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Anomalous Resonant Microwave Absorption in Nanocrystalline Gadolinium: Role of Magnetic Anisotropy

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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 TT C, a broad maximum in H k (T) at the spin reorientation temperature, and strongly suppressed M(T) particularly at TT C.
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Keywords: FERROMAGNETIC RESONANCE; MAGNETIC ANISOTROPY; NANOCRYSTALLINE GADOLINIUM; RESONANT MICROWAVE ABSORPTION

Document Type: Short Communication

Publication date: August 1, 2011

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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