Title :
Interfacial and Magnetic Properties of Pt/Co2FeAl0.5Si0.5/MgO Multilayers With Perpendicular Magnetic Anisotropy
Author :
Haijie Yu ; Yong Wu ; Lu Li ; Xiaoguang Xu ; Jun Miao ; Yong Jiang
Author_Institution :
Sch. of Mater. Sci. & Eng., Univ. of Sci. & Technol. Beijing, Beijing, China
Abstract :
We investigate the magnetic and interfacial behavior of perpendicularly magnetized full-Heusler alloy Co2FeAl0.5Si0.5 (CFAS) thin films with a stack structure of Pt/CFAS/MgO. The perpendicular magnetic anisotropy (PMA) is dominated by interfacial oxidation considering its strong dependence on the thickness of CFAS and MgO layers. Moreover, the annealing process will significantly promote the interfacial oxidation. The oxygen atoms will diffuse from the MgO layer to the CFAS layer during the annealing process, which is demonstrated by X-ray photoelectron spectroscopy. Therefore, the control of interfacial states of CFAS/MgO is important to tune the strength of PMA of Pt/CFAS/MgO.
Keywords :
X-ray photoelectron spectra; aluminium alloys; annealing; cobalt alloys; interface states; iron alloys; magnesium compounds; magnetic multilayers; magnetic thin films; metallic thin films; oxidation; perpendicular magnetic anisotropy; platinum; silicon alloys; surface diffusion; Pt-Co2FeAl0.5Si0.5-MgO; X-ray photoelectron spectroscopy; annealing process; diffusion; interfacial oxidation; interfacial properties; interfacial states; magnetic properties; multilayers; oxygen atoms; perpendicular magnetic anisotropy; perpendicularly magnetized full-Heusler alloy thin films; stack structure; Annealing; Electrodes; Films; Magnetic multilayers; Magnetic tunneling; Perpendicular magnetic anisotropy; Half-metal; interface; perpendicular magnetic anisotropy (PMA);
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2014.2321415
