快淬Nd_(3.6)Pr_(5.4)Fe_(83)Co_3B_5薄带的反磁化行为和磁黏滞性

MAGNETIZATION REVERSAL BEHAVIOR AND MAGNETIC VISCOSITY OF NANOCOMPOSITE Nd_(3.6)Pr_(5.4)Fe_(83)Co_3B_5 PREPARED BY MELT SPINNING 

用电弧熔炼法制备了Ｎｄ３ ．６Ｐｒ５ ．４Ｆｅ８３Ｃｏ３Ｂ５ 合金铸锭，然后利用熔旋快淬法在铜辊转速Ｖ＝ ２０ ｍ／ｓ 下制备了Ｎｄ３ ．６Ｐｒ５．４Ｆｅ８３Ｃｏ３Ｂ５ 薄带．快淬带主要由软磁相αＦｅ 和Ｎｄ２Ｆｅ１４Ｂ 型的硬磁相组成．采用直流退磁剩磁曲线方法分析了样品在反磁化过程中的可逆与不可逆磁化部分，并研究了软磁相和硬磁相的反磁化行为，得到样品的不可逆磁化形核场 Ｈｎ０ 约为４４０ｋＡ／ｍ ．同时研究了样品的磁黏滞性，结果表明由于软磁相的存在使得热激活体积较大．

Nanocomposite Nd\-\{3.6\}Pr\-\{5.4\}Fe\-\{83\}Co\-3B\-5 ribbons were prepared by direct melt spinning at wheel speed of 20?m/s. Although Nd\-2Fe\-\{14\}B\|type phase and α\|Fe were found in the ribbons, a single hard magnetic behavior with high coercivity can only be found in the hysteresis loop. The recoil curves show a comparatively high degree of reversibility in the fields below coercivity.From the investigations of reversible and irreversible portions in DC demagnetization remanence curve, the irreversible nucleation field of about 440?kA/m has been obtained in melt\|spun Nd\-\{3.6\}Pr\-\{5.4\}Fe\-\{83\}Co\-3B\-5 ribbons. The measurements of magnetic viscosity show that the time\|dependent magnetization changes are associated with reversal of the hard phase. The thermal fluctuation field of about 2 0?kA/m was obtained.