Abstract
We identified magnetoelectric effect in an ultrathin (Cr2O3/Fe2O3) nano-oxide layer structure (thickness ∼1 nm) formed on the surface of a Co0.9Fe0.1 metal layer by investigating the training effect as a function of sense current/bias voltage and its direction. A system-dependent constant κMR, which reflects changes in the surface spin, increases (decreases) with increasing current in the pinned (inverse pinned) direction. Furthermore, κMR varies for temperatures up to ∼200 K with current despite the extreme thinness, thus suggesting the current contributes to the surface spin changes. The results indicate the demonstration of the magnetoelectric effect in ultrathin Cr2O3.
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