K. Suzuki, J. Hoshino, M. Itoh, T. Hiratsuka, A. Sawada
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Giant Inverse Tunneling Magnetoresistance in Single CrO_2 / Vacuum / Ni_80Fe_20 Using Conductive AFM
The chromium dioxide (CrO2) is a half metallic ferromagnet which has both the metallic and semiconductive spin bands.The tunneling magnetoresistance (TMR) has been measured in single CrO2 deposited on (110) TiO2/vacuum/ Ni80Fe20 film on the AFM cantilever at room temperature. The behavior showed the giant inverse type of the TMR and the values of the TMR ratio from -74% to -63% were estimated using the experimental results, which means the spin polarization of-100% in CrO2. It was estimated that the surface of CrO2 has the insulator layer with the thickness of about 8~10[nm].
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