Spin-Caloritronics

spin-charge-heat triangle
Spin-caloritronics is a new research field combining Spintronics (spin transport electronics) and Thermoelectricity (heat transport electronics) in magnetic nanostructured systems. At such a scale, thermal gradients can play an active role to control and manipulate spin-based effects enabling the generation of thermally induced spin currents or even thermally driven magnetization reversal.

  • We investigate thermovoltages in the nanometer-thin films of the MTJ,
  • use thermovoltage measurements as an methode to probe the temperature behavior,
  • and quantifies how thermal currents excite oscillation via the thermal STT in vortex oscillators.

This approach is based on recently observed large tunneling magneto Seebeck ratios in magnetic tunnel junction (MTJ) structures, suggesting the potentiality of such devices, not only for magnetic random access memory (MRAM) devices or Spin Transfer Torque Nano-oscillators (STNOs), but also for on-chip energy harvesting applications. On the other hand, we believe that the exploration of heat driven magnetization dynamics could enable a better comprehension of Spin Transfer Torque (STT) magnetization dynamic phenomena in MTJ nanodevices and the contribution of heat, charge and spin currents at such conditions.

SPINTRONICSSPINCALJRP 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.

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

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.

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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.

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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

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.

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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.

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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.

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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

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

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.

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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.

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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.

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