Magnetic reversal and magnetic memory effect in melt-spun Pr₂Fe₁₄B/α-Fe nanocomposite ribbons

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• 作者：Guangbing HAN ((韩广兵))^a ; ^{hangb@sdu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Hao SU ((苏 浩))^a ; Ruwei GAO ((高汝伟))^a ; Shuyun YU ((于淑云))^a ; Shishou KANG ((康仕寿))^a ; Minggang ZHU ((朱明刚))^b ; Wei LI ((李 卫))^b ; X.B. Liu^c
• 关键词：magnetization reversal ; exchange coupling ; magnetic memory effect ; nanocomposite alloys ; coercivity ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2015
• 出版时间：1 December 2015
• 年：2015
• 卷：33
• 期：12
• 页码：1303-1309
• 全文大小：812 K

文摘

The influence of CoCr addition on the microstructure and magnetic properties was investigated in nanocomposite Pr₂Fe₁₄B/α-Fe alloys prepared by melt spinning. It was shown that the magnetic properties of Pr₂Fe₁₄B/α-Fe nanocomposite were improved by an addition of 10 at.% CoCr, in particular, coercivity (_jH_c) from 4.9 up to 5.3 kOe, maximum energy product ((BH)_max) from 10.6 up to 13.9 MGOe, and remanence (M_r) from 94.2 up to 98.4 emu/g. The field dependencies of the reversible and irreversible magnetization components were derived from the recoil loops. Combining with the initial magnetization curves, the results indicated that the pinning of domain walls at the grain boundaries dominated the magnetization reversal in Pr₂Fe₁₄B/α-Fe nanocomposite alloys. The magnetic memory effect was studied by measuring the magnetic moment relaxation at a cycle negative magnetic field with time interval of 600 s. The exchange-spring magnets with magnetic memory effect have a high potential for high density magnetic recording.