Low Temperature Physics: 46, 773 (2020); https://doi.org/10.1063/10.0001539
Fizika Nizkikh Temperatur: Volume 46, Number 8 (August 2020), p. 920-926    ( to contents , go back )

Dipole-dominated dissipative magnetic solitons in quasi-one-dimensional spin-torque oscillators

R.V. Verba

Institute of Magnetism NAS of Ukraine and MES of Ukraine, Kyiv 03142, Ukraine
E-mail: verrv@ukr.net

V.S. Tiberkevich and A.N. Slavin

Department of Physics, Oakland University, Rochester, Michigan 48309, USA
pos Анотація:

Received March 5, 2020, published online June 22, 2020

Abstract

It is well-known that a spin-transfer torque caused by a dc electric current can excite in a two-dimensional ferromagnetic film exchange-dominated magnetic solitons, often called “spin-wave bullets”, under the condition of a negative nonlinear shift of spin wave frequency. In this work, we demonstrate that in a quasi-one-dimensional (1D) case, e.g., in a nanowire spin-Hall oscillator, it is possible to excite a stable dissipative magnetic soliton, which is dominated by the dipole-dipole interaction. This dissipative magnetic soliton can be described in the framework of a 1D Ginzburg–Landau auto-oscillator model, and has the shape similar to that of the exchange-dominated spin wave bullet, but with a different spatial localization law. The influence of the dipolar interaction makes possible the stabilization of a dissipative soliton in a relatively large (micron-sized) active area of the oscillator, which is in a sharp contrast with the two-dimensional case, where the excitation of a stable spin-wave bullet was observed only in relatively small active areas having typical sizes of the order of 100 nm. The characteristics and possible applications of these dipole-dominated spin wave bullets are discussed.

Key words: spin-wave bullet, spin-torque oscillator, soliton, dipolar interaction.

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