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 journalArticle

33 Citations (Scopus)

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

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Spin polarization
Curie temperature
polarization
Band structure
Magnetization
magnetization
Magnetoresistance
Fermi level
Transport properties
Structural properties
Magnetic properties
transport properties
Spectroscopy
magnetic properties
electrical resistivity
spectroscopy
energy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Transport spin polarization of high Curie temperature MnBi films. / Kharel, P.; Thapa, P.; Lukashev, P.; Sabirianov, R. F.; Tsymbal, E. Y.; Sellmyer, D. J.; Nadgorny, B.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 83, No. 2, 024415, 31.01.2011.

Research output: Contribution to journalArticle

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AU - Sellmyer, D. J.

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