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Sketch of experimental setup and sample. Linearly s- polarized light impinges on the sample at an angle of incidence of 45°. Using two lenses and with focal length and the polarization analyzer , the spatially resolved MOKE signal is recorded with a CCD-camera. The external magnetic field is applied along the axis orthogonal to the current . The magnetoresistance is recorded in a four point measurement between the indicated contact pads. denotes the magnetization orientation with respect to the axis.
Selected spatially resolved MOKE images. Images 1–4 were taken during the magnetic field upsweep and images 5–7 during the downsweep at the indicated values of . For each image, the solid arrow indicates the respective orientation and magnitude. The shading represents the -orientation in each domain, as indicated in the lower right. We observe domains with orientated along the e.a. along (dashed) and the e.a. along (dotted).
(a) MOKE intensity integrated over the entire Hall bar and normalized to [−1,1] as a function of . The numbers correspond to the MOKE images shown in Fig. 2. (b) Normalized integrated over the indicated ROI. The two-step magnetic switching characteristic of cubic magnetic anisotropy is clearly evident from the data.
(a) orientation calculated from the integral MOKE intensity in the indicated region of interest. (b) The AMR calculated from perfectly traces the experimentally observed .
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