Griffiths phase and spontaneous magnetization in polycrystalline Co50V34Ga16 alloy
Griffiths phase and spontaneous magnetization in polycrystalline Co50V34Ga16 alloy
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DOI：
10.1016/j.jallcom.2021.159421
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发表时间：
2021-07
影响因子：
6.2
通讯作者：
Yuetong Qian;Meng Wu;Litao Yu;Hongwei Liu;Xiaodong Si;Xiaojing Luo;Zhe Li;C. Cai;Yongsheng Liu
中科院分区：
文献类型：
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作者：
Yuetong Qian;Meng Wu;Litao Yu;Hongwei Liu;Xiaodong Si;Xiaojing Luo;Zhe Li;C. Cai;Yongsheng Liu
本文采用定向凝固技术合成了Co50V34Ga16合金。有趣的是，首次在Co-V-Ga合金中发现了Griffiths相。利用高温区的差示扫描量热曲线和反直流磁化率(χ−-1)，自发磁化强度揭示了高温区存在Griffiths相。然后，根据Arrott图，确定了相变温度附近的相变。在修正形式的Bean-Rodbell模型中，考虑了具有可压缩性、自旋和自旋密度的形状记忆合金材料，定义了参数ε为0.26，(ε<；d1)，进一步确定了TC附近的转变类型。在低温下，用自旋波激发(海森堡铁磁型)研究了自发磁化强度对温度的依赖关系，从而研究了半金属性质。
In this work, we synthesized the Co50V34Ga16alloy by directional solidification technique. Interestingly, the Griffiths phase was found in Co-V-Ga alloy for the first time. Using the DSC curve and the inverse DC susceptibility (χ−1) in the high temperature region, the spontaneous magnetization revealed the existence of Griffiths phase in the high temperature region. And then, according to Arrott plot, the phase transition was determined around theTC. Modified form of the Bean-Rodbell model, considering a shape memory alloy material with compressibility, spin and spin density, one defines the parameterε, which is 0.26, (ε< 1), further confirmed the transition type aroundTC. At low temperature, spin wave excitation (Heisenberg ferromagnetic type) was used to study the dependence of spontaneous magnetization on temperature to investigate half metallicity.