Spinterface Induced Modification in Magnetic Properties in Co40Fe40B20/Fullerene Bilayers

TL;DR

This paper demonstrates that adding a fullerene (C60) layer to CoFeB/ferromagnetic bilayers enhances magnetic anisotropy through spinterface formation, without altering the magnetic domain structure, revealing new ways to tune magnetic properties.

Contribution

It introduces a method to increase magnetic anisotropy in CoFeB by incorporating C60 layers, highlighting the role of spinterface effects in magnetic property modification.

Findings

Magnetic anisotropy increases with C60 thickness.

Spinterface formation influences magnetic anisotropy.

Magnetic domain structure remains unchanged.

Abstract

Organic semiconductor/ferromagnetic bilayer thin films can exhibit novel properties due to the formation of the spinterface at the interface. Buckminsterfullerene (C60) has been shown to exhibit ferromagnetism at the interface when it is placed next to a ferromagnet (FM) such as Fe or Co. Formation of spinterface occurs due to the orbital hybridization and spin polarized charge transfer at the interface. In this work, we have demonstrated that one can enhance the magnetic anisotropy of the low Gilbert damping alloy CoFeB by introducing a C60 layer. We have shown that anisotropy increases by increasing the thickness of C60 which might be a result of the formation of spinterface. However, the magnetic domain structure remains same in the bilayer samples as compared to the reference CoFeB film.