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We report the formation of a novel ferromagnetic state in the antiferromagnet at the interface with ferromagnet . Using x-ray magnetic circular dichroism at Mn and Fe edges, we discovered that the development of this ferromagnetic spin structure is strongly associated with the onset of a significant exchange bias. Our results demonstrate that the magnetic state is directly related to an electronic orbital reconstruction at the interface, which is supported by the linearly polarized x-ray absorption measurement at the oxygen  edge.