Low Temperature Physics: 41, 730 (2015); https://doi.org/10.1063/1.4931784
Fizika Nizkikh Temperatur: Volume 41, Number 9 (September 2015), p. 938-941    ( to contents , go back )

Relaxation of the magnetic system after the sudden quench of the magnetic field

A.A. Zvyagin

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: zvyagin@ilt.kharkov.ua

Max-Planck-Institut für Physik Komplexer Systeme, Noethnitzer Str., 38, D-01187, Dresden, Germany
pos Анотація:

Received May 18, 2015

Abstract

Sudden quench of the magnetic field causes oscil-lations of the magnetization of the magnetic system, in which the projection of the total spin moment of the system, parallel to the field, is not conserved. The magnitude and the frequency of such oscillations essentially depend in the nonlinear way on the value of the change of the field. Relaxation of the magnetic system in the Landau–Lifshitz form causes nonlinear dependences of the magnitude and the frequency of those oscillations on the relaxation parameter, and also the velocity of relaxation dependence on the parameters of the magnet energy and on the magnitude of the external magnetic field jump.

PACS: 75.10.–b General theory and models of magnetic ordering;
PACS: 75.30.Ds Spin waves;
PACS: 75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.).

Key words: Landau–Lifshits equation, quantum quench.

Published online: July 24, 2015

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