Domain state modulation by interfacial diffusion in FePt/FeCo thin films: experimental approach with micromagnetic modelling.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
Garima VashishtS Annapoorni

Abstract

We report the complex implications of inter-diffusion between polycrystalline FePt/FeCo layers as an impact of the FeCo underlayer on the structural and magnetic properties of the system. The crystalline growth of FePt strongly reduces in an entirely diffused system compared to the one with lesser diffusion, while the crystalline structure of FeCo is apparently less affected. Charge redistribution occurs between Fe, Co and Pt ensuring increased Co-Pt and Fe-Pt interactions with higher diffusion. Thereafter, we combine hysteresis and magnetic force microscopy measurements to show that the interfacial deformations result in the distinct out-plane magnetic behaviour of the system. FeCo@FePt nano-composite like structure, originating due to interfacial diffusion, shows interactions between two magnetic phases with in-plane low anisotropy exhibiting wasp-shaped out-plane hysteresis loop. Whereas the layered structure of FePt/FeCo films shows random anisotropy with a significant out-plane contribution even in the polycrystalline films. Micromagnetic modelling demonstrates coercivity deterioration and reduction of switching field due to the formation of a slightly diffused interface. Contrarily, the experimental observations for compl...Continue Reading

References

Feb 15, 2001·Physical Review Letters·S P LiK Ounadjela
Jan 31, 2018·Nature Nanotechnology·Davide MaccarielloAlbert Fert
Feb 12, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Tobias PrellerGeorg Garnweitner

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Citations

Oct 29, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·R K DokalaS Thota

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