Eur. Phys. J. B (2017) 90: 55
https://doi.org/10.1140/epjb/e2017-70748-9

Regular Article

Equilibrium bi-domain configuration in cylindrical magnetic microparticles

Department of Radiophysics, Electronics and Computer Systems, Taras Shevchenko National University of Kyiv, 01601 Kyiv, Ukraine

^a e-mail: maximpopov@univ.kiev.ua

Received: 26 December 2016
Received in final form: 1 February 2017
Published online: 27 March 2017

Abstract

This report is on the equilibrium bi-domain structure in magnetic microparticles of cylindrical shape with circular or elliptic cross-section and finite thickness. The model is for two coaxial 180 degree domains. The dependence of the inner domain dimensions on bias magnetic field was estimated for a series of particle aspect ratios. It is shown that a change in bias field leads to significant variation in the inner domain radius and that such variations occur at decreasing field strength as the particle height increases. Results of our model are of importance for magnetic particles ground state calculations and analysis of spin-wave oscillations in ferrite micro- and nano-resonators with non-uniform internal magnetization.