TY - JOUR
T1 - Generalized Spin Drift-Diffusion Formalism in the Presence of Spin-Orbit Interaction of Ferromagnets
AU - Kim, Kyoung Whan
AU - Lee, Kyung Jin
N1 - Funding Information:
The authors acknowledges H.-W. Lee, S. Han, D.-S. Han, P. M. Haney, M. Stiles, V. Amin, B.-C. Min, S.-K. Kim, G. Go, D. Go, C.-Y. You, and N. Park for fruitful discussion. This work was supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (2020R1C1C1012664, 2019M3F3A1A02071509, 2020R1A2C3013302), the KIST Institutional Programs (2E30600, 2V05750), and the National Research Council of Science and Technology (NST) (CAP-16-01-KIST).
PY - 2020/11/13
Y1 - 2020/11/13
N2 - We generalize the spin drift-diffusion formalism by considering spin-orbit interaction of a ferromagnet, which generates transverse spin currents in the ferromagnet. We consider quantum-mechanical transport of transverse spins in a spin-orbit coupled ferromagnet and develop a generalized drift-diffusion equation and boundary condition. By combining them, we identify previously unrecognized spin transport phenomena in heterostructures including ferromagnets. As representative examples, we show self-generated spin torque and self-generated charge pumping in ferromagnet-normal metal bilayers. The former is a torque exerting on a ferromagnet, originating from a transverse spin current leaving from the ferromagnet itself, whereas the latter is the Onsager reciprocity of the former. Our work not only provides a concise formalism for the effects of nondephased transverse spins in ferromagnets but also enables to design spintronic devices without an external spin source.
AB - We generalize the spin drift-diffusion formalism by considering spin-orbit interaction of a ferromagnet, which generates transverse spin currents in the ferromagnet. We consider quantum-mechanical transport of transverse spins in a spin-orbit coupled ferromagnet and develop a generalized drift-diffusion equation and boundary condition. By combining them, we identify previously unrecognized spin transport phenomena in heterostructures including ferromagnets. As representative examples, we show self-generated spin torque and self-generated charge pumping in ferromagnet-normal metal bilayers. The former is a torque exerting on a ferromagnet, originating from a transverse spin current leaving from the ferromagnet itself, whereas the latter is the Onsager reciprocity of the former. Our work not only provides a concise formalism for the effects of nondephased transverse spins in ferromagnets but also enables to design spintronic devices without an external spin source.
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U2 - 10.1103/PhysRevLett.125.207205
DO - 10.1103/PhysRevLett.125.207205
M3 - Article
C2 - 33258628
AN - SCOPUS:85096088657
VL - 125
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 20
M1 - 207205
ER -