Layers structuring is one of the effective methods of regulating the exchange interaction of heterogeneous magnetic layers, which, in turn, sets the specifics of the magnetization reversal of multilayered films, including the presence and the magnitude of the so-called exchange bias [1, 2]. This work is devoted to studying the features of the formation of interlayer interaction in the (Fe-Ni)/Ti/(R-Co) (R = Gd, Dy) film structures, where Fe-Ni is a polycrystalline ferromagnetic layer, R-Co is a structurally amorphous ferrimagnetic layer, and Ti is a paramagnetic spacer of variable thickness. The film samples were obtained on glass substrates by high-frequency ion-plasma sputtering of homogeneous (Fe-Ni, Ti) and mosaic (Gd-Co or Dy-Co) targets at the presence of an external magnetic field of 170 Oe. The nominal thicknesses of the Fe-Ni and R-Co layers were 50 and 110 nm, respectively. The thickness of the Ti spacer varied within L = 0–1.3 nm. The iron content in the ferromagnetic layers corresponded to 10 at.%. The concentration of rare-earth metal in the ferrimagnetic layers was 26–30 at.%. To analyze the magnetic properties, we used the measurements of hysteresis loops performed on a LakeShore 7407 VSM vibrating magnetometer. Figures 1 and 2 show the hysteresis loops m(H) demonstrating the features of the magnetization reversal of individual layers in the considered film structures. It was found that at L < 0.8 nm, the joint magnetization reversal of the interacting layers, which is the result of a strong interlayer exchange coupling, takes place (Fig. 1(a), 2(a)). With an increase in L, the interlayer interaction weakens and the described peculiarity of the magnetization reversal process disappears (Fig. 1(b), 2(b)), however, for samples with Dy-Co, an exchange bias of the hysteresis loops of the Fe-Ni ferromagnetic layer begins to be observed. The work has been financially supported by the RSF grant, project no. 18-72-10044.References: 1. W. H. Meiklejohn and C. P. Bean, Phys. Rev. 102, 1413–1414 (1956). 2. F. Radu and H. Zabel, Springer Tracts in Modern Physics 227 (Springer, Berlin Heidelberg, 2008), pp. 97–184.

Features of Magnetization Reversal of Fe10Ni90/Ti/(R-Co) (R = Gd, Dy) Films

M6: Structured Materials

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Features of Magnetization Reversal of Fe10Ni90/Ti/(R-Co) (R = Gd, Dy) Films

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