Thickness dependence of exchange bias and structure in MnPt and MnNi spin valves
نویسندگان
چکیده
We describe x-ray diffraction and magnetic measurements of annealed MnPt and NiMn spin valves as a function of MnPt ~NiMn! film thickness. Thin films (&5 – 10 nm) are not chemically ordered and hence not antiferromagnetic, which explains the lack of exchange coupling in these films. With increasing thickness, the L10 chemical order develops ~through coexistence between fcc and L10 phases! and there is a strong correlation between chemical order and exchange coupling. The lack of chemical order in the thin films is likely due to a lack of nucleation sites for the L10 phase. © 2002 American Institute of Physics. @DOI: 10.1063/1.1528279#
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