Organic Spin Valves with Characteristics of Inelastic Tunneling and Hopping Transport

ORAL

Abstract

We report on the inelastic scattering characteristics of an organic-based spin valve with a thin organic barrier of 3,4,9,10-perylene-teracarboxylic dianhydride (PTCDA) dusted with alumina at organic/ferromagnetic interfaces. Spin injection with magnetoresistance up to 12\% at room temperature was achieved. In the inelastic tunneling spectrum, the observation of characteristic vibrational loss peak of organic spacer provides direct evidence of the interplay between the spin-polarized electrons and the organic molecules. The spin-dependent transport mechanism can be further described with a model of combined tunneling and hopping processes as verified by experiments as a function of organic layer thickness.

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Authors

  • Minn-Tsong Lin

    • Dept. of Physics, National Taiwan University
    • Taiwan University

  • Kai-Shin Li

    • Dept. of Physics, National Taiwan University

  • Yin-Ming Chang

    • Dept. of Physics, National Taiwan University

  • Santhanam Agilan

    • Dept. of Physics, National Taiwan University

  • Jhen-Yong Hong

    • Dept. of Physics, National Taiwan University

  • Jung-Chi Tai

    • Dept. of Physics, National Taiwan University

  • Wen-Chung Chiang

    • Dept. of Physics, Chinese Culture University

  • Keisuke Fukutani

    • Dept. of Physics and Astronomy, University of Nebraska

  • P.A. Dowben

    • Dept. of Physics and Astronomy, University of Nebraska