Transport spin polarization of high Curie temperature MnBi films

P. Kharel, P. Thapa, P. Lukashev, R. F. Sabirianov, E. Y. Tsymbal, D. J. Sellmyer, B. Nadgorny

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

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.

Original languageEnglish (US)
Article number024415
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number2
DOIs
StatePublished - Jan 31 2011

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Transport spin polarization of high Curie temperature MnBi films'. Together they form a unique fingerprint.

Cite this