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Subterahertz ferrimagnetic spin-transfer torque oscillator

Journal article
Authors I. Lisenkov
Roman Khymyn
Johan Åkerman
N. X. Sun
B. A. Ivanov
Published in Physical Review B
Volume 100
Issue 10
ISSN 2469-9950
Publication year 2019
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1103/PhysRevB.100.100...
Keywords driven, gdfeco, Materials Science, Physics
Subject categories Physical Sciences

Abstract

A theory of magnetization dynamics in ferrimagnetic materials with antiparallel aligned spin sublattices under the action of spin-transfer torques (STTs) is developed. In contrast with antiferromagnets, the magnetic sublattices in ferrimagnets are formed by different magnetic ions, which results in a symmetry breaking in the dynamic equations for Neel's vector. We demonstrate that this symmetry breaking becomes crucially essential for the THz signal extraction in ferrimagnetic spin-torque oscillators. As an example, we consider magnetization dynamics in GdFeCo layers in spin Hall and nanocontact spin-torque oscillator geometries. We demonstrate that (i) the application of spin current leads to a conical precession of Neel's vector with sub-THz frequencies, (ii) in the spin Hall geometry, the conical precession leads to sub-THz oscillations of the Hall voltage, and (iii) in the nanocontact geometry the Neel's vector precession leads to sub-THz oscillations of the magnetoresistance.

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