Direct evidence of spin filtering across MnFe$_2$O$_4$ tunnel barrier by Meservey-Tedrow experiment

S. Matzen; J.-B. Moussy; G. X. Miao; J. S. Moodera

doi:10.1103/PhysRevB.87.184422

Direct evidence of spin filtering across MnFe$_2$O$_4$ tunnel barrier by Meservey-Tedrow experiment

S. Matzen ¹ J.-B. Moussy ¹ G. X. Miao ² J. S. Moodera ^{3, 2}

1 LCSI - Laboratoire de Chimie des Surfaces et Interfaces

2 Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology

3 Department of Physics [MIT Cambridge]

Abstract : A spin filtering effect has been evidenced in epitaxial MnFe$_2$O$_4$ tunnel barriers directly by Meservey-Tedrow experiments. The asymmetry of the Zeeman-split tunneling conductance curves of the superconducting Al spin analyzer in Pt(111)/MnFe$_2$O$_4$(111)/$\gamma$-Al$_2$O$_3$(111)/Al tunnel junctions revealed a positive spin-polarization (up to + 9%), proving the potential of manganese ferrite for generation of a spin-polarized current. A negatively polarized spin filtering being expected theoretically, different mechanisms are discussed to explain both sign and amplitude of the measured spin-polarization.

Type de document :

Article dans une revue

Physical Review B : Condensed matter and materials physics, American Physical Society, 2013, 87, pp.184422. 〈10.1103/PhysRevB.87.184422〉

Domaine :

Physique [physics]

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