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.

Yang, H F; Hu, X K; Sievers, S; Bohnert, T; Costa, J D; Tarequzzaman, M; Ferreira, R; Bieler, M; Schumacher, H W

Coherent Control of Acoustic-Wave-Induced Magnetization Dynamics in Magnetic Tunnel Junctions Inproceedings

2018 Conference on Precision Electromagnetic Measurements, IEEE, 2018.

Links | BibTeX

Böhnert, T; Paz, E; Ferreira, R; Freitas, P P

Magnetic tunnel junction thermocouple for thermoelectric power harvesting Journal Article

Physics Letters A, 2018, ISSN: 0375-9601.

Links | BibTeX

Böhnert, T; Serrano-Guisan, S; Paz, E; Lacoste, B; Ferreira, R; Freitas, P P

Magnetic tunnel junctions with integrated thermometers for magnetothermopower measurements Journal Article

Journal of Physics: Condensed Matter, 29 (18), pp. 185303, 2017.

Abstract | Links | BibTeX

Kuepferling, M; Garcia-Sanchez, F; Böhnert, T; Ferreira, R; Dutra, R; Sommer, R L; Pasquale, M

Influence of thermal gradients on the vortex dynamics in CoFeB MTJs Inproceedings

2017 IEEE International Magnetics Conference (INTERMAG), pp. 1-1, 2017.

Abstract | Links | BibTeX

Böhnert, T; Dutra, R; Sommer, R L; Paz, E; Serrano-Guisan, S; Ferreira, R; Freitas, P P

Influence of the thermal interface resistance on the thermovoltage of a magnetic tunnel junction Journal Article

Physical Review B, 95 , pp. 104441, 2017.

Links | BibTeX

Yang, H F; Hu, X K; Liebing, N; Böhnert, T; Costa, J D; Tarequzzaman, M; Ferreira, R; Sievers, S; Bieler, M; Schumacher, H W

Electrical measurement of absolute temperature and temperature transients in a buried nanostructure under ultrafast optical heating Journal Article

Applied Physics Letters, 110 (23), pp. 232403, 2017.

Links | BibTeX

Liebing, N; Serrano-Guisan, S; Krzysteczko, P; Rott, K; Reiss, G; Langer, J; Ocker, B; Schumacher, H W

Tunneling magneto thermocurrent in CoFeB/MgO/CoFeB based magnetic tunnel junctions Journal Article

Applied Physics Letters, 102 (24), pp. 242413, 2013.

Links | BibTeX

back to Spintronics