Abstract
We have fabricated the epitaxial thin films of La1−xSrxMn1−yRuyO3 (x=0.4, y=0, 0.05, and 0.1) with an atomically flat surface by a pulsed-laser deposition method. The Ru doping enhances the coercive field from 40Oe (y=0) to 300Oe (y=0.05) and 600Oe (y=0.1) at 5K. The moderate Ru doping (y=0.05) even increases the ferromagnetic transition temperature from 340to355K, while hardly affecting the highly metallic conductivity. In these remarkable features, important roles may be played by the charge-transfer reaction of Mn4++Ru4+→Mn3++Ru5+, where Mn ferromagnetic spins are coupled antiferromagnetically with Ru spins showing a large single-ion anisotropy.
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