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.
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.