室温 磁性 Skyrmions 在梯度组成工程 CoPt 单层
Adam Erickson1, Qihan Zhang2, Hamed Vakili3
1Department of Mechanical & Materials Engineering, University of Nebraska-Lincoln, 900 N 16th Street, W342 NH, Lincoln, Nebraska 68588, United States.
ACS nano
|October 29, 2024
概括
研究人员在CoPt膜中使用梯度Dzyaloshinskii-Moriya相互作用 (g-DMI) 观察室温磁性 skyrmions. 这一突破为节能电子设备的潜在应用提供了机会.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
背景情况:
- 磁性 skyrmions 是由Dzyaloshinskii-Moriya相互作用 (DMI) 稳定的拓保护准粒子.
- 由于厚度依赖和低温要求,目前的DMI方法限制了 skyrmion应用.
- 室温 (RT) skyrmion操纵对于节能设备至关重要.
研究的目的:
- 为了证明通过梯度DMI (g-DMI) 稳定的RT磁性 skyrmions.
- 探索COPt单层薄膜的潜力,以容纳稳定的RT skyrmions.
- 调查调整DMI用于实际应用的方法.
主要方法:
- CoPt单层薄膜的组合梯度工程.
- 利用拓的霍尔效应,磁力显微镜和空扫描磁力计.
- 微磁模拟和分析磁化重建用于 skyrmion 的表征.
主要成果:
- 在梯度DMI CoPt膜中观察稳定的RT skyrmions.
- 证实Skyrmions几乎是布洛赫型,并且在广泛的磁场范围内稳定.
- 观察斯基尔米翁对,表明潜在的斯基尔米翁-抗斯基尔米翁相互作用.
结论:
- 梯度DMI是一种有效的策略,用于稳定RT磁性 skyrmions.
- CoPt单层薄膜是托管RT skyrmions的有希望的材料.
- 通过梯度极性和材料选择调整g-DMI扩大了RT skyrmion实现的可能性.
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