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Array anisotropy in structured thin film arrays: Influence on the magnetodynamics |
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| Authors: | M WolfC Patschureck R SchäferI Mönch L Schultz J McCord |
| Institution: | a IFW Dresden, Institute for Metallic Materials, PO 270116, D-01171 Dresden, Germany b IFW Dresden, Institute for Integrative Nanoscience, PO 270116, D-01171 Dresden, Germany c TU Dresden, Department of Mechanical Engineering, Institute for Materials Science, D-01062 Dresden, Germany d Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, PO 510119, D-01314 Dresden, Germany |
| Abstract: | The dynamic magnetic properties of soft-ferromagnetic thin film element arrays are strongly influenced by long range interelement magnetostatic interaction. In order to estimate the effective array dipolar field a quantitative model is presented, which is based on the superposition of stray fields that arise from the neighborhood of a reference element. Kittel's equation, that describes the magnetodynamics, is generalized for magnetically saturated arrays by additional array dipolar field terms. Measurements of the magnetodynamic response of quasi-saturated arrays with a rectangular base agree with theoretical predictions. Thus, our model allows the estimation of the frequency of the uniform precessional mode in mesoscopic thin film arrays with non-negligible magnetostatic interaction. |
| Keywords: | Magnetization dynamics Macrospin precession Array anisotropy Magnetostatic interaction |
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