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arXiv · 1512.00621

Dynamic cantilever magnetometry of individual CoFeB nanotubes

B. Gross·D. P. Weber·D. Rüffer·A. Buchter·F. Heimbach·A. Fontcuberta i Morral·D. Grundler·M. Poggio
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Abstract

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 show the presence of a uniformly magnetized configuration at high external fields with $μ_0 M_s =1.3 \pm 0.1$ T and non-uniform 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

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B. Gross, D. P. Weber, D. Rüffer, A. Buchter, F. Heimbach, A. Fontcuberta i Morral, D. Grundler, M. Poggio. 2015-12-02. Dynamic cantilever magnetometry of individual CoFeB nanotubes. https://doi.org/10.1103/physrevb.93.064409

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