Abstract
Field-guided magnetic dynamics in magnetic multilayer nanostructures involves interconnection of the control field with localized spin states, which can occur directly or indirectly depending on the nature of the field and spin polarization. At the control electromagnetic field, this interconnection can be directly induced by the photon-induced spin-flip processes and indirectly by a bias field during antiferromagnetic exchange relaxation. The control impact of electric field and electric current on the magnetic states occurs indirectly via the spin polarization and spin current in combination with the exchange interaction of these polarized spins with localized magnetic states. The corresponding description of the magnetic dynamics is based on the modified Landau-Lifshitz equation and spin diffusion equations, taking into account the spin Hall and the inverse spin Hall effects for systems with normal metal sublayers. In the case of the magnetic nanostructures with the Rashba spin-orbit interaction in interfaces, the electric field-controlled magnetization is realized via the Rashba field-induced spin polarization, and its exchange interaction with localized magnetic states. Corresponding description is based on a tight-binding model of spin-orbit-coupled electrons exchange coupled to the localized magnetic states.
Highlights
The external field-controlled magnetization of the multilayer magnetic nanostructures is based on the excitation of the coherent spin polarization, a spin current and their exchange interaction with localized magnetic states [1, 2]
The pulse field manipulation by magnetic properties of multilayer magnetic nanostructures is based on an excitation of the coherent electron spin polarization coupled by the exchange interaction with localized magnetic states and heatinduced demagnetization
The controlled impact of the strong enough laser field on the magnetic nanostructures with an antiferromagnetic exchange interaction occur due to the effective bias fields caused by the different time of the heat demagnetization of magnetic sublattices and the relaxation of the antiferromagnetic exchange interaction
Summary
The external field-controlled magnetization of the multilayer magnetic nanostructures is based on the excitation of the coherent spin polarization, a spin current and their exchange interaction with localized magnetic states [1, 2]. The electric field-controlled magnetization can occur directly via the Rashba spin-orbit interaction and its effective bias field causing the spin polarization of itinerant electrons in interfaces exchange coupled with the localized magnetic states [7, 8]. In this case, the external electric field can result in changes of a surface magnetic anisotropy, switching of the perpendicular magnetic anisotropy. In the tight-binding model of spin-orbit-coupled electrons exchange-coupled to a background ferromagnetic order parameter it is described the dependence of the magnetic anisotropy on the electron structure of the system and an electron band filling
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