Asymmetric hysteresis of Néel caps in flux-closure magnetic dots

Abstract : We investigated with XMCD-PEEM magnetic imaging the magnetization reversal processes of Néel caps inside Bloch walls in self-assembled, micron-sized Fe(110) dots with flux-closure magnetic state. In most cases the magnetic-dependent processes are symmetric in field, as expected. However, some dots show pronounced asymmetric behaviors. Micromagnetic simulations suggest that the geometrical features (and their asymmetry) of the dots strongly affect the switching mechanism of the Néel caps.
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Submitted on : Friday, October 30, 2009 - 11:45:50 PM
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Olivier Fruchart, Nicolas Rougemaille, Azzedine Bendounan, Jean-Christophe Toussaint, Rachid Belkhou, et al.. Asymmetric hysteresis of Néel caps in flux-closure magnetic dots. IEEE Transactions on Magnetics, Institute of Electrical and Electronics Engineers, 2010, 46 (6), pp.1552. ⟨10.1109/TMAG.2010.2043222⟩. ⟨hal-00429130⟩

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