Hydrogenation effect on the hysteresis properties of rapidly quenched Nd-Ho-Fe-Co-B alloys

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• 作者：I. Tereshina^a ; ^b ; ^{teresh@imet.ac.ru} ; N. Kudrevatykh^b ; ^c ; E. Tereshina^d ; G. Burkhanov^a ; O. Chistyakov^a ; R. Grechishkin^e ; A. Salamova^f ; V. Verbetsky^f
• 关键词：Rare earth&mdash ; iron compounds ; Hydrogenation ; Coercive field ; Magnetic hysteresis
• 刊名：Journal of Alloys and Compounds
• 出版年：2011
• 出版时间：September, 2011
• 年：2011
• 卷：509
• 期：supp_S2
• 页码：S835-S838
• 全文大小：1K

文摘

The hydrogenation effect on the hysteresis properties of rapidly quenched (RQ) (Nd_0.55Ho_0.45)_2.7(Fe_0.8Co_0.2)₁₄B_1.2 compound obtained by melt-spinning is studied. A comparative study of RQ alloy and its hydride (Nd_0.55Ho_0.45)_2.7(Fe_0.8Co_0.2)₁₄B_1.2H_2.5 has shown that hydrogenation resulted in the increase of magnetization without significant effect on the Curie temperature. In contrast to hydrogen-free alloy having a maximum on the H_c(T) curve, the H_c of the hydrogen-charged compound increased monotonously with decreasing temperature. Among the factors affecting H_c in hydrogenated sample are the increase of the grain size of the crystalline phase and the decrease of both the iron and the rare earth contributions to the magnetocrystalline anisotropy. High-field hysteretic distortions of the magnetization/demagnetization curves of RQ and RQ + hydrogen samples are observed at 4.2 K in fields up to 90 kOe indicating the existence of a magnetic phase with very high local coercivity.