Low Temperature Physics: 46, 841 (2020); https://doi.org/10.1063/10.0001552
Fizika Nizkikh Temperatur: Volume 46, Number 8 (August 2020), p. 997-1007    ( to contents , go back )

Non-stationary forced motion of domain walls in ferrimagnets close to the spin compensation point

B.A. Ivanov1,2, E.G. Galkina3, V.E. Kireev1, N.E. Kulagin4, R.V. Ovcharov2, and R.S. Khymyn5,6

1Institute of Magnetism of the National Academy of Sciences of Ukraine and Ministry of Education and Science of Ukraine, Kyiv 03142, Ukraine
E-mail: bor.a.ivanov@gmail.com

2National Taras Shevchenko University of Kiev, Kiev 03127, Ukraine

3Institute of Physics, National Academy of Sciences of Ukraine, pr. Nauky 46, Kyiv 03028, Ukraine

4Frumkin Institute of Physical Chemistry and Electrochemistry RAS, 31, bld.4, Leninsky prospect, Moscow, 119071 Russia

5Department of Physics, University of Gothenburg, Gothenburg 41296, Sweden

6NanOsc AB, Kista 16440, Sweden
pos Анотація:

Received April 15, 2020, published online June 22, 2020

Abstract

Domain walls motion in ferrimagnets near the sublattices spin compensation point, where the effect of an exchange enhancement in the limit velocity of the wall is present, is studied theoretically. Nonlinear regimes of high-speed (till the limit speed) non-stationary wall motion are found. A region of the parameters of the magnet, where the collective variables approach is not valid, was found. In this region, the wall motion is accompanied by the periodic appearance of instability with respect to the increase in spin vibrations inside the domain wall.

Key words: domain wall, ferrimagnet, spin compensation point, Walker solution.

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