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Coercive mechanism and training effect in Fe-Au/Ni-Fe bilayer films
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View: Figures


Image of FIG. 1.
FIG. 1.

(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.

Image of FIG. 2.
FIG. 2.

(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.

Image of FIG. 3.
FIG. 3.

(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.

Image of FIG. 4.
FIG. 4.

(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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Coercive mechanism and training effect in Fe-Au/Ni-Fe bilayer films