Open AccessSignature of spin-dependent Seebeck effect in dynamical spin injection of metallic bilayer structures
Author(s) -
Kazuto Yamanoi,
Minoru Yafuso,
Kôji Miyazaki,
Takashi Kimura
Publication year - 2019
Publication title -
jphys materials
Language(s) - English
Resource type - Journals
ISSN - 2515-7639
DOI - 10.1088/2515-7639/ab45cc
Subject(s) - condensed matter physics , paramagnetism , spin hall effect , bilayer , spin (aerodynamics) , materials science , ferromagnetism , hall effect , seebeck coefficient , thermoelectric effect , spin pumping , electrical resistivity and conductivity , spin polarization , thermal conductivity , physics , chemistry , electron , thermodynamics , membrane , composite material , biochemistry , quantum mechanics
The dynamical spin injection in a ferromagnetic/paramagnetic bilayer with various paramagnetic layers has been examined by using the inverse spin Hall effect. We adapt a CoFeB film as a ferromagnetic layer, which has a large spin dependent Seebeck coefficient. The contribution of the spin pumping was evaluated from the line-width change of the ferromagnetic resonant spectra while that of the thermal spin injection was evaluated from the heat conductivity for the paramagnetic layer. We find that the spin Hall voltage does not show the systematic change with respect to the line-width change. However, the normalized spin Hall voltage is found to increase with the heat conductivity for the paramagnetic layer. These results suggest that the thermal spin injection is a major contribution for the dynamical spin injection in CoFeB/paramagnetic bilayer systems.