Sweep rate and temperature dependence of the coercivity in Nd60-xFe30Al10Dyx, x=0, 2 and 4, bulk amorphous ferromagnets
Sweep rate and temperature dependence of the coercivity in Nd60-xFe30Al10Dyx, x=0, 2 and 4, bulk amorphous ferromagnets
复制标题
Nd60-xFe30Al10Dyx（x=0、2 和 4）大块非晶铁磁体中矫顽力的扫描速率和温度依赖性
DOI：
10.1016/j.jmmm.2012.03.048
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发表时间：
2012-08-01
影响因子：
2.7
通讯作者：
Xu, H.
中科院分区：
文献类型：
--
作者：
Tan, X. H.;Collocott, S. J.;Xu, H.
制备了Nd_（60-x）Fe_（30）Al_（10）Dyx（x=0，2和4）大块非晶铁磁合金。在室温下，所有的合金都表现出硬磁性能，并且可以看出，随着镝含量的增加，即从0.337 T（x=0）增加到0.537 T（x=4），本征矫顽力（μ H-0（c）1）增加。作为磁场扫描速率的函数的内禀磁化率的测量，并从这些测量的波动场，H-F，为每种合金，被确定。从300 K到10 K，对每种合金进行了本征矫顽力的测量，并且在所有情况下，随着温度的降低，本征矫顽力增加，在迅速降低之前在40-70 K附近达到最大值。对于每种合金，在其峰值以上至300 K的温度范围内，本征矫顽力的温度依赖性可以通过Gaunt（1983）[11]的畴壁强钉扎模型很好地解释。进一步深入了解这些合金的磁性能是从检查在第一象限的退磁曲线的行为，使用平均场相互作用模型。这使得能够确定每种合金的饱和磁化强度、各向异性场和各向异性常数随镝含量增加而变化的行为。(C)2012爱思唯尔有限公司版权所有。
Bulk amorphous ferromagnet alloys of composition Nd60-xFe30Al10Dyx, x=0, 2 and 4, have been prepared. At room temperature all the alloys exhibit hard magnetic properties, and the intrinsic coercivity (mu H-0(c)1) is seen to increase with increasing dysprosium content i.e. from 0.337 T, x=0, to 0.537 T, x=4. Measurements of the intrinsic coercivity as a function of magnetic field sweep rate are made, and from these measurements the fluctuation field, H-f, for each alloy, is determined. Measurements of the intrinsic coercivity were made for each alloy from 300 K to 10 K, and in all cases with decreasing temperature the intrinsic coercivity increases, reaching a maximum around 40-70 K, before decreasing rapidly. For each alloy, in the temperature region above its peak to 300 K, the temperature dependence of the intrinsic coercivity is well explained by the strong pinning model of domain walls of Gaunt (1983) [11]. Further insight into the magnetic properties of these alloys is gained from examining the behaviour of the demagnetization curve in the first quadrant, using a mean field interaction model. This enables determination of the behaviour of the saturation magnetization, anisotropy field and anisotropy constant for each alloy as a function of increasing dysprosium content. (C) 2012 Elsevier B.V. All rights reserved.