https://doi.org/10.1140/epjp/s13360-022-02667-x
Regular Article
Pt capping effects on the perpendicular magnetic properties of Pt/Co2MnSi/MgAl2O4 trilayers
1
School of Mechanical and Electronic Engineering, East China University of Technology, 330013, Nanchang, China
2
School of Physics, Communication and Electronics, Jiangxi Normal University, 330022, Nanchang, China
3
School of Physics and Technology, Wuhan University, 430072, Wuhan, China
Received:
7
December
2021
Accepted:
31
March
2022
Published online:
8
April
2022
A series of Pt/Co2MnSi(CMS)/MgAl2O4(MAO) trilayers are fabricated by sputtering. Perpendicular magnetic anisotropy (PMA) is observed to build in the Pt/CMS/MAO trilayers annealed at 200 °C with a relatively narrow range of CMS thickness from 2 to 2.5 nm. An interfacial anisotropy energy density of 0.40 ± 0.04 erg/cm2 is obtained in the trilayers. Significantly enhanced PMA is demonstrated in the trilayers capped with Pt. PMA is shown to be demonstrated in a wide window of annealing temperature ranged from 200 to 400 °C with CMS thickness increases from 2 to 3.5 nm. The maximum effective perpendicular anisotropy is determined to be in the order of 106 erg/cm3. A large interfacial perpendicular anisotropy energy density of 1.95 ± 0.15 erg/cm2 is achieved for Pt-caped trilayers annealed at 300 °C. Strong Pt (111) peak is observed in the presence of the Pt capping, which may be responsible for the significantly enhanced PMA. For the Pt-capped trilayers pronounced effect of MAO thickness on PMA is observed. MAO is found to be requisite in developing PMA. For the structure with thick MAO high temperature annealing is required to promote PMA. Our findings are useful for fabricating perpendicular spintronic devices that require high PMA and high annealing stability.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2022
