Induced Magnetic Anisotropy in Co/WS 2 Bilayer

Abstract

Magnetic anisotropy plays an important role in ultrathin structures and two-dimensional materials and influences their magnetoresistance (MR) response. Here, the effects of the two-dimensional WS2 layer on the structural and magnetic properties of cobalt (Co) thin film are investigated in a Co/WS2 bilayer fabricated on Si (100) substrates. The Co layer grown on the WS2 layer formed a crystal structure whereas that individual Co isolated layer is amorphous. Both prepared samples show an out-of-plane easy axis while their in-plane anisotropy is different. The magnetic hysteresis loop and MR measurements show that there is an in-plane easy axis in the Co/WS2 bilayer due to the crystallinity formation of Co grown on WS2 which is not observed in Co isolated layer. Our results represent an interface control of anisotropy in two dimensional structures.