Magnetic properties of random-anisotropy amorphous magnets (RxFe1−x)80Si12B8 with R=Pr, Nd, Sm, Tb, Dy and Er
Magnetic properties of random-anisotropy amorphous magnets (RxFe1−x)80Si12B8 with R=Pr, Nd, Sm, Tb, Dy and Er
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DOI：
10.1016/s0304-8853(98)00285-6
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发表时间：
1998-11
影响因子：
2.7
通讯作者：
H. Kato;N. Kurita;Y. Ando;T. Miyazaki;M. Motokawa
中科院分区：
文献类型：
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作者：
H. Kato;N. Kurita;Y. Ando;T. Miyazaki;M. Motokawa
通过Mössbauer吸收和磁化测量，系统地研究了R=Pr, Nd, Sm, Tb， Dy和Er（0.1≤x≤1.0）的快速淬火非晶合金（RxFe1−x） 80si12b8在高达300kOe的磁场中的磁性能。Mössbauer实验表明，平均铁磁矩随着x的增加而迅速减小。在所有富r样品中，低磁场测量显示出低温下自旋冻结行为。冻结温度随磁场强度h的增大而迅速降低，低温下高磁场磁化等温线表现出较大的滞后，其中矫顽力场h随温度的降低而迅速增大。在H - T空间中，Hc(T)和Tf(H)的谱线几乎相同，因此被认为是磁相图中可逆区和不可逆区之间的边界。在R=Tb和Dy样品中，当x=0.2时，高场强磁化曲线呈上凹形，数值计算表明，这是高场强磁化向低场强磁化转变的开始阶段。
Magnetic properties of rapidly quenched amorphous alloys (RxFe1−x)80Si12B8with R=Pr, Nd, Sm, Tb, Dy and Er (0.1⩽x⩽1.0) have been investigated systematically by Mössbauer absorption and magnetization measurements in fields of up to 300kOe. Mössbauer experiments have shown that the averaged Fe magnetic moment decreases rapidly with increasing x. Low-field magnetic measurements have exhibited a spin-freezing behavior at low temperatures in all R-rich samples. The freezing temperature Tfrapidly decreases with increasing magnitude of magnetic field H. High-field magnetization isotherms at low temperatures showed a large hysteresis, in which the coercive field Hcincreases rapidly with decreasing temperature. In H–T space, the lines of Hc(T) and Tf(H) are found to be almost identical, which have therefore been regarded as a boundary between reversible and irreversible regions in the magnetic phase diagram. Upward concavity in the high-field magnetization curve has been observed in R=Tb and Dy samples with x=0.2, which was suggested to be an incipient stage of a transition from sperimagnetic to asperomagnetic state, based on the numerical calculations.