通过Pd单层封装来定制Co电影的旋转重定向过渡
Benito Santos Burgos1, Raúl López-Martín1, José A De Toro1
1Instituto Regional de Investigación Científica Aplicada (IRICA) and Departamento de Física Aplicada, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain.
Nanomaterials (Basel, Switzerland)
|October 25, 2024
概括
在 (Ru) 上的超薄 (Co) 薄膜上添加一个 (Pd) 层可以改变它们的磁对齐. 这种由表面异质性驱动的效应在3~4个原子层的中被观察到,但在5个原子层中没有.
科学领域:
- 材料科学 材料科学 材料科学
- 表面科学是一门学科.
- 磁力学 磁力学 是一种
背景情况:
- 超薄磁具有独特的特性,取决于其厚度和基板.
- 控制磁性异构性 (易轴) 对于自旋电子器件应用至关重要.
- (Ru(0001) 上的 (Co) 薄膜是研究界面磁性的模型系统.
研究的目的:
- 为了研究 (Pd) 封闭层对在Ru(0001) 上培养的超薄Co薄膜的磁性轻轴的影响.
- 为了确定Co薄膜厚度 (2-5个原子层,AL) 对Pd封闭诱导的磁性异性变化的影响.
- 了解表面异构性在观察到的磁性重定向现象中的作用.
主要方法:
- 在Ru(0001) 基板上制造超薄的Co薄膜 (2-5AL),使用分子束表.
- 用Pd的单层覆盖Co薄膜.
- 使用对磁性异质性敏感的技术 (例如,磁光学克尔效应) 对磁化易轴的表征.
- 用 (H2) 和一氧化碳 (CO) 气体进行暴露研究,以评估它们对磁对齐的影响.
主要成果:
- 一个Pd单层封装诱导了3和4个AL厚的Co薄膜从平面内到平面外的磁化对齐的过渡.
- 5AL厚的Co薄膜在Pd封装时没有表现出这种磁性重定位.
- 观察到的变化归因于在Co-Pd接口的增强的表面异构性.
- 暴露于H2,CO或它们的组合并没有逆转由Pd层诱导的外平面磁化.
结论:
- 封盖是一种有效的方法来调整Ru上的特定超薄Co薄膜的磁性异性质.
- 这种依赖厚度的反应突出显示了对磁性异构的界面和体积贡献的微妙平衡.
- 表面异质性在观察到的磁性重定向中起着主导作用,这种磁性重定向对常见气体暴露具有强度.
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