Abstract
Magnetic properties of Co film in Pt/Co/α-Cr2O3/Pt/α-Al2O3 structure were investigated. Co layer thickness tCo 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 tCo but not proportionally to 1/tCo. Both K and α increase with the increase of Pt layer thickness tPt from 3 nm to 5 nm and keeps almost constant in the tPt 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.
Highlights
Modulation of magnetic properties by means of electric-field is attracting much attention for application to low power electronics
It was shown that the ME-driven magnetic domain wall (DW) mobility in the Pt/Co/Au/α-Cr2O3 system was quite similar to the magnetic-field DW mobility of the Pt/Co/Pt system despite that the very small damping constant was predicted for the α-Cr2O3, which suggests that the switching dynamics in the Pt/Co/α-Cr2O3 system was governed by the magnetization dynamics of the Pt/Co
Co layer thickness dependence reveals that the perpendicular magnetic anisotropy of the Co layer in the stack has its origin in the bulk anisotropy in addition to the interfacial anisotropy
Summary
Modulation of magnetic properties by means of electric-field is attracting much attention for application to low power electronics. A detailed investigation is important to realize the application of Cr2O3-based ME switching As it is well known, both of the interfacial anisotropy and the bulk anisotropy are present in the Pt/Co system. It was shown that the ME-driven magnetic domain wall (DW) mobility in the Pt/Co/Au/α-Cr2O3 system was quite similar to the magnetic-field DW mobility of the Pt/Co/Pt system despite that the very small damping constant was predicted for the α-Cr2O3, which suggests that the switching dynamics in the Pt/Co/α-Cr2O3 system was governed by the magnetization dynamics of the Pt/Co. In the present study, to deepen understating those important magnetic properties for the switching using the ME effect with α-Cr2O3, we investigated the magnetic properties of the Co layer in the Pt/Co/α-Cr2O3 system
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