Analysis of anisotropy crossover due to oxygen in Pt/Co/MOx trilayer
Aur\'elien Manchon (SPINTEC), Clarisse Ducruet (SPINTEC, LLN, CRETA),, Lucien Lombard (SPINTEC), St\'ephane Auffret (SPINTEC), Bernard Rodmacq, (SPINTEC), Bernard Dieny (SPINTEC), Stefania Pizzini (NEEL), Jan Vogel, (NEEL), Vojtech Uhlir (NEEL), Michael Hochstrasser
TL;DR
This study investigates how oxygen-induced oxidation affects magnetic anisotropy in Pt/Co/MOx trilayers, revealing a transition from in-plane to out-of-plane anisotropy linked to Co-O bonding at the interface.
Contribution
It provides new insights into the role of oxidation in tuning magnetic anisotropy at the Co/MOx interface using spectroscopic analysis.
Findings
Oxidation time modifies magnetic anisotropy.
Maximum out-of-plane anisotropy correlates with Co-O bonds.
Plasma oxidation influences magnetic properties.
Abstract
Extraordinary Hall effect and X-ray spectroscopy measurements have been performed on a series of Pt/Co/MOx trilayers (M=Al, Mg, Ta...) in order to investigate the role of oxidation in the onset of perpendicular magnetic anisotropy at the Co/MOx interface. It is observed that varying the oxidation time modifies the magnetic properties of the Co layer, inducing a magnetic anisotropy crossover from in-plane to out-of-plane. We focused on the influence of plasma oxidation on Pt/Co/AlOx perpendicular magnetic anisotropy. The interfacial electronic structure is analyzed via X-ray photoelectron spectroscopy measurements. It is shown that the maximum of out-of-plane magnetic anisotropy corresponds to the appearance of a significant density of Co-O bondings at the Co/AlOx interface.
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