Role of damping in spin Seebeck effect in yttrium iron garnet thin films

Abstract

We report an experimental study on how the spin Seebeck effect in magnetic insulators depends on damping.

Role of gallium diffusion in the formation of a magnetically dead layer at the Y3Fe5O12/Gd3Ga5Korovin1, Bursian2, Lutsev3 et al. 2018Phys. Rev. Materials442130View full textAdd to dashboardCite

“…A gallium signature was also reported in Ref. [25], where YIG layers of 20 nm thickness were grown on GGG (111) by magnetron sputtering at room temperature followed by a few hours of annealing in oxygen at 800°C. The XPS spectra presented in Ref.…”

“…The XPS spectra presented in Ref. [25] show noticeable traces of Ga (both Auger and PE peaks) that are, however, claimed by the authors to come from the GGG substrate. This is arguable as the photoelectrons excited in the GGG substrate are not supposed to be able to escape through a 20 nm thick YIG film.…”

“…In mixed valence compounds such as Fe 3 O 4 , the satellite is usually not prominent due to the superposition of Fe 2+ and Fe 3+ associated satellites. In XPS studies related to thick YIG films, the 3+ satellite is usually observed [7,25,29,31], indicating the domination of Fe 3+ . In the Fe 2p spectra shown in Fig.…”

Anomalous Nernst effect in Ir22Mn78/Co20Fe60B20/MgO layers with perpendicular magnetic anisotropy

“…21 A typical setup, utilizing an out-of-plane temperature gradient and an in-plane magnetic field, has been used to investigate the ANE in previous works. [22][23][24][25][26] The trouble with this configuration is that, in addition to generating an ANE voltage, the out-of-plane temperature gradient can also generate a spin current through the so-called longitudinal spin Seebeck effect (LSSE), 22,[27][28][29][30][31][32][33] which flows directly from the ferromagnetic (FM) into the adjacent non-magnetic metal (NM) and generates a voltage because of the inverse spin Hall effect (ISHE). In order to distinguish the spin Seebeck effect (SSE) and ANE, extensive efforts [34][35][36][37] have been made to compare the voltage in different temperature gradient configurations.…”

Recent Trends in Microwave Magnetism and Superconductivity

“…Even the amplification of propagating dipolar magnons by a thermal spin-transfer torque created by spin currents, which are generated through the spin Seebeck effect (SSE), was reported [158]. Recently, the role of a damping in the spin Seebeck effect in yttrium iron garnet thin films was studied experimentally [159]. It was demonstrated that a decrease in the intrinsic damping of the magnetic material gives rise to an increase in the SSE coefficient, and this response also shows a quasilinear behavior.…”