Physics – Condensed Matter – Materials Science
Scientific paper
2007-08-15
Appl. Phys. Lett. 91, art. no. 192503 (2007)
Physics
Condensed Matter
Materials Science
Scientific paper
10.1063/1.2806966
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.
Mitra Partha P.
Samarth Nitin
Schiffer Peter
Sheu B. L.
Wilson Michael J.
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