57Fe Mössbauer spectroscopy from Tb/Fe and Er/Fe multilayers

Magnetization depth profile of (Fe/Dy) multilayers

“…The perpendicular magnetic anisotropy (PMA) in (TM/RE) multilayers has been studied very intensively for several decades [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], but its origin is still controversial. Since Tb has the largest local anisotropy constant, most of the studies have been devoted to (Fe/Tb) multilayers.…”

Spin-wave excitation and Mössbauer spectrometry of amorphous interface in Tb/Fe multilayer

“…Perpendicular magnetic anisotropy for a Tb(48 Å)/Fe(26 Å) multilayer is reinforced by the presence of an amorphous alloy formed at the interface between Fe and Tb layers [2]. We have studied the magnetization of the interface of Tb(48 Å)/Fe(26 Å) annealed multilayer in terms of the spin-wave theory which allowed us to determine the Fe-Fe distance, the nature of the interactions in the magnetic interface of sublattice and the exchange parameter A.…”

“…The morphology and the extension of the interfaces in relation with the substrate temperature and the deposition process are investigated by 57 Fe Mössbauer spectrometry method [9]. The study showed that perpendicular magnetic anisotropy is enhanced when the interface consists of an amorphous Fe-Tb alloy [2,10] or where the multilayers have annealed at certain temperature and duration of annealing [3,[10][11]. In this work we describe the results of our studies of Tb(48 Å)/Fe ( of 10 −7 Torr at 673 K during 6 h, we have studied their interface by exploiting the evolution of the hyperfine field distribution in function of the temperature of measurement and discuss them in the context of conclusions published in the literature [1][2][3]7,10].…”

“…The magnetic parameters in RE/Fe multilayers are iron ferromagnetism, strong anisotropy and RKKY (Ruderman-Kittel-Kasuya-Yosida) type interactions in the rare earth, ferromagnetic (ferrimagnetic) coupling between iron and light (heavy) rare earth. In Tb/Fe multilayer, the occurrence of perpendicular magnetic anisotropy in these multilayered systems depends mainly on the extensions and the nature of the interfacial Fe-Tb region [1][2][3][7][8]. The morphology and the extension of the interfaces in relation with the substrate temperature and the deposition process are investigated by 57 Fe Mössbauer spectrometry method [9].…”

“…Perpendicular magnetic anisotropy has been observed for same of them which makes them potential candidates for perpendicular magnetic recording devices [1][2][3][4][5][6]. The magnetic parameters in RE/Fe multilayers are iron ferromagnetism, strong anisotropy and RKKY (Ruderman-Kittel-Kasuya-Yosida) type interactions in the rare earth, ferromagnetic (ferrimagnetic) coupling between iron and light (heavy) rare earth.…”