Magnetism

Simulation of the dynamics of the magnetic moment of a chain of dipoles in the domain wall motion

A. M. Shutyi, D. I. Sementsov

Ulyanovsk State University

Abstract: The dynamics of the magnetic moment of a single-row chain of magnetic nanodots in the motion of a domain wall under the influence of an external static magnetic field has been investigated using the computer simulation. Oscillation modes of transverse components of the magnetic moment of the system have been revealed. It has been found that the frequency of the oscillation modes is determined by the external field and their amplitude is determined by the energy of interaction between the chain elements. These oscillations are modulated and represent a sequence of trains in a weak exchange interaction and approach single-frequency harmonic oscillations in a strong exchange interaction. When the external field deviates from the axis of the chain, the oscillations become chaotic. The dependence of the velocity of a domain wall in the chain on the exchange interaction energy and the applied field has been obtained. The effect of anisotropy on the dynamics of the system has been revealed.

Received: 26.03.2015

 English version: Physics of the Solid State, 2015, 57:10, 2000–2010

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