Dynamic simulations of the dipolar driven demagnetization process of magnetic multi-core nanoparticles

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• 作者：A. Weddemann ; A. Auge ; D. Kappe ; F. Wittbracht ; A. Hü ; tten
• 关键词：Magnetic multi-core nanoparticles ; Landau– ; Lifshitz equation ; Magnetic relaxation ; Dipole– ; dipole coupling
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2010
• 出版时间：March 2010
• 年：2010
• 卷：322
• 期：6
• 页码：643-646
• 全文大小：443 K

文摘

In this work, we investigate dynamically the dipolar driven demagnetization process of magnetic multi-core particles by solving the Landau–Lifshitz equation for single-domain particles distributed on a three-dimensional sphere. We analyze the relaxation time in respect to different geometry and material parameters. Further we show that the demagnetization times differ from the behaviour of a single magnetic sphere in the case of low damping. To explain these dynamics nanoparticular systems of different dimensions are investigated. We show that deviations can be attributed to a confinement of the relaxation dynamics to a lower dimensional submanifold of the k-space.