Opto-spintronics in InP using ferromagnetic tunnel spin filters
نویسندگان
چکیده
Wedemonstrate opto-spintronics using Fe-doped IndiumPhosphide (InP). Themethod is based on optical orientation of InP conduction electron spinswhich are electrically detected in planar InP/ oxide/Ni tunnel spinfilters.We separate the optical excitation from electrical detection, avoiding thus additional interactions of photonswith the ferromagnet. Interface engineering provides a surface iron accumulation and semiconducting Fe:In2O3 in the oxide tunnel barrier. The spinfiltering effect switches to positive or negative asymmetry, depending on the Fe concentration in Fex:InP.With respect to the Fe-like electronic structure of these oxides, we can explain the opposite spin selection mechanisms as interface effects. In the temperature regionwhere the InPmobility peaks, wefind a maximumof spin-dependent asymmetry of∼9% in semi-insulating Fe:InP (001), and show the electrical spin detection in hyperpolarized InP also at room temperature. Such robust electronic spin detection in an InPnanodevice is planned to complement dynamic nuclear polarization experiments.
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