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(a) The depth profile of a CoFe/(Co,Fe)O/SiO2 bilayer. The cross-sectional TEM image of a CoFe/(Co,Fe)O (VEH = 130 V)/MgO(100) bilayer prepared by FIB is shown in the inset. The XPS spectra of Co 2p at different sputter times (tsp.) of (b) 0.4 min and (c) 1.6 min. The XPS spectrum of O 1s at tsp. = 1.6 min is shown in (d).
The hysteresis loops of CoFe/(Co,Fe)O/MgO bilayers measured at 50 K after FC in 12 kOe in the film plane from 350 K.
The temperature dependence of (a) ZFC and FC magnetization and (b) the difference between ZFC and FC magnetization of CoFe/(Co,Fe)O bilayers.
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