https://doi.org/10.1063/1.5029363},
doi = {10.1063/1.5029363},
year = {2018},
date = {2018-06-01},
urldate = {2018-04-13},
journal = {Applied Physics Letters},
volume = {112},
number = {25},
pages = {252401},
abstract = {In this paper, the perpendicular magnetic anisotropy (PMA) is tailored by changing the thickness of the free layer with the objective of producing MTJ nano-pillars with smooth linear resistance dependence with both in-plane magnetic field and DC bias. We furthermore demonstrate how this linear bias dependence can be used to create a zero-threshold broadband voltage rectifier, a feature which is important for rectification in wireless charging and energy harvesting applications. By carefully balancing the amount of PMA acting in the free layer the measured RF to DC voltage conversion efficiency can be made as large as 11%.},
note = {arXiv: 1804.04104},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this paper, the perpendicular magnetic anisotropy (PMA) is tailored by changing the thickness of the free layer with the objective of producing MTJ nano-pillars with smooth linear resistance dependence with both in-plane magnetic field and DC bias. We furthermore demonstrate how this linear bias dependence can be used to create a zero-threshold broadband voltage rectifier, a feature which is important for rectification in wireless charging and energy harvesting applications. By carefully balancing the amount of PMA acting in the free layer the measured RF to DC voltage conversion efficiency can be made as large as 11%. |
M Tarequzzaman and T Bohnert and A S Jenkins and J Borme and E Paz and R Ferreira and P P Freitas Influence of MgO Tunnel Barrier Thickness on the Output Power of Three-Terminal Spin Hall Nano-Oscillators Journal Article IEEE Transactions on Magnetics, pp. 1–4, 2018. Links | BibTeX @article{Tarequzzaman2018b,
title = {Influence of MgO Tunnel Barrier Thickness on the Output Power of Three-Terminal Spin Hall Nano-Oscillators},
author = {M Tarequzzaman and T Bohnert and A S Jenkins and J Borme and E Paz and R Ferreira and P P Freitas},
doi = {10.1109/tmag.2018.2831242},
year = {2018},
date = {2018-01-01},
journal = {IEEE Transactions on Magnetics},
pages = {1--4},
publisher = {Institute of Electrical and Electronics Engineers (IEEE)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
J D Costa and S Serrano-Guisan and B Lacoste and A S Jenkins and T Böhnert and M Tarequzzaman and J Borme and F L Deepak and E Paz and J Ventura and R Ferreira and P P Freitas High power and low critical current density spin transfer torque nano-oscillators using MgO barriers with intermediate thickness Journal Article Scientific Reports, 7 (1), 2017. Links | BibTeX @article{Costa2017,
title = {High power and low critical current density spin transfer torque nano-oscillators using MgO barriers with intermediate thickness},
author = {J D Costa and S Serrano-Guisan and B Lacoste and A S Jenkins and T Böhnert and M Tarequzzaman and J Borme and F L Deepak and E Paz and J Ventura and R Ferreira and P P Freitas},
url = {https://www.nature.com/articles/s41598-017-07762-z},
doi = {10.1038/s41598-017-07762-z},
year = {2017},
date = {2017-08-01},
journal = {Scientific Reports},
volume = {7},
number = {1},
publisher = {Springer Nature},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
J D Costa and S Serrano-Guisan and J Borme and F L Deepak and M Tarequzzaman and E Paz and J Ventura and R Ferreira and P P Freitas Impact of MgO Thickness on the Performance of Spin-Transfer Torque Nano-Oscillators Journal Article IEEE Transactions on Magnetics , 51 (11), 2015. Links | BibTeX @article{Costa2015,
title = {Impact of MgO Thickness on the Performance of Spin-Transfer Torque Nano-Oscillators},
author = {J D Costa and S Serrano-Guisan and J Borme and F L Deepak and M Tarequzzaman and E Paz and J Ventura and R Ferreira and P P Freitas},
url = {ieeexplore.ieee.org/document/7117429/},
doi = {10.1109/TMAG.2015.2441141},
year = {2015},
date = {2015-01-01},
journal = {IEEE Transactions on Magnetics },
volume = {51},
number = {11},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
JRP SpinCal project partners Physikalisch-Technischen Bundesanstalt (PTB), Germany; National Physical Laboratory (NPL), UK; Istituto Nazionale di Recerca Metrologica (INRIM), Italy; University of Bielefeld, Germany; Cambridge University, UK;International Iberian Nanotechnology Laboratory (INL), Portugal; Institute of Physics of Czech Republic (FZU), Czech Republic.
