High-field magnetization process and spin reorientation in (Nd1-xDyx)2Fe14B single crystals.
High-field magnetization process and spin reorientation in (Nd1-xDyx)2Fe14B single crystals.
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(Nd1-xDyx)2Fe14B 单晶的高场磁化过程和自旋重定向。
DOI：
10.1103/physrevb.44.10014
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
Nakagawa
中科院分区：
文献类型：
--
作者：
Lim;Kato;Yamada;Kido;Nakagawa
用x=0.125，0.2，0.2，0.33，0.47，0.6，使用混合磁体系统产生的高达300kOe的稳定磁场和高达400kOe的脉冲磁场进行磁化测量。当在低温下沿[10 0]方向施加磁场时，x=0.125、0.2、0.3 3的样品和x=0的样品中观察到了一级磁化过程。发现发生FOMP的磁场随着x的增加而迅速增加，当x=0.33时，在4.2K时达到320Koe。由交流磁化率测量确定了自旋重取向温度(${\mathit{T}}{\mathit{SR}}$)，低于该温度时，磁矩从[001]向[110]方向倾斜。该混合体系的磁化强度随x的增加而减小，4.2K时的倾斜角随x的增加而逐渐减小。通过假定两个端元的结晶电场参数，计算了该混合体系的磁化曲线。通过这个简单的计算，成功地再现了观测到的{\mathit{H}}_{\mathit{j}}的浓度依赖关系，以及磁化强度曲线。
The high-field magnetization process in the (${\mathrm{Nd}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Dy}}_{\mathit{x}}$${)}_{2}$${\mathrm{Fe}}_{14}$B system has been investigated using single crystals with x=0, 0.125, 0.2, 0.33, 0.47, 0.6, and 1. Magnetization measurements were performed using steady magnetic fields of up to 300 kOe generated by a hybrid magnet system and pulsed magnetic fields of up to 400 kOe. When the field was applied along the [100] direction at low temperatures, the first-order magnetization process (FOMP) was observed in the samples with x=0.125, 0.2, and 0.33 as well as in ${\mathrm{Nd}}_{2}$${\mathrm{Fe}}_{14}$B (x=0). The field ${\mathit{H}}_{\mathit{j}}$ where the FOMP occurred was found to increase rapidly with increasing x, reaching 320 kOe for the sample with x=0.33 at 4.2 K. The spin-reorientation temperature (${\mathit{T}}_{\mathrm{SR}}$), below which the magnetic moment tilted from the [001] to the [110] direction, was determined from ac susceptibility measurements. The ${\mathit{T}}_{\mathrm{SR}}$ decreased with increasing x. The tilting angle \ensuremath{\theta} at 4.2 K also decreased gradually with increasing x. Magnetization curves of this mixed system were calculated by assuming the crystalline-electric-field parameters for the two end members. The observed concentration dependence of ${\mathit{H}}_{\mathit{j}}$ and \ensuremath{\theta} as well as the magnetization curves were successfully reproduced by this simple calculation.