Magnetic properties of Co film in Pt/Co/Cr2O3/Pt structure

摘要

Magnetic properties of Co film in Pt/Co/α-Cr 2 O 3 /Pt/α-Al 2 O 3 structure were investigated. Co layer thickness t Co dependence of perpendicular magnetic anisotropy energy density K reveals that the bulk magnetic anisotropy plays an important role in the system in addition to the interfacial anisotropy. Damping constant α monotonically increases with the decrease of t Co but not proportionally to 1/ t Co . Both K and α increase with the increase of Pt layer thickness t Pt from 3 nm to 5 nm and keeps almost constant in the t Pt range between 5 nm to 20 nm. These results are of importance to understand the magnetization switching behavior driven by the magneto-electric (ME) effect as well as to design the spintronics device using the ME effect.