Oscillatory antiferromagnetic interlayer coupling inCo(4Å)∕Pt(tPt

Abstract

In this work, we have demonstrated the existence of oscillatory antiferromagnetic interlayer coupling in the Co/ Pt multilayer with perpendicular anisotropy by using the sample configuration of ͓Pt͑6 Å͒ / Co͑4 Å͔͒ / Pt͑t Pt Å͒ / ͓Co͑4 Å͒ / Pt͑6 Å͒ / Co͑4 Å͔͒ / NiO͑20 Å͒. As a function of t Pt , there exists a transition of the interlayer coupling from ferromagnetic to antiferromagnetic. At t Pt Ͻ 25 Å, the interlayer coupling between Co layers is always ferromagnetic, while at t Pt Ͼ 25 Å, the antiferromagnetic interlayer coupling appears and its strength varies as a function of t Pt in such a way as to lend support to a theoretical model for a ͑111͒ Pt spacer.

Magnetization reversal in [Ni/Pt]6/Pt(x)/[Co/Pt]6 multilayers

“…Oscillatory coupling through the Pt layers, as expected by the Ruderman-Kittel-Kasuya-Yosida model, has been verified for Pt/Co multilayers [39,40]. Differences between various systems may arise due to the superimposed magnetostatic interactions originating from roughness, which decay exponentially with increasing Pt spacer thickness [39]. Magnetron sputtered Co/Pt multilayers [40] show a local minimum at x¼1 nm followed by a weak local maximum and monotonous decrease at higher thicknesses.…”

“…5, must be attributed to the oscillatory nature of exchange coupling through the Pt layers. Oscillatory coupling through the Pt layers, as expected by the Ruderman-Kittel-Kasuya-Yosida model, has been verified for Pt/Co multilayers [39,40]. Differences between various systems may arise due to the superimposed magnetostatic interactions originating from roughness, which decay exponentially with increasing Pt spacer thickness [39].…”

Single shot ultrafast all optical magnetization switching of ferromagnetic Co/Pt multilayers

“…We thus attribute the net coupling to an RKKY-type of exchange as reported in Refs. [13][14][15][16] .…”

“…The GdFeCo and Co/Pt net moments present an AFM coupling for thick spacers, as was found in Refs. [13][14][15] . An RKKYtype of exchange [13][14][15][16] or a dipolar orange peel coupling 13,17 could explain such AFM coupling.…”

Single shot ultrafast all optical magnetization switching of ferromagnetic Co/Pt multilayers

“…13-15. An RKKY-type of exchange [13][14][15][16] or a dipolar orange peel coupling 13,17 could explain such AFM coupling. However, in Gd dominated samples, H b has an opposite sign (example shown in the supplementary material, Fig.…”