Magnetic properties of ferromagnetic Heusler alloy Co2NbGa

Magnetic properties of ferromagnetic Heusler alloy Co2NbGa
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铁磁霍斯勒合金Co2NbGa的磁性能

DOI:
10.1016/j.jmmm.2020.166604
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发表时间:
2020
影响因子:
2.7
通讯作者:
Shishido T.
Shishido T.
中科院分区:
材料科学3区
文献类型:
--
作者:
Kanomata T.;Nishihara H.;Osaki T.;Doi M.;Sakon T.;Adachi Y.;Kihara T.;Obara K.;Shishido T.

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化合物Co2 NbGa以Heusler型结构结晶。在常压下用SQUID磁强计测量了Co_2NbGa的磁化强度。在5 K下的自发磁矩和居里温度为1.81 μB/f. u。351 K,分别。用Takahashi自旋涨落理论解释了巡游电子铁磁体的许多磁性。在Takahashi的自旋涨落理论中,自旋涨落的谱参数T_0和T_A涉及到理论推导的各种磁性。在本工作中,我们利用5 K下的磁化强度测量结果估算了Co_2NbGa的T_0和TA:T_0 = 2.1 × 103 K,TA = 4.7 × 103 K。实验证明了低温下自发磁化强度的平方Ms(T)2与T 2成正比。由Ms(T)_2vs.T_2曲线估算TA值为6.6 × 103 K。在低磁场区,TC附近的场致磁化强度M_4与H/Min成正比。
The compound Co2NbGa crystallizes in the Heusler-type structure. Magnetization measurements of Co2NbGa have been made under ambient pressure using a SQUID magnetometer. The spontaneous magnetic moment at 5 K and the Curie temperature are 1.81 μB/f.u. and 351 K, respectively. Many magnetic properties of the itinerant electron ferromagnets are explained by the Takahashi’s spin fluctuation theory. In the Takahashi’s spin fluctuation theory, spectral parameters of spin fluctuations,T0andTA, are involved in various magnetic properties derived theoretically. In this work, we estimatedT0andTAof Co2NbGa by using the results of magnetization measurements at 5 K:T0= 2.1 × 103K andTA= 4.7 × 103K. This experiment proved that the squared spontaneous magnetizationMs(T)2is proportional toT2at low temperature. TheTAvalue estimated from theMs(T)2vs.T2curve is 6.6 × 103K. Furthermore, the field-induced magnetizationM4aroundTCis found to be proportional toH/Min the low magnetic field region.
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