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(Color online) Dependence of coercivity on temperature for the Fe-Au/Ni-Fe samples with different Fe-Au layer thickness of 5, 10, 20, 30, 50, 100 nm. Solid lines are the fitting curve of second-order exponential decay.
(Color online) Hysteresis loops for Fe-Au powder sample measured at temperatures from (a) 5 to 30 K with maximum applied field of 5 T, (b) 4.2 to 30 K with maximum applied field of 5 kOe. Dependence on temperature of (c) coercivity H c and (d) difference in H c between Fe-Au powder and Fe-Au/Ni-Fe thin films ΔH c with t sg = 100 nm. The experimental data in (d) was fitted to second-order exponential decay function as shown by the solid line.
(Color online) Training effect for the Fe-Au/Ni-Fe samples with t sg = 30 nm field cooled at 5 kOe from RT to 4.2 K measured at temperatures of (a) 6 K, (b) 8 K, and (d) 13 K. (c) Training effect at 8 K obtained immediately after the measurement at 6 K without redoing field cooling. Measurements of different cycles are denoted by different symbols.
(Color online) Training effect for Fe-Au powder at (a) 4 K and (b) 11 K. (c) Reduced H c as a function of hysteresis cycle.
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