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Magnetization dynamics of a grain studied by micro-Hall magnetometry
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View: Figures


Image of FIG. 1.
FIG. 1.

Hysteresis loops measured for magnetic fields applied almost parallel and perpendicular to the EMD. Lower right inset: SEM image of the grain placed between two Hall crosses (labeled 1 and 2). Upper left inset: Barkhausen jumps corresponding to the displacement of a single domain wall.

Image of FIG. 2.
FIG. 2.

(a) Easy-axis hysteresis loops simultaneously measured at two grain ends (crosses 1 and 2) at . The sweep direction is indicated by the arrows. The apparent negative remanence (see also Fig. 1 ) is due to the specific nature of the stray field to which our Hall crosses respond. The different regimes A and B of magnetization reversal (indicated by the shaded areas) correspond to different domain configurations, see Fig. 3 . (b) Magnification of the hysteresis loops in regions A and B . The jumps at the grain ends are strictly correlated within regime B. In contrast, jumps are mostly uncorrelated for regime A (jumps without counterpart are highlighted by question marks).

Image of FIG. 3.
FIG. 3.

Results of micromagnetic simulations. The figures show one of the two surfaces of the grain in the -plane. One arrow corresponds to approximately 6 unit cells of discretization. The different domain configurations A and B correspond to the different magnetization regimes shown in Fig. 2 .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetization dynamics of a CrO2 grain studied by micro-Hall magnetometry