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(a) Schematic diagram of the spin configuration of a single-phase magnet with two magnetic sublattices. The spin reversal of the FM sublattice feels the pinning from the AFM sublattice. (b) Crystal structure of LuFe2O4 and YbFe2O4.
Temperature dependence of magnetization of YbFe2O4 measured in the FC mode with H = 1 kOe. The magnetic transition at T1 = 245 K corresponds to the ferrimagnetic ordering of Fe2+/Fe3+ sublattice and the transition at T2 ≈ 50 K is due to the coupling between Yb3+ and Fe2+/Fe3+ sublattices. The inset shows the M-T curves in the FC mode with H = 5 and 13 T.
The M-H hysteresis loops of YbFe2O4 at 5 K with both the ZFC and FC modes. For comparison, the inset shows the FC hysteresis loop of LuFe2O4 measured at 5 K with a cooling field of 13 T.
Cooling magnetic field dependence of H EB of YbFe2O4 at 5 K. Inset: enlarged view of the M-H loops with different H cool = 0, 5, 10, and 50 kOe.
Temperature dependence of H EB measured with a cooling field of 13 T. The insets show the M-H loops and the cooling field dependence of EB at 25 K.
Training effect of EB at 5 K. The main panel shows the consecutive hysteresis loops measured after FC in 13 T. For clarity, only the loops with cycling number n = 1, 2, 3, and 10 are plotted. The inset shows H EB vs n. The solid line is the fitting curve with Eq. (2) .
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