Stabilization of magnetic skyrmions by uniaxial tensile strain
Stabilization of magnetic skyrmions by uniaxial tensile strain
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DOI：
10.1103/physrevb.96.220404
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发表时间：
2017-12
影响因子：
3.7
通讯作者：
S. Seki;Y. Okamura;K. Shibata;R. Takagi;N. Khanh;F. Kagawa;T. Arima;Y. Tokura
中科院分区：
文献类型：
--
作者：
S. Seki;Y. Okamura;K. Shibata;R. Takagi;N. Khanh;F. Kagawa;T. Arima;Y. Tokura
具有拓扑粒子性质的磁性Skyrmion作为新型磁存储器件的潜在信息载体，近年来引起了人们的广泛关注。对于单相块状晶体，skyrmions通常出现在一个非常窄的温度区域，低于磁有序温度Tc，和稳定的skyrmions更广泛的温度范围仍然是一个重要的挑战。在这里，通过研究单轴拉伸应力的手征磁体Cu 2 OSeO 3的影响，我们表明，只有不到0.2%的单轴伸长率可以显着稳定skyrmions的整个温度范围从Tc到最低温度。Skyrmions的稳定性本质上取决于应变方向、磁场方向和晶轴方向之间的几何关系，这可以用Dzyaloshinskiii-Moriya相互作用的各向异性调制和磁晶各向异性来解释。这一发现可为提高skyrmion稳定性的材料设计提供一个很好的策略。
Magnetic skyrmion with topological particle nature has recently attracted attention as a potential information carrier for novel magnetic storage device. For single-phase bulk crystals, skyrmions usually appear for a very narrow temperature region just below magnetic ordering temperature T c , and the stabilization of skyrmions for wider temperature range remains an important challenge. Here, by investigating the impact of uniaxial tensile stress for a chiral magnet Cu 2 OSeO 3 , we demonstrate that only less than 0.2% of uniaxial elongation can dramatically stabilize skyrmions for whole temperature range from T c to the lowest temperature. The stability of skyrmions essentially depends on the geometrical relationship among the directions of strain, magnetic field, and crystallographic axes, which is consistently explained in terms of the anisotropic modulation of Dzyaloshinskii-Moriya interaction and magnetocrystalline anisotropy. Our finding may provide a good strategy for materials design to enhance the skyrmion stability.