Title :
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
fDate :
9/1/2002 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2002.801960
