Dynamic cantilever magnetometry of individual CoFeB nanotubes
Dynamic cantilever magnetometry of individual CoFeB nanotubes
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DOI：
10.1103/physrevb.93.064409
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发表时间：
2016-02-05
影响因子：
3.7
通讯作者：
Poggio, M.
中科院分区：
文献类型：
--
作者：
Gross, B.;Weber, D. P.;Poggio, M.
我们研究了单一的CoFeB纳米管与六边形的横截面，使用动态悬臂梁磁强计（DCM）。我们开发了一个基于Stoner-Wohlfarth近似的分析模型和一个广泛适用的数值框架，用于分析磁性纳米结构的DCM测量。在4.2 K下测得的磁性数据表明，在高外场下存在均匀磁化的配置，μ M-0（s）= 1.3 +/- 0.1 T，在低场下存在不均匀的配置。在这种低场制度，数值模拟和DCM测量之间的比较支持磁通封闭配置的存在。至关重要的是，这样的配置的证据是显而易见的，因为DCM的灵敏度，以单一的纳米管，而传统的测量合奏往往是模糊的样品到样品的大小，形状和取向的不均匀性。
We investigate single CoFeB nanotubes with hexagonal cross section using dynamic cantilever magnetometry (DCM). We develop both an analytical model based on the Stoner-Wohlfarth approximation and a broadly applicable numerical framework for analyzing DCM measurements of magnetic nanostructures. Magnetometry data taken at 4.2 K show the presence of a uniformly magnetized configuration at high external fields with mu M-0(s) = 1.3 +/- 0.1 T and nonuniform configurations at low fields. In this low-field regime, comparison between numerical simulations and DCM measurements supports the existence of flux-closure configurations. Crucially, evidence of such configurations is only apparent because of the sensitivity of DCM to single nanotubes, whereas conventional measurements of ensembles are often obscured by sample-to-sample inhomogeneities in size, shape, and orientation.