Magnetic domain structures of precipitation-hardened SmCo 2:17-type sintered magnets: Heat treatment effect
Li Xiu-Mei(李岫梅)a)†, Fang Yi-Kun(方以坤)a), Guo Zhao-Hui(郭朝晖)a), Liu Tao(刘涛)a), Guo Yong-Quan(郭永权)a), Li Wei(李卫)a), and Han Bao-Shan(韩宝善)b)
a Division of Functional Materials Research, Central Iron & Steel Research Institute, Beijing 100081, China; b State Key Laboratory of Magnetism, Institute of Physics and the Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
Abstract The typical magnetic domains of Sm(CobalFe0.25Cu0.07Zr0.02)7.4 magnets quenched through various heat-treatment steps have been revealed by using magnetic force microscopy (MFM). For the specimens in which the nominal c-axis is perpendicular to the imaging plane, the domain configurations change from plate-like for the as-sintered magnet to corrugation and spike-like for the homogenized one, and then to a coarse and finally to a finer domain structure when isothermally aged at 830℃ and then annealed at 400℃. However, only plate-like domains can be detected on the surfaces with the nominal c-axis parallel to the imaging plane. The finer domain (so-called interaction domain) is a characteristic magnetic domain pattern of the Sm--Co 2:17-type magnets with high coercivities. Domain walls in a zigzag shape are revealed by means of MFM in final bulk Sm--Co 2:17-type sintered magnets.
Received: 17 November 2007
Revised: 13 December 2007
Accepted manuscript online:
(Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization)
Fund: Project
supported by the Beijing Municipal Science and Technology Committee
Key Project, China (Grant No D0406002000091) and the National
Natural Science Foundation of China (Grant No 10374110).
Cite this article:
Li Xiu-Mei(李岫梅), Fang Yi-Kun(方以坤), Guo Zhao-Hui(郭朝晖), Liu Tao(刘涛), Guo Yong-Quan(郭永权), Li Wei(李卫), and Han Bao-Shan(韩宝善) Magnetic domain structures of precipitation-hardened SmCo 2:17-type sintered magnets: Heat treatment effect 2008 Chin. Phys. B 17 2281
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