纳米级混合Nel-Bloch-Néel域壁中的非互惠的旋转波通过扫描X射线显微镜检测到垂直的磁性无异型Fe/Gd多层中
Ping Che1, Axel J M Deenen1, Andrea Mucchietto1
1Laboratory of Nanoscale Magnetic Materials and Magnonics, Institute of Materials (IMX), École Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland.
Advanced materials (Deerfield Beach, Fla.)
|August 4, 2025
概括
磁多层中的域壁可以为磁性电路提供非互惠的自旋波. 这项研究使用STXM观察混合Néel-Bloch-Néel域壁中的这些自旋波,证实了它们对定向信息流的潜力.
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:
- 旋波非互惠性对于磁性电路中的信号处理至关重要.
- 域壁 (DWs) 是对具有定向性质的非互惠自旋波 (magnons) 的拟议通道.
- 由于材料和纳米尺度的要求,在DW中对磁子的实验研究具有挑战性.
研究的目的:
- 实验性地研究在混合的 Néel-Bloch-Néel DWs 中传播的连贯激发的磁子.
- 在无形Fe/Gd多层DW中检查非互惠的马格农带结构.
- 提供DW中非互惠自旋波的直接证据,以便在磁装置中潜在使用.
主要方法:
- 利用扫描传输X射线显微镜 (STXM) 研究磁传播.
- 使用纳米线阵列制造的无形Fe/Gd多层与垂直磁性异构 (PMA) 的混合DWs.
- 进行微磁模拟以补充实验数据.
主要成果:
- 检测到波长低至281nm的1GHz磁子,在DWs (宽度~60nm) 内的道.
- STXM数据显示DWs内部有一个非互惠的马格农波段结构,与模拟相一致.
- 确定了扰乱马格农相演变并诱导局部波长变化的布洛赫点.
结论:
- 在PMA材料中提供了混合Neel-Bloch-Neel DWs中非互惠的旋转波的直接实验证据.
- 证明这些DW可以作为可编程的波导,用于磁性设备中的定向信息流.
- 突出了DWs在磁力学中先进的信号处理应用中的潜力.
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