Parameterized tight-binding models of ferromagnetic bilayer manganites

ORAL

Abstract

Half-metallic behavior in materials has been a subject of extensive research due to its potential for applications in spintronics. Ferromagnetic manganites have been seen as a good candidate, and aside from a small minority-spin pocket observed in La$_{2-2x}$Sr$_{1+2x}$Mn$_{2}$O$_{7}$ ($x =$ 0.38), transport measurements show that ferromagnetic manganites essentially behave like half metals. Here we develop robust tight-binding models to describe the electronic band structure of the majority as well as minority spin states of ferromagnetic, spin-canted antiferromagnetic, and fully antiferromagnetic bilayer manganites. Both the bilayer coupling between the MnO$_{\mathrm{2}}$ planes and the mixing of the \textbar $x^{2} - y^{2}$ \textgreater\ and \textbar 3$z^{2}$ $- r^{}$ \textgreater\ Mn 3d orbitals play an important role in the subtle behavior of the bilayer splitting. Effects of $k_{z}$ dispersion are included.

–

Authors

  • M. Baublitz

    Boston University, Northeastern University

  • Christopher Lane

    College of the Holy Cross, Bridgewater State University, Brown University, Harvard University, University of Tennessee at Chattanooga, Boston College, Istanbul Technical University, Dartmouth College Physics and Radiology, Northeastern University, University of Colorado, Northeastern University, National University of Singapore

  • Christopher Lane

    College of the Holy Cross, Bridgewater State University, Brown University, Harvard University, University of Tennessee at Chattanooga, Boston College, Istanbul Technical University, Dartmouth College Physics and Radiology, Northeastern University, University of Colorado, Northeastern University, National University of Singapore

  • Christopher Lane

    College of the Holy Cross, Bridgewater State University, Brown University, Harvard University, University of Tennessee at Chattanooga, Boston College, Istanbul Technical University, Dartmouth College Physics and Radiology, Northeastern University, University of Colorado, Northeastern University, National University of Singapore

  • Christopher Lane

    College of the Holy Cross, Bridgewater State University, Brown University, Harvard University, University of Tennessee at Chattanooga, Boston College, Istanbul Technical University, Dartmouth College Physics and Radiology, Northeastern University, University of Colorado, Northeastern University, National University of Singapore

  • Christopher Lane

    College of the Holy Cross, Bridgewater State University, Brown University, Harvard University, University of Tennessee at Chattanooga, Boston College, Istanbul Technical University, Dartmouth College Physics and Radiology, Northeastern University, University of Colorado, Northeastern University, National University of Singapore

  • Christopher Lane

    College of the Holy Cross, Bridgewater State University, Brown University, Harvard University, University of Tennessee at Chattanooga, Boston College, Istanbul Technical University, Dartmouth College Physics and Radiology, Northeastern University, University of Colorado, Northeastern University, National University of Singapore

  • Christopher Lane

    College of the Holy Cross, Bridgewater State University, Brown University, Harvard University, University of Tennessee at Chattanooga, Boston College, Istanbul Technical University, Dartmouth College Physics and Radiology, Northeastern University, University of Colorado, Northeastern University, National University of Singapore

  • Christopher Lane

    College of the Holy Cross, Bridgewater State University, Brown University, Harvard University, University of Tennessee at Chattanooga, Boston College, Istanbul Technical University, Dartmouth College Physics and Radiology, Northeastern University, University of Colorado, Northeastern University, National University of Singapore