title: Nanopillar spin filter tunnel junctions with manganite barriers.
abstract: The potential of a manganite ferromagnetic insulator in the field of spin-filtering has been demonstrated. For this, an ultrathin film of Sm0.75Sr0.25MnO3 is integrated as a barrier in an epitaxial oxide nanopillar tunnel junction and a high spin polarization of up to 75% at 5 K has been achieved. A large zero-bias anomaly observed in the dynamic conductance at low temperatures is explained in terms of the Kondo scattering model. In addition, a decrease in spin polarization at low bias and hysteretic magneto-resistance at low temperatures are reported. The results open up new possibilities for spin-electronics and suggest exploration of other manganites-based materials for the room temperature spin-filter applications.
authors.affiliation: Department of Materials Science and Metallurgy, University of Cambridge , 27 Charles Babbage Road, Cambridge, CB3 0FS, U.K.
authors.forename: Bhagwati
authors.initials: B
authors.lastname: Prasad
authors.forename: Mehmet
authors.initials: M
authors.lastname: Egilmez
authors.forename: Frank
authors.initials: F
authors.lastname: Schoofs
authors.forename: Thomas
authors.initials: T
authors.lastname: Fix
authors.forename: Mary E
authors.initials: ME
authors.lastname: Vickers
authors.forename: Wenrui
authors.initials: W
authors.lastname: Zhang
authors.forename: Jie
authors.initials: J
authors.lastname: Jian
authors.forename: Haiyan
authors.initials: H
authors.lastname: Wang
authors.forename: Mark G
authors.initials: MG
authors.lastname: Blamire