X-ray magnetic circular dichroism and photoemission studies of ferromagnetism in CaMn1-xRuxO3 thin films
Abstract
We have studied the electronic and magnetic properties of epitaxially grown CaMn1-xRuxO3 thin films (x=1.0,0.75,0.5) by soft x-ray absorption, soft x-ray magnetic circular dichroism (XMCD), and hard x-ray photoemission spectroscopy (HXPES) measurements. The XMCD studies indicated that the spin moments of Mn and Ru are aligned in opposite directions. The valence-band HXPES spectra revealed that the Ru4d t2g states around the Fermi level and the Mn3d t2g up-spin states centered ∼2eV below it showed systematic concentration dependences. From these results, we propose that the localized Mn3d t2g states and the itinerant Ru4d t2g band are antiferromagnetically coupled and give rise to the ferromagnetic ordering, which is in analogy to the mechanism proposed for double perovskite oxides, such as Sr2FeMoO6 .
- Publication:
-
Physical Review B
- Pub Date:
- March 2008
- DOI:
- 10.1103/PhysRevB.77.115128
- Bibcode:
- 2008PhRvB..77k5128T
- Keywords:
-
- 75.47.Lx;
- 75.50.Cc;
- 75.70.-i;
- 78.70.Dm;
- Manganites;
- Other ferromagnetic metals and alloys;
- Magnetic properties of thin films surfaces and interfaces;
- X-ray absorption spectra