Abstract
We report coherent magnetization reversal in the La0.7Ca0.3MnO3/NdGaO3/La0.7Ca0.3MnO3 tunnel junctions probed by spin-polarized tunneling. The junction resistance shows an extremely sharp switching with distinct binary resistances and its two-dimensional angular dependence reveals two different magnetic anisotropies in play in the top and bottom La0.7Ca0.3MnO3 electrodes. The large bottom electrode (50×2000 μm) shows the effective twofold crystalline anisotropy and the top electrode (6×6 μm) shows an additional fourfold anisotropy. The geometrical expression of the switching fields in two-dimensional polar coordinates provides evidence that the coherent magnetization reversal of the junctions, particularly the top electrode, closely resembles the ideal coherent rotation model.
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