Dependence of magnetic properties of HDDR Nd-Fe-B bonded magnet on intergranular phase |
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Authors: | Min Liu RuWei Gao GuangBing Han Wu Yang |
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Affiliation: | School of Physics, Shandong University, Jinan 250100, China |
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Abstract: | Using proposed different anisotropy expressions K1'(r) and K1'(r) at the grain boundary, we investigate the effect of intergranular phase (IP) on the average anisotropy of grain boundary and the coer-civity Hc of HDDR (hydrogenation, disproportionation, desorption and recombination) Nd-Fe-B bonded magnet. The results indicate that when the IP’s thickness d is zero, and Hc based on K1'(r) are equal to the corresponding ones based on K1'(r). While d takes nonzero values, and Hc based on K1'(r) falls and rises more rapidly, respectively, with increasing d. When d is 1 nm and the structure defect thickness r0 is close to the thickness of domain wall (~4 nm), the calculated coercivity is con-sistent well with the avaiable experimental data. |
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Keywords: | HDDR Nd-Fe-B magnet intergranular phase structure defect coercivity |
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