Kondorski reversal in magnetic nanowires

Authors

Ralph A. Skomski, University of Nebraska-LincolnFollow
Eva Schubert, University of Nebraska-LincolnFollow
Axel Enders, University of Nebraska-LincolnFollow
David J. Sellmyer, University of Nebraska at LincolnFollow

Document Type

Article

Date of this Version

2014

Citation

JOURNAL OF APPLIED PHYSICS 115, 17D137 (2014)

Abstract

Magnetization reversal in nanowire systems, such as alnico-type permanent magnets, slanted columns produced by glancing-angle deposition, and nanowires embedded in alumina templates, is investigated by model calculations. The angular dependence of the domain-wall propagation is Kondorski-like, reminiscent of Kondorski pinning in bulk materials but with a somewhat different physics and consistent with Kerr hysteresis-loop measurements. Criss-cross patterning of alnicos improves the coercivity but reduces the remanence, with virtually zero net effect on energy product. Finally, we briefly discuss the wire-radius dependence of the coercivity in the context of "shape anisotropy" and the occurrence of interaction domains in alnico.