Spin-current-induced high-frequency magnetisation rotations and microwave oscillations in magnetic nanodevices

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Published 30/07/2012

Abstract

In the paper, the authors first review the structural and functional characteristics of magnetic nanodevices where magnetisation rotations and microwave oscillations are induced by DC electrical currents due to the spin-transfer torque effect. A comparison is made between devices with different structures. Micromagnetic simulations based on the modified Landau–Lifshitz–Gilbert equation are carried out in detail on one of the structures. The study shows that the spin-polarised direct current drives the inhomogeneous magnetisation configuration to rotate in the constrained square magnet structure. Magnetisation configurations and dynamics depend on the input current density and the structure dimension.

Inspec keywords: oscillations; current density; electron spin polarisation; nanoelectronics; magnetic microwave devices; magnetisation; micromagnetics

Other keywords: high-frequency magnetization rotations; spin current; modified Landau-Lifshitz-Gilbert equation; inhomogeneous magnetization; micromagnetic simulations; spin-transfer torque effect; constrained square magnet; current density; DC electrical currents; magnetic nanodevices; microwave oscillations; spin-polarized direct current

Subjects: Microwave magnetic devices; Spin arrangements in magnetically ordered materials; Magnetization curves, hysteresis, Barkhausen and related effects

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