Angular-dependence of magnetization switching for a multi-domain dot: experiment and simulation

Olivier Fruchart (1) , Jean-Christophe Toussaint (1) , Pierre-Olivier Jubert (1) , Wolfgang Wernsdorfer (1) , Riccardo Hertel (1, 2) , Dominique Mailly (3) , Jürgen Kirschner (2)

1 LLN - Laboratoire Louis Néel
2 MPI-HALLE - Max-Planck-Institut für Mikrostrukturphysik
3 LPN - Laboratoire de photonique et de nanostructures

We have measured the in-plane angular variation of nucleation and annihilation fields of a multi-domain magnetic single dot with a microsquid. The dots are Fe/Mo(110) self-assembled in UHV, with sub-micron size and a hexagonal shape. The angular variations were quantitatively reproduced by micromagnetic simulations. Discontinuities in the variations are observed, and shown to result from bifurcations related to the interplay of the non-uniform magnetization state with the shape of the dot.

Mots clés: Magnetic vortex; Magnetic domain; Single particle Measurement; Magnetization reversal; Micromagnetism; micro-SQUID; Magnetic wall

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Olivier Fruchart, Jean-Christophe Toussaint, Pierre-Olivier Jubert, Wolfgang Wernsdorfer, Riccardo Hertel, et al.. Angular-dependence of magnetization switching for a multi-domain dot: experiment and simulation. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2004, 70, pp.R172409. ⟨10.1103/PhysRevB.70.172409⟩. ⟨hal-00004736⟩