Magnetostatic Modes in Samples With Inhomogeneous Internal Fields
Author
dc.contributor.author
Arias Federici, Rodrigo
Admission date
dc.date.accessioned
2016-01-22T01:57:12Z
Available date
dc.date.available
2016-01-22T01:57:12Z
Publication date
dc.date.issued
2015
Cita de ítem
dc.identifier.citation
IEEE Magnetics Letters Volume 6 (2015)
en_US
Identifier
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DOI: 10.1109/LMAG.2015.2497325
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/136681
General note
dc.description
Artículo de publicación ISI
en_US
Abstract
dc.description.abstract
Magnetostatic modes in ferromagnetic samples have been studied systematically since the 1950s. They are very well characterized and understood in samples with uniform internal magnetic fields. More recently, interest has shifted to the study of magnetization modes in ferromagnetic samples with inhomogeneous internal fields. This paper shows that under the magnetostatic approximation and for samples of arbitrary shape and/or arbitrary inhomogeneous internal magnetic fields, the modes can be classified as elliptic or hyperbolic, and their associated frequency spectrum and spatial range can be delimited. This results from the analysis of the character of the second-order partial differential equation satisfied by the magnetostatic potential: i.e., if it is hyperbolic or elliptic (parabolic is a limiting case). In elliptic regions, the magnetostatic modes have a smooth monotonic character (with generally decaying or "tunneling" behavior from the surfaces) and in hyperbolic regions an oscillatory wave-like character. A simple local criterion distinguishes hyperbolic from elliptic regions: the sign of a frequency-dependent susceptibility parameter. This study shows that one may control to some extent magnetostatic modes via external fields or geometry. For example, one may imagine propagation along interior regions avoiding surfaces, as is suggested in one case presented here.
en_US
Patrocinador
dc.description.sponsorship
NSF Materials World Network Program Grant
DMR-1210850
DOE Grant
DE-FG02-84ER45083
Center for the Development of Nanoscience and Nanotechnology CEDENNA (Chile)
FB0807
ICM FP10-061-F-FIC