Generalized spin-orbit torques in two-dimensional ferromagnets with spin-orbit coupling

Chao Yang, Zheng-Chuan Wang (), Qing-Rong Zheng and Gang Su ()
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Chao Yang: School of Physical Sciences, University of Chinese Academy of Sciences
Zheng-Chuan Wang: School of Physical Sciences, University of Chinese Academy of Sciences
Qing-Rong Zheng: School of Physical Sciences, University of Chinese Academy of Sciences
Gang Su: School of Physical Sciences, University of Chinese Academy of Sciences

The European Physical Journal B: Condensed Matter and Complex Systems, 2019, vol. 92, issue 6, 1-7

Abstract: Abstract Based on the spinor Boltzmann equation, we obtain the continuity equations of charge and spin accumulation in two-dimensional ferromagnets with Rashba or Dresselhaus spin-orbit coupling, in which the spin diffusion equation (the continuity equation of spin accumulation) gives the spin-orbit torques that have an extra term of charge density gradient that is paid little attention in previous studies. Numerical results indicate this term plays an important role in inhomogeneous systems. In order to study the magnetization dynamics of ferromagnets, we solve the Landau-Lifshitz-Gilbert equation together with the spin diffusion equation. Our results indicate that the magnetization in systems with Rashba SOI is easier to be switched by an external electric field than the system with Dresselhaus SOI, and for anisotropic ferromagnets, we study the critical external electric field that manipulate the reversal of magnetization. Graphical abstract

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (1)

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DOI: 10.1140/epjb/e2019-100147-y

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