Thermal stability of non-collinear antiferromagnetic Mn3Sn nanodot
Thermal stability of non-collinear antiferromagnetic Mn3Sn nanodot
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DOI：
10.1063/5.0135709
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发表时间：
2023-03
影响因子：
4
通讯作者：
Yuma Sato;Y. Takeuchi;Y. Yamane;Juyoung Yoon;S. Kanai;J. Ieda;H. Ohno;S. Fukami
中科院分区：
文献类型：
--
作者：
Yuma Sato;Y. Takeuchi;Y. Yamane;Juyoung Yoon;S. Kanai;J. Ieda;H. Ohno;S. Fukami
D 019-Mn 3 Sn是一种在可果美晶格中具有非共线自旋结构的反铁磁物质，由于具有大的异常霍尔效应等各种有趣的性质而引起了人们的极大关注。磁态对热涨落的稳定性，一般用热稳定因子Δ来表征，在铁磁系统中已经得到了很好的研究，但在反铁磁体中还没有。在这里，我们研究了反铁磁Mn 3Sn纳米点的Δ作为其直径D的函数。为了量化Δ，我们测量了开关概率作为脉冲场幅度的函数，并基于一个模型分析了结果，该模型考虑了戈薇平面中的两个和六个磁各向异性。我们观察到Δ在D = 300 nm以下没有显著变化，低于该值时Δ随D减小。得到的D依赖性很好地解释了一个单域和成核介导的逆转模型。这些发现为理解反铁磁体的热涨落和反转机制提供了基础。
D019-Mn3Sn, an antiferromagnet having a non-collinear spin structure in a kagome lattice, has attracted great attention owing to various intriguing properties such as large anomalous Hall effect. Stability of a magnetic state against thermal fluctuation, characterized in general by the thermal stability factor Δ, has been well studied in ferromagnetic systems but not for antiferromagnets. Here, we study Δ of the antiferromagnetic Mn3Sn nanodots as a function of their diameter D. To quantify Δ, we measure the switching probability as a function of the pulse-field amplitude and analyze the results based on a model taking account of two and sixfold magnetic anisotropies in the kagome plane. We observe no significant change in Δ down to D = 300 nm below which it decreases with D. The obtained D dependence is well explained by a single-domain and nucleation-mediated reversal models. These findings provide a basis to understand the thermal fluctuation and reversal mechanism of antiferromagnets for device applications.