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Article
Transport Spin Polarization of High Curie Temperature MnBi Films
Physical Review B (2011)
  • P. Kharel, South Dakota State University
  • P. Thapa
  • Pavel Lukashev, University of Northern Iowa
  • R. F. Sabirianov
  • E. Y. Tsymbal
  • D.J. Sellmyer, University of Nebraska - Lincoln
  • B. Nadgorny
Abstract
We report on the study of the structural, magnetic, and transport properties of highly textured MnBi films with the Curie temperature of 628 K. In addition to detailed measurements of resistivity and magnetization, we measure transport spin polarization of MnBi by Andreev reflection spectroscopy and perform fully relativistic band-structure calculations of MnBi. A spin polarization from 51% ± 1%to 63% ± 1% is observed, consistent with the calculations and with an observation of a large magnetoresistance in MnBi contacts. The band-structure calculations indicate that in spite of almost identical densities of states at the Fermi energy, the large disparity in the Fermi velocities leads to high transport spin polarization of MnBi. The correlation between the values of magnetization and spin polarization is discussed.
Disciplines
Publication Date
January 31, 2011
DOI
http://dx.doi.org/10.1103/PhysRevB.83.024415
Citation Information
P. Kharel, P. Thapa, Pavel Lukashev, R. F. Sabirianov, et al.. "Transport Spin Polarization of High Curie Temperature MnBi Films" Physical Review B Vol. 83 Iss. 02 (2011)
Available at: http://works.bepress.com/pavel-lukashev/12/