Abstract

Anomalous hysteresis loops measured by longitudinal and polar magneto-optical Kerr effects (MOKE) were observed in a Co∕NiO∕Cu∕Co∕Cu structure. After excluding other possible mechanisms, we explain the anomalous hysteresis loops in terms of the opposite rotation angles for the top- and bottom-Co layers. Ultimately, the opposite rotation angles are likely caused by the different incidence angles for the top- and bottom-Co layers.

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