文摘
We have studied the electronic and magnetic properties of epitaxially grown CaMn1-xRuxO3 (x=1.0, 0.5) thin films by X-ray magnetic circular dichroism (XMCD) and hard X-ray photoemission spectroscopy (HXPES). The XMCD studies indicated that the spin moments of Mn and Ru are aligned in the opposite directions. The HXPES spectra indicated the Ru 4d states at around the Fermi edge (EF) and the Mn 3d states below EF. From these results, we propose that the localized Mn 3d t2g states and the itinerant Ru 4d t2g band are antiferromagnetically coupled and give rise to ferromagnetism, in analogy with the mechanism proposed for the double perovskite oxides such as Sr2FeMoO6.