Positive temperature coefficient of coercivity in Sm{sub 1−x}Dy{sub x}(Co{sub 0.695}Fe{sub 0.2}Cu{sub 0.08}Zr{sub 0.025}){sub 7.2} magnets with spin-reorientation-transition cell boundary phases

Journal Article · Mon Feb 02 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4907640· OSTI ID:22420258

Liu, L.; Liu, Z.; Li, M.; Lee, Don; Chen, R. J.; Liu, J.; Li, W.; Yan, A. R. ^[1]

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1. Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201 (China)

Positive temperature coefficients of coercivity are first obtained in the series of Sm{sub 1−x}Dy{sub x} (Co{sub 0.695}Fe{sub 0.2}Cu{sub 0.08}Zr{sub 0.025}){sub 7.2} magnets. The temperature range with a positive temperature coefficient of coercivity is gradually moving to higher temperature with the increase of x. Thermal magnetic analysis shows a spin reorientation transition of cell boundary phase in these magnets. It is interesting to find the abnormal coercivity is controlled by the spin-reorientation-transition cell boundary phases, and the spin reorientation temperature of cell boundary phase is consisted with the start point of the temperature range with abnormal behavior. The different temperature coefficients are discussed in terms of a nucleation model.

• OSTI ID: 22420258
• Journal Information: Applied Physics Letters, Vol. 106, Issue 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

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