MnFe structure-exchange anisotropy relation in the NiFe/MnFe/NiFe system

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Abstract
The relation between the MnFe structure and the exchange anisotropy in the Ni80Fe20/Mn50Fe50/Ni80Fe20 system has been investigated. The samples have a layered structure of glass/NiFe(600 Å)/MnFe(40–400 Å)/NiFe(300 Å)/Ta(200 Å). For the lower interface, NiFe(600 Å)/MnFe, the anisotropy energy falls in the range of 0.00–0.06 erg/cm2 and the critical temperature in the range of 120–160 °C; both increase initially with the MnFe thickness but become essentially constant for MnFe thicknesses beyond 80 and 160 Å, respectively. For the upper interface, MnFe/NiFe(300 Å), the anisotropy energy falls in the range of 0.00–0.16 erg/cm2 and the critical temperature in the range of 110–190 °C; again, both increase initially with the MnFe thickness but decrease for MnFe thickness beyond 120 and 360 Å, respectively. The correlations between the exchange anisotropy and the MnFe structure determined by x‐ray diffraction are identified.