Perpendicular magnetic anisotropy properties of Co2FeSi/Pt multilayers deposited on amorphous dielectric Ta2O5

Abstract

Perpendicular magnetic anisotropy (PMA) is the mostsignificant characteristic for the development ofnonvolatile magnetic storage systems with superior performance. Hence, we investigate PMA of Co2FeSi (CFS)/Pt structures deposited on amorphous Ta2O5 of high dielectric constant. This design has the potential to be beneficial for low-power voltage-controlled spintronic devices. Strong PMA around ∼ 106 erg/cm3 is noticed in Ta2O5/[CFS/Pt]3 stacks with CFS thickness ranging from 0.6 ∼ 1.0 nm. The interfacial PMA energy density is found to be ∼ 0.63 erg/cm2. The PMA rises in the beginning with increase in number of repetitions (n), reaches a maximum of1.4x106 erg/cm3 at n = 3, and then falls. Pronounced thickness effects of Ta2O5 buffer on magnetic properties are observed. We clearly demonstrate the process of engineering PMA in the CFS/Pt bilayer structures deposited on Ta2O5 dielectric. Our findings might be useful for designing CFS/Pt multilayers on high-K dielectric for low power consumption spintronic devices.