Ferromagnetic resonance force spectroscopy of individual submicron-size samples
Ferromagnetic resonance force spectroscopy of individual submicron-size samples
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DOI：
10.1103/physrevb.78.144410
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发表时间：
2008-10-01
影响因子：
3.7
通讯作者：
Vukadinovic, N.
中科院分区：
文献类型：
--
作者：
Klein, O.;de Loubens, G.;Vukadinovic, N.
我们回顾如何磁共振力显微镜（MRFM）可以应用于执行个别亚微米尺寸的样品的铁磁共振光谱。我们限制我们的注意力到一个彻底的研究的自旋波本征模激发坡莫合金（Py）磁盘图案出相同的43.3 nm薄膜。磁盘的直径为1.0或0.5 μ m，并通过垂直施加的磁场准饱和。结果表明，定量光谱信息可以从MRFM测量提取。特别是，数据进行了广泛的比较与互补的近似模型的动态磁化率：（i）二维分析模型，其假设沿厚度沿着的均匀磁化动力学，以及ii）全三维微磁模拟，其假定在特征长度尺度C以下的均匀磁化动力学横向尺寸c= 3.9nm的立方体网格。在我们的分析中，由于轴对称性的破坏的扭曲被考虑在内;两个模型都包含了所施加的场和正常的磁盘之间的小错位的可能性。
We review how a magnetic-resonance force microscope (MRFM) can be applied to perform ferromagnetic resonance spectroscopy of individual submicron-size samples. We restrict our attention to a thorough study of the spin-wave eigenmodes excited in Permalloy (Py) disks patterned out of the same 43.3-nm-thin film. The disks have a diameter of either 1.0 or 0.5 mu m and are quasisaturated by a perpendicularly applied magnetic field. It is shown that quantitative spectroscopic information can be extracted from the MRFM measurements. In particular, the data are extensively compared with complementary approximate models of the dynamical susceptibility: (i) a two-dimensional analytical model, which assumes a homogeneous magnetization dynamics along the thickness, and ii) a full three-dimensional micromagnetic simulation, which assumes a homogeneous magnetization dynamics below a characteristic length scale c and approximates the cylindrical sample volume by a discretized representation with regular cubic mesh of lateral size c=3.9 nm. In our analysis, the distortions due to a breaking of the axial symmetry are taken into account; both models incorporating the possibility of a small misalignment between the applied field and the normal of the disks.