Modifications of magnetic properties of Pt/Co/Pt layers induced by Ga irradiations


Modifications of magnetic properties of Pt/Co/Pt layers induced by Ga irradiations

Gieniusz, R.; Mazalski, P.; Kurant, Z.; Maziewski, A.; Liedke, M. O.; Fassbender, J.; Wawro, A.; Baczewski, L. T.

The influence of Ga irradiation dose D on the magnetic properties of Pt/Co(d=3.3nm)/Pt trilayers grown by molecular beam epitaxy have been studied by both ferromagnetic resonance (FMR) and magnetooptical magnetometry (PMOKE). A broadening of Co-Pt interfaces induced by irradiation was deduced from X-ray reflectivity. For the nonirradiated sample the magnetisation was in-plane with negligible remanence ThetaR PMOKE hysteresis loops. Increasing D ThetaR(D) displays a maximum in irradiated samples for a dose DM ~ 2,8e14 ions/cm2. FMR study showed a similar behaviour (occurence of a maximum in a function of dose) both effective uniaxial magnetic anisotropy and FMR linewidth. For DM the increase of a uniaxial anisotropy field up to 0.3T was estimated from FMR data. Similar effects have been recently reported for Ga irradiated Co films deposited by sputtering which showed a double spin reorientation [J. Jaworowicz et al., Appl. Phys. Lett., 95 (2009) 022502].

Keywords: SRT; FMR; irradiation

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