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(Color online) (a) Temperature-dependent magnetization for bilayer samples with three different (Ga,Mn)As thicknesses. Measurements are carried out while warming, after first cooling the samples down to in a field of . The magnetization is shown per unit area. (b) Major magnetization loop at for a bilayer sample with showing two distinct coercive fields for the two FM layers. (c) Minor magnetization loop for the same sample at , measured after saturating the MnAs layer in a field . (d) Dependence of (circles) and (squares) on at .
(Color online) Normalized CPP magnetoresistance (as a percentage) in a bilayer sample in (a) major and (b) minor hysteresis loops at different temperatures. The data are offset vertically for clarity.
(Color online) (a) Major and (b) minor hysteresis loops for a trilayer sample at showing that exchange biasing persists even with a spacer layer. Panels (c) and (d) show the CPP magnetoresistance in major and minor loops, respectively, showing the spin valve effect in the trilayer.
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