Tuesday 18 July 2017

Vortices in ferromagnetic nanotubes

Imaging magnetic vortex configurations in ferromagnetic nanotubes.
M. Wyss, A. Mehlin, B. Gross, A. Buchter, A. Farhan, M. Buzzi, A. Kleibert, G. Tütüncüoglu, F. Heimbach, A. Fontcuberta i Morral, D. Grundler, and M. Poggio

Phys. Rev. B 96, 024423 (2017)
XMCD-PEEM images of a 6.9-μm-long Py NT with (a) ˆkˆn and (b) ˆkˆn and of a 7.2-μm-long CoFeB NT with (c) ˆkˆn and (d) ˆkˆn. Dashed outlines indicate the positions of the NTs. Panels (e–h) represent 2-μm-long IXMCDlinecuts along the corresponding colored dashed lines in (a–d). In the linecuts, the background intensity is indicated by the level of the horizontal dashed lines and vertical dashed lines delineate the boundaries of the NT. Panels (i) and (j) show simulated remnant magnetic states for a NT with l=2.1μm and d=245 nm. Both configurations are mixed states with an axial central domain and vortex ends of either (i) opposing circulation—consistent with (a) and (b)—or (j) matching circulation—consistent with (c) and (d). The color scale corresponds to normalized magnetization along ˆy. Arrowheads indicate the local magnetization direction.


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