Magnetic properties of postoxidized Pt∕Co∕Al layers with perpendicular anisotropy
Résumé
The magnetic properties of ultrathin Co layers sandwiched between Pt and Al layers are studied asa function of the Al layer oxidation time. The association of three batches of complementaryexperiments(extraordinary Hall effect, x-ray photoelectron spectroscopy, and tunnelingmagnetoresistance ) allows the authors to finely characterize their samples both magnetically andchemically. The authors show that their oxidation process reduces the coercive field of ultrathin Colayers with perpendicular anisotropy (case of short oxidation time ) and can even induce transitionfrom a ferromagnetic to a superparamagnetic state ( lengthy oxidation time )
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