XRD patterns of bulk samples obtained after annealing treatment at for 4 h and for 6 h, respectively. The inset is the enlarged diffraction line (111) and (200) for samples obtained at given temperatures.
(a) Temperature dependence of magnetization with ZFC and FC processes for , and (b) hysteresis loops of bulk samples measured at 300 K. The inset is an enlarged part near the central region of the loops.
(a) Temperature dependence of and of (, 0.03, 0.05, and 0.1) bulk samples, and (b) representative FC hysteresis loops measured at 10 K for (, 0.03, 0.05, and 0.1) samples. The inset is the exchange bias field as a function of the Fe content .
Training effect of (, 0.03, 0.05, and 0.1) bulk samples. Plotted are the first and the second hysteresis loops at 100 K after 6 kOe field cooling.
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