High spin-filter efficiency in a Co ferrite fabricated by a thermal oxidation

Y. K. Takahashi, S. Kasai, T. Furubayashi, S. Mitani, K. Inomata, K. Hono

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63 Citations (Scopus)

Abstract

Co ferrites fabricated by a thermal oxidation have been tested as a spin filter. Spin-filter efficiencies of 44% and 4.3% were confirmed at 10 K and RT, respectively, using a magnetic tunnel junction of Pt/ CoFe2 O 4 /MgO/Co. By increasing the bias voltage, the tunneling magnetoresistance (TMR) at 10 K increases then decreases. This is interpreted as a tunneling via spin-down conduction band in the Co ferrite. Since the electron at RT is attributed to a hopping conduction on the defect states in the Co ferrite, the reduction of the defects will be the key to achieving a higher spin-filter effect.

Original languageEnglish
Article number072512
JournalApplied Physics Letters
Volume96
Issue number7
DOIs
Publication statusPublished - 2010
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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