Electronic and magnetic structures of double perovskite multifunctional La$_{2}$NiMnO$_{6}$ thin films
ORAL
Abstract
Electronic and magnetic structures of the ordered double perovskite La$_{2}$NiMnO$_{6}$ (LNMO) thin films grown by pulsed laser deposition have been studied by x-ray absorption spectroscopy (XAS) and magnetic circular dichroism spectroscopy (XMCD). Based upon the results of XMCD, we find that the primary ion valence states to be Mn$^{4+}$/Ni$^{2+}$, and the ferromagnetism resulting from Mn$^{4+}$ -O - Ni$^{2+}$ superexchange interaction. Additionally, we show that the LNMO samples contain some Mn$^{3+}$ and Ni$^{3+}$ Jahn-Teller ions caused by oxygen or cation related defects. The orbital and spin magnetic moments of the Mn 3$d $and Ni 3$d $also have been deduced from the magneto-optical sum rules and compared with magnetization measurements.
*Supported by NSF DMR-0346826, NSF NIRT Grant No. CMS-0609377, and DOE DE-FG02-04ER46125.
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Authors
Haizhong Guo
Department of Physics, Florida International University, Miami, FL 33199
Jiandi Zhang
Department of Physics, Florida International University, Miami, FL 33199
Florida International University, Miami, FL 33199
Florida International University
Florida International University (FIU), Miami, FL 33199
Arunava Gupta
University of Alabama
Univ. of Alabama
MINT Center and Department of Chemistry, University of Alabama
Center for Materials for Information Technology and Department of Chemistry, University of Alabama, Tuscaloosa, Alabama 35487
Center for Materials for Information Technology
M. Varela
Mat. Sci. and Tech. Div., Oak Ridge Nat. Lab., Oak Ridge, TN
Oak Ridge National Laboratory
Oak Ridge National Lab
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
S.J. Pennycook
Oak Ridge National Laboratory
Oak Ridge National Lab
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
