Ferromagnetic resonance in systems with competing uniaxial and cubic anisotropies |
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Authors: | H Kachkachi D S Schmool |
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Institution: | (1) Groupe d'étude de la Matière Condensée, Université de Versailles St. Quentin, CNRS UMR8635, 45 Av. des états-Unis, 78035 Versailles, France;(2) Depto. de Fisica and IFIMUP, Universidade do Porto, Rua Campo Alegre 687, 4169 007 Porto, Portugal |
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Abstract: | We develop a model for ferromagnetic resonance in systems with competing uniaxial and cubic anisotropies. This model applies
to (i) magnetic materials with both uniaxial and cubic anisotropies, and (ii) magnetic nanoparticles with effective core and
surface anisotropies;
We numerically compute the resonance frequency as a function of the field and the resonance field as a function of the direction
of the applied field for an arbitrary ratio of cubic-to-uniaxial anisotropy.
We also provide some approximate analytical expressions in the case of weak cubic anisotropy. We propose a method that uses
these expressions for estimating the uniaxial and cubic anisotropy constants, and for determining the relative orientation
of the cubic anisotropy axes with respect to the crystal principle axes. This method is applicable to the analysis of experimental
data of resonance type measurements for which we give a worked example of an iron thin film with mixed anisotropy. |
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Keywords: | 76 50 +g Ferromagnetic antiferromagnetic and ferrimagnetic resonances 75 75 +a Magnetic properties of nanostructures 75 10 Hk Classical spin models |
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