Perpendicular magnetic anisotropy of Pd/Co2 MnSi/NiFe2O4/Pd multilayers on F-mica substrates

Abstract

Pd/Co2MnSi (CMS)/NiFe2O4 (NFO)/Pd multilayers were fabricated on F-mica substrate by magnetron sputtering. The best PMA performance of the multilayer structure Pd(3 nm)/CMS(5 nm)/NFO(0.8 nm)/Pd(3 nm) was obtained by adjusting the thickness of the CMS and NFO layers. F-mica substrate has a flatter surface than glass and Si/SiO2 substrate. The magnetic anisotropy energy density (K eff) of the sample deposited on F-mica substrates is 0.6711 Merg/cm3 (1 erg=10−7 J), which is about 30% higher than that of the multilayer films deposited on glass (0.475 Merg/cm3) and Si/SiO2 (0.511 Merg/cm3) substrates, and the R Hall and H C are also significantly increased. In this study, the NFO layer prepared by sputtering in the high purity Ar environment was exposed to the high purity O2 atmosphere for 5 min, which can effectively eliminate the oxygen loss and oxygen vacancy in NFO, ensuring enough Co–O orbital hybridization at the interface of CMS/NFO, and thus effectively improve the sample PMA.