The Role of Crystallographic Texture in Microwave and Millimet

Crystallographic texture in the hexaferrites is closely related to magnetocrystalline anisotropy energy and fields. The magnetic anisotropy in turn is valuable in defining both the ferromagnetic resonance frequency and the frequency dependence of permeability. The setting of the FMR frequency determ...

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Bibliographic Details
Published in:AIP conference proceedings 2012-03
Main Authors: Chen, Yajie, Geiler, Anton, Fitchorov, Trifon, Daigle, Andrew, Vittoria, Carmine, Harris, Vincent
Format: Article
Language:English
Online Access:Get full text
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Summary:Crystallographic texture in the hexaferrites is closely related to magnetocrystalline anisotropy energy and fields. The magnetic anisotropy in turn is valuable in defining both the ferromagnetic resonance frequency and the frequency dependence of permeability. The setting of the FMR frequency determines among other things the operational frequency and frequency agile device performance. Here, we review the role of crystal texture in determining the magnetic anisotropy fields of a series of hexaferrite materials including the M, Y and Z type structures. Furthermore, the ability to strongly texture materials as powder compacts, and thick and thin films is explored in detail. Strategies to realize crystal texture include lattice matching of substrates and buffer structures as well as the use of magnetic fields during processing. The application of hexaferrites in microwave circulators, phase shifters, and in the design and processing of low profile antennas are demonstrated.
ISSN:0094-243X