Anomalous Resonant Microwave Absorption in Nanocrystalline Gadolinium: Role of Magnetic Anisotropy
An elaborate lineshape analysis of the ferromagnetic resonance spectra taken in the temperature range 113 K to 323 K on nanocrystalline Gadolinium reveals that the random intra-grain anisotropy and the interfacial random anisotropy give rise to several anomalous features in the temperature variations of resonance field, H res, linewidth, ΔH pp, anisotropy field, H k and magnetization, M, that include: a dip (peak) in H res(T) (M(T)) at a temperature just below the Curie point, T C, unusually broad linewidths at low and intermediate temperatures and a steep decline in ΔH pp (T) as T → T C, a broad maximum in H k (T) at the spin reorientation temperature, and strongly suppressed M(T) particularly at T ≪ T C.
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Document Type: Short Communication
Publication date: August 1, 2011
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