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首页> 外文期刊>Physical review >Probing the spin-glass freezing transition in Cu_(1-x)Mn_x alloy by spin current
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Probing the spin-glass freezing transition in Cu_(1-x)Mn_x alloy by spin current

机译：利用自旋电流探测Cu_（1-x）Mn_x合金的自旋玻璃冻结转变

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In this study, we used the thermally driven spin current to investigate the spin frustrations and spin fluctuations in spin-glass (SG) Cu_(1-x)Mn_x alloys. Tuning the Cu_(1-x)Mn_x composition results in a transition of the alloys from the SG state to the antiferromagnetic state; these states have different spin-freezing temperatures (T_f). Most spins randomly freeze at temperatures lower than the T_f of the alloy. For each alloy composition, we obtained a temperature-dependent inverse spin Hall voltage with a peak at T_p. Crucially, T_p had nearly identical composition dependence as that of T_f,, with T_p being nine times larger than T_f. Similar behavior was captured using the SG insulator, amorphous Y3Fe_5O_(12). These results indicated that the maximum spin fluctuation in both conducting and insulating SGs occurred at temperatures considerably higher than the T_f of each. In addition, we demonstrated the importance of the effective number of valence electrons in tailoring the spin Hall angle in binary alloys.
机译：在这项研究中，我们使用热驱动的自旋电流研究自旋玻璃（SG）Cu_（1-x）Mn_x合金的自旋失意和自旋波动。调整Cu_（1-x）Mn_x的组成会导致合金从SG状态转变为反铁磁状态;这些状态具有不同的自旋冻结温度（T_f）。大多数自旋在低于合金的T_f的温度下随机冻结。对于每种合金成分，我们获得了一个温度相关的逆自旋霍尔电压，其峰值在T_p处。至关重要的是，T_p具有与T_f几乎相同的成分依赖性，其中T_p比T_f大9倍。使用SG绝缘子非晶Y3Fe_5O_（12）可以捕获类似的行为。这些结果表明，导电SG和绝缘SG中的最大自旋波动发生在明显高于每个SG的T_f的温度下。此外，我们证明了价电子的有效数量对于调整二元合金中的自旋霍尔角的重要性。

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