Domain walls in ferromagnetic nanoconstriction

Autor:	L. Berger, J. M. D. Coey, Y. Labaye
Rok vydání:	2002
Předmět:	Physics::Fluid Dynamics Physics Cross section (physics) Magnetic anisotropy Condensed matter physics Ferromagnetism Magnetic domain Magnet Monte Carlo method General Physics and Astronomy Cylinder Thermal fluctuations
Zdroj:	Journal of Applied Physics. 91:5341-5346
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.1461065
Popis:	180° domain walls in ferromagnetic nanoconstrictions are investigated by classical atomic Monte Carlo simulations. Two types of constrictions are considered; one is a uniform circular cylinder (isthmus), the other is a double-truncated cone (hour glass). The wall width is determined by the effective length of the constriction, which may be as little as a nanometer. The wall can have a Neel-like configuration for constrictions much narrower than the normal wall width, but there is a crossover region with vortex-type walls before reaching a Bloch-type wall at larger diameters. In very narrow constrictions, effects of the atomic-scale structure become evident as the domain-wall structure depends on the number of atoms in the cross section. The simulations confirm the prospect of creating very narrow domain walls in a nanoconstricted soft magnetic material, and they indicate the possibility of spontaneous thermal fluctuations between different magnetic modes in walls smaller than about 10 nm.
Databáze:	OpenAIRE
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