在3D波纹磁性薄膜中稳定的反平行域
Rafael Delgado-García1, Ruben Guerrero1, Gabriel Rodríguez-Rodríguez1
1Instituto de Nanociencia, Nanotecnología y Materiales Moleculares - INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III s/n, Toledo, 45071, Spain. rafael.delgado@uclm.es.
Nanoscale
|February 17, 2025
概括
我们使用磁光克尔效应 (MOKE) 显微镜揭示波纹永久合金薄膜中的不寻常的磁纹. 不同的光波长突出了不同的磁域模式,有助于3D磁性材料的表征.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 磁力学 磁力学 是一种
背景情况:
- 纳米结构材料中的3D磁纹在非传统计算和磁场传感等应用中至关重要.
- 由于纳米结构几何学引起的光学现象,对这些复杂的磁性结构进行表征具有挑战性.
研究的目的:
- 为了研究一个铁磁薄膜沉积在纳米上磁化和磁光学特性.
- 了解纳米格子的地形如何影响磁纹和磁光克尔效应 (MOKE) 信号.
- 开发一种方法来表征3D波纹材料中的子波长磁性特征.
主要方法:
- 将连续常态合金薄膜沉积在三角形纳米上,周期为250nm,振幅为180nm.
- 使用红色 (亚波长) 和紫色 (衍射) 光模式进行磁光学克尔效应 (MOKE) 测量.
- 光学建模和微磁模拟.
- 磁力显微镜 (MFM) 用于实验验证.
主要成果:
- 纳米引发了不寻常的磁纹,其特征小于光波长.
- 紫色光激发表面等离子极子,使横向的克尔信号增强一个数量级,并与红色光相比逆转了纵向的克尔信号.
- 光学建模揭示了空间不均的MOKE,根据照明模式定位在不同的格子区域.
- 表面MOKE测量显示一个单一的轻轴和消失的强制场对称地围绕硬轴,与反平行磁域一致.
- 磁力显微镜证实了纳米周期磁域模式.
结论:
- 纳米结构几何和光相互作用之间的相互作用显著影响MOKE测量.
- 使用不同的光学模式 (红色与紫色光) 允许解和表征复杂的3D磁纹和域逆转.
- 这种方法为瓦纳米结构材料的详细磁性特征提供了一条新的途径.
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