Magnetization-induced second harmonic generation from the Ni/Cu interface in multilayers on Cu(001)

Abstract

Ultrathin Ni films in Cu/Ni/Cu͑001͒ bilayers and exchange coupled Ni films in Ni/Cu/Ni/Cu͑001͒ trilayers are investigated by magnetization induced second harmonic generation ͑MSHG͒. The results are analyzed in a model of localized nonlinear polarizabilities at the interfaces. We show that antiferromagnetic coupling in the Ni/Cu/Ni trilayers is observable with MSHG due to the presence of quantum well states ͑QWS's͒ in the Cu layer. The influence of the QWS's on the SHG from a Ni film in a Cu/Ni/Cu͑001͒ bilayer is weaker compared to the case of Fe or Co bilayers.

Magnetization-induced second-harmonic generation of light by exchange-coupled magnetic layers

“…This result is expected because the film is deposited on glass, which is an insulating material with low thermal conductivity. So, as claimed, inside the laser spot area the local temperature is raised to ϳ80°C, i.e., close to the compensation temperature of Dy 30 Fe 58 Co 12 .…”

“…1), is essentially sensitive to the in-plane magnetic component of the Fe 96 Si 4 layer. However, small and nearly reversible effects of a progressive rotation of Dy 30 Fe 58 Co 12 and Fe 96 Si 4 magnetization toward the in-plane field direction can be superimposed. LMOKE hysteresis loops, measured at 45°of incidence, for Fe 96 Si 4 (5-or 10-nm) films are shown in Figs.…”

“…5,6 Whereas it has been demonstrated experimentally that MSHG undoubtedly comes from surface magnetism, [7][8][9][10] there have been few studies of real multilayer structures involving several types of buried interface. [11][12][13][14][15] Our aim in the present study is to check theoretical predictions about MSHG in a simple exchange-coupled layer structure built from two magnetic layers in contact that have perpendicular and in-plane anisotropy, respectively. MSHG is then assumed to check partially the magnetization state at their interface, on which is centered a planar domain wall.…”

Interfacial magnetization in exchange-coupledFe∕Cr∕Festructures investigated by second harmonic generation

“…The field dependences of MSHG in sandwiched Cu/ Ni/ Cu͑100͒ and exchange-coupled Ni/ Cu/ Ni/ Cu͑001͒ structures composed of ultrathin ͑Ϸ6 ML͒ magnetic layers were investigated in Ref. 42. In this work the antiferromagnetic interlayer exchange coupling in the Ni/ Cu/ Ni trilayer was observed by means of MSHG due to the presence of localized quantum well states ͑QWSs͒ in the Cu spacer.…”

Temperature dependence of magnetization-induced second harmonic generation at buried exchange-biased interfaces

“…18,19 In the limit of ultrathin films we can combine those susceptibilities ͑the interfaces are numbered as in the inset in Fig. 1͒ …”