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New magnetostatic modes in small nonellipsoidal magnetic particles | | H. Puszkarski
; M. Krawczyk
; J.-C.S. Levy
; | | Date: |
19 Aug 2005 | | Subject: | Mesoscopic Systems and Quantum Hall Effect | cond-mat.mes-hall | | Abstract: | Magnetostatic normal modes are investigated here in elongated rods. The dipolar field resulting from the dipole-dipole interactions is calculated numerically in points of the axis connecting opposite rod face centers (emph{central axis}) by collecting individual contributions to this field coming from each of the atomic planes perpendicular to the central axis. The applied magnetic field is assumed to be oriented along the central axis, and the magnetization to be uniform throughout the sample. The emph{frequency} spectrum of magnetostatic waves propagating in the direction of the applied field is found numerically by solving the Landau-Lifshith equation of motion with the spatially emph{nonhomogeneous} dipolar field taken into account; the mode amplitude emph{profiles} are depicted as well. While energetically highest modes have emph{bulk-extended} character, the modes forming the lower part of the spectrum are localized in the subsurface region (emph{bulk-dead modes}). Between these two mode types, magnetostatic modes of a new type (emph{comb modes}) are found to occur, characterized by two clearly discernible regions: a zone of fast amplitude oscillations inside the rod, and narrow slow-oscillation regions at the borders. Absorbing virtually no energy from an applied alternating field, comb modes will have no significant contribution to the magnetic noise. | | Source: | arXiv, cond-mat/0508456 | | Services: | Forum | Review | PDF | Favorites | |
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