Surface anisotropy and vortex states in ferromagnetic wires

Author

Rössler, Ulrich K. ; Bogdanov, Alexei N. ; Muller, K.-H.

Author_Institution

Group for Theor. Solid State Phys., Insitut fur Festkorper-und Werkstofforschung, Dresden, Germany

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

2586

Lastpage

2588

Abstract

In magnetic nanowires, surface-anisotropy from lateral surfaces may have a dominating influence on magnetic properties and, overcoming the stray-field energy, may cause spin-reorientation transitions from the homogeneous longitudinal magnetization state. Within a micromagnetic description, a general model for infinitely long cylindrical ferromagnetic wires under the influence of surface anisotropy is formulated and specialized to solutions with cylindrical symmetry. An analytic solution describing a continuous transition into stray-field-free vortex-states due to the axial part of the surface-anisotropy is presented. General properties of vortex-states stabilized by surface-anisotropy in cylindrical wires are briefly discussed.

Keywords

exchange interactions (electron); ferromagnetic materials; interface magnetism; magnetic anisotropy; magnetic domains; nanostructured materials; quantum wires; spin dynamics; surface magnetism; Bloch-vortices; Neel vortices; antisymmetric exchange interactions; artificially structured materials; cylindrical symmetry; exchange couplings; homogeneous longitudinal magnetization state; infinitely long cylindrical ferromagnetic wires; intrinsic homogeneous interactions; lateral surfaces; magnetic energy; magnetic nanowires; magnetocrystalline anisotropies; micromagnetism; spin-reorientation transitions; stray-field energy; surface-anisotropy; vortex-states; Anisotropic magnetoresistance; Magnetic anisotropy; Magnetic properties; Magnetization; Micromagnetics; Nanostructures; Nanowires; Perpendicular magnetic anisotropy; Physics; Wires;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.801960

Filename

1042276