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Paper detail

Spin Valve Effect in Self-exchange Biased Ferromagnetic Metal/Semiconductor Bilayers

We report magnetization and magetoresistance measurements in hybrid ferromagnetic metal/semiconductor heterostructures comprised of MnAs/(Ga,Mn)As bilayers. Our measurements show that the (metallic) MnAs and (semiconducting) (Ga,Mn)As layers are exchange coupled, re- sulting in an exchange biasing of the magnetically softer (Ga,Mn)As layer that weakens with layer thickness. Magnetoresistance measurements in the current-perpendicular-to-the-plane geometry show a spin valve effect in these self-exchange biased bilayers. Similar measurements in MnAs/p- GaAs/(Ga,Mn)As trilayers show that the exchange coupling diminishes with spatial separation between the layers.

preprint2007arXivOpen access
M. ZhuM. J. WilsonB. L. SheuP. MitraP. SchifferN. Samarth
cond-mat.mtrl-sci
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M. ZhuM. J. WilsonB. L. SheuP. MitraP. SchifferN. Samarth

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