Magnetic Microstructures of 2:17 Type Sm(Co,Fe,Cu,Zr)z Magnets Detected by Magnetic Force Microscopy
来源期刊：JOURNAL OF RARE EARTHS2006年第2期
论文作者：Han Baoshan Xia Ailin Guo Zhaohui Li Wei
Key words：2:17 type Sm-Co permanent magnets; magnetic microstructures; magnetic force microscopy (MFM); rare earths;
Abstract: The magnetic microstructures of 2:17 type Sm(Co,Fe,Cu,Zr)z magnets were detected by magnetic force microscopy.Comparing the microstructures of the specimens coated with and without Ta thin film before and after heat-treatment, it is found that: (a) as a protection layer, Ta coating layer about 20 nm thick can effectively restrain Sm volatilization under high temperature;(b) the stress built in the 2:17 type Sm-Co magnets during specimen preparation only affects some local parts of the domain structures;(c) the magnetic microstructures vary largely for specimens heat-treated at high temperature without Ta film coating due to Sm volatilization.In addition, by comparing with high coercivity Fe-Pt point tips, it is found that the Co-Cr thin-film tips are not suitable for detecting the magnetic microstructures of strong permanent magnets.
Han Baoshan1，Xia Ailin1，Guo Zhaohui2，Li Wei2
(1.State Key Laboratory of Magnetism, Beijing National Laboratory for Condensed Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;
2.Division of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081, China)
Abstract:The magnetic microstructures of 2:17 type Sm(Co,Fe,Cu,Zr)z magnets were detected by magnetic force microscopy.Comparing the microstructures of the specimens coated with and without Ta thin film before and after heat-treatment, it is found that: (a) as a protection layer, Ta coating layer about 20 nm thick can effectively restrain Sm volatilization under high temperature;(b) the stress built in the 2:17 type Sm-Co magnets during specimen preparation only affects some local parts of the domain structures;(c) the magnetic microstructures vary largely for specimens heat-treated at high temperature without Ta film coating due to Sm volatilization.In addition, by comparing with high coercivity Fe-Pt point tips, it is found that the Co-Cr thin-film tips are not suitable for detecting the magnetic microstructures of strong permanent magnets.
Key words:2:17 type Sm-Co permanent magnets; magnetic microstructures; magnetic force microscopy (MFM); rare earths;
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