2014/02/19 by David Luc, Xavier Waintal · 3 citations
Engineering · Physics and Astronomy · #Advanced Memory and Neural Computing #Amplitude #Asymmetry #Condensed matter physics #Magnetic field #Magnetic properties of thin films #Physics #Precession #Quantum and electron transport phenomena #Quantum mechanics #Semiclassical physics #Spin (aerodynamics) #Thermodynamics #Torque #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.90.144430
published in Physical Review B 90(14) (American Physical Society) · 5 pages + 3 pages supplementary material, 3 figures
arxiv created 2014/02/19 · openalex publication_date 2014/10/24 · arxiv updated 2014/10/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We investigate the angular dependence of the spin torque generated when applying a temperature difference across a spin valve. Our study shows the presence of a nontrivial fixed point in this angular dependence. This fixed point opens the possibility for a temperature gradient to stabilize radio frequency oscillations without the need for an external magnetic field. This so-called ``wavy'' behavior can already be found upon applying a voltage difference across a spin valve but we find that this effect is much more pronounced with a temperature difference. We find that a spin asymmetry of the Seebeck coefficient of the order of 20\phantom\rule0.28em0ex\ensuremathμV\phantom\rule0.16em0exK^\ensuremath-1 should be large enough for a temperature gradient of a few degrees to trigger the radio-frequency oscillations. Our semiclassical theory is fully parametrized with experimentally measured(able) parameters and allows one to quantitatively predict the amplitude of the torque.