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magnetic microstructures of 2∶17 Type Sm(Co,Fe,Cu,Zr)_z Magnets Detected by magnetic Force Microscopy

Journal of Rare Earths 2006年第2期24卷 214-217页

作者：夏爱林郭朝晖李卫韩宝善 State Key Laboratory of Magnetism Beijing National Laboratory for Condensed Physics Institute of Physics Chinese Academy of Sciences Beijing 100080 China Division of Functional Materials Central Iron and Steel Research Institute Beijing 100081 China State

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 eoated 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.

关键词： 2:17 type Sm-Co permanent magnets magnetic microstructures magnetic force microscopy (MFM) rare earths

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magnetic properties,crystalline and magnetic microstructures of dual-main-phase(Nd,Ce)-Fe-B sintered magnets

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Journal of Materials Science & Technology 2023年第31期162卷 99-108页

作者： Yifei Xiao Lele Zhang Tao Liu Xiaolong Song Qisong Sun Yikun Fang Minggang Zhu Wei Li Division of Function Materials Center Iron and Steel Research InstituteBeijing 100081China

The(Nd,Ce)-Fe-B sintered magnets were prepared by a dual-main-phase(DMP)process under the same conditions using different combinations of Nd-Fe-B with Ce-Fe-B and(Nd,Ce)-Fe-B *** crystalline and magnetic microstructures of DMP(Nd,Ce)-Fe-B magnets with the remanence of 11.92-12.68 kGs,the intrinsic coercivity of 3.97-5.31 kOe,and the maximum energy product of 23.08-32.99 MGOe have been *** force microscope(MFM)investigations reveal that the DMP(Nd,Ce)-Fe-B magnets show maze-like patterns,which are like that of standard anisotropy Nd-Fe-B sintered magnets by and ***,much finer domain structures mixing with coarse ones can be observed obviously in DMP(Nd,Ce)-Fe-B sintered *** size distribution of the domain width of the DMP(Nd,Ce)-Fe-B magnet is not uniform *** average domain width is W=0.912μm,and the fine domain width has only 0.216μ*** smaller domain width and more branch domain patterns exist in poorer coercivity DMP *** is caused by the non-uniform Ce composition of poorer property DMP magnets and the grain boundary microstructure that is not conducive to improving the ***,it is found that some domains of rare-earth-rich grain boundary phases exhibit the characteristics of plate-like patterns rather than no-contrast by using MFM,indicating their *** correlations between the crystalline microstructure,chemical composition of phases,and magnetic structure were demonstrated for the DMP magnets.

关键词： magnetic microstructures Dual-main-phase(DMP) (Nd,Ce)-Fe-B Core-shell structure magnetic force microscope

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