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Temperature dependence of exchange stiffness in an off-stoichiometric Ni_2MnIn Heusler alloy

机译:化学计量比为Ni_2MnIn Heusler合金中交换刚度的温度依赖性

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摘要

Ferromagnetic exchange stiffness is a key to describe the robustness of a ferromagnetic interaction. Because the experimental determination of the exchange stiffness constant A continues to be elusive, especially at elevated temperatures, micromagnetic insights on the impact of thermal fluctuations on the ferromagnetic spin order have remained less tractable. In this study, the temperature dependence of A is experimentally determined for a Ni_2Mn_(0.8)In_(1.2) single crystal by measuring the 180 domain-wall width using off-axis electron holography and magnetocrystalline anisotropy. The theoretically expected power-law scaling with magnetization for A is shown to be applicable only in the low-temperature region (approximately half of the Curie temperature), and A starts to follow the power law with a significantly larger scaling exponent in the higher-temperature region. The decremental trends in the domain-wall width and the exchange length at elevated temperature seem to be attributed to this temperature dependence of A.
机译:铁磁交换刚度是描述铁磁相互作用的鲁棒性的关键。由于交换刚度常数A的实验确定仍然难以捉摸,尤其是在升高的温度下,因此关于热涨落对铁磁自旋阶数的影响的微磁洞察力仍然难以解决。在这项研究中,通过使用轴外电子全息法和磁晶各向异性测量180°畴壁宽度,通过实验确定了Ni_2Mn_(0.8)In_(1.2)单晶的A的温度依赖性。理论上期望的A随磁化的幂定律标度仅适用于低温区域(居里温度的一半左右),并且A开始遵循幂定律,在更高的温度范围内标度指数明显更大。温度区域。高温下畴壁宽度和交换长度的递减趋势似乎归因于A的这种温度依赖性。

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  • 来源
    《Physical review》 |2020年第1期|014443.1-014443.6|共6页
  • 作者单位

    Department of Materials Science & Engineering Kyoto University Sakyo-ku Kyoto 606-8501 Japan RIKEN Center for Emergent Matter Science (CEMS) Wako 351-0198 Japan;

    Department of Materials Science Graduate School of Engineering Tohoku University Sendai 980-8579 Japan;

    Institute for Materials Research Tohoku University Sendai 980-8577 Japan;

    RIKEN Center for Emergent Matter Science (CEMS) Wako 351-0198 Japan;

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