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We report the formation of new ferromagnetic (FM) states in antiferromagnetic (AFM) NiO at the interface with FM La0.7Ca0.3MnO3 (LCMO). The LCMO/NiO heterostructures exhibit an exchange bias field of 209Oe that vanishes as the temperature rises above 90K. A new magnetization temperature at 90K is observed and can be ascribed to Ni3+-O-Mn3+ superexchange interactions. Mn 3s and Ni 3p core-level spectra,...
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