Geometry induced phase transitions in magnetic spherical shell
Abstract
Equilibrium magnetization states in thin spherical shells of a magnetically soft ferromagnet are determined by the competition between two interactions: (i) The local exchange interaction favours the more homogeneous onion state with magnetization oriented in meridian directions; such a state is realized in relatively small particles. (ii) The nonlocal magnetostatic interaction prefers the double-vortex configuration with the magnetization oriented in the parallels directions, since it minimizes the volume magnetostatic charges. These sates are topologically equivalent, in contrast to the same-name states of magnetic nanoring. As a consequence, a continuous (the second order) phase transition between the vortex and onion states takes place. The detailed analytical description of the phase diagram is well confirmed by micromagnetic simulations.
Cite
@article{arxiv.1609.08555,
title = {Geometry induced phase transitions in magnetic spherical shell},
author = {Mykola I. Sloika and Denis D. Sheka and Volodymyr P. Kravchuk and Oleksandr V. Pylypovskyi and Yuri Gaididei},
journal= {arXiv preprint arXiv:1609.08555},
year = {2018}
}
Comments
11 pages, 6 figures