Thermal stability of non-collinear antiferromagnetic Mn
Sn nanodot
ノンコリニア反強磁性体Mn
Snナノドットの熱安定性
佐藤 佑磨*; 竹内 祐太郎*; 山根 結太*; Yoon, J.-Y.*; 金井 駿*; 家田 淳一
; 大野 英男*; 深見 俊輔*
Sato, Yuma*; Takeuchi, Yutaro*; Yamane, Yuta*; Yoon, J.-Y.*; Kanai, Shun*; Ieda, Junichi; Ohno, Hideo*; Fukami, Shunsuke*
-Mn
Sn, 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 magnetic state against thermal fluctuation, characterized in general by the thermal stability factor
, has been well studied in ferromagnetic systems but not for antiferromagnets. Here we study
of the antiferromagnetic Mn
Sn nanodots as a function of their diameter
. To obtain
, we measure the switching probability as a function of pulse-field amplitude and analyze the results based on a model developed by accounting for two and six-fold magnetic anisotropies in the kagome plane. We observe no significant change in
down to
nm below which it decreases with
. The obtained
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 application.