Photon Factory Activity Report 2005 #23 Part B (2006)
Materials ScienceNE1A1/2005G116

Magnetic Compton profiles of Pt/Fe multilayers
Hiroshi Sakurai*1 Eiji Murayama1, Minoru Ota1, Katsuyoshi Takano1, Fumitake Itoh2, Hiroshi
Kawata3, Hiromichi Adachi3, Yoshiharu. Sakurai4, Msasayoshi Itou4 and Akihisa Koizumi51Dept. Electronic Enginerring, Gunma Univ., Kiryu, Gunma, 376-8515, Japan
2
Research Institute of Electromagnetic Devices, Hishi-machi, Kiryu, Gunma, 376-0001, Japan
3
KEK-PF, Tsukuba, Ibaraki, 305-0801, Japan
4
JASRI/Spring-8, Sayo-cho, Hyogo, 679-5198, Japan
5Dept. Material Science, Univ. of Hyogo, Kamigori-cho, 678-1297, Japan
Pt/Fe multilayers have been reported to show aperpendicular anisotropy [1] and soft magnetic properties [2]with the thin Fe layer thickness. Furthermore it has beenreported that Pt/Fe multilayers have an fcc Fe phase with thin
Fe layer thickness [2]. The Pt polarization and enhanced Fe
magnetic moment are expected from the theoretical
calculation in Pt-Fe alloy system [3]. These characteristic Fe
are of importance not only for a fundamental science but also
industrial applications such as a data storage media and highfrequency magnetic devices. However the electronic structuresof the Pt/Fe have not been clear.
In this paper we report on MCPs of the Pt/Fe multilayerand separate the contribution into Fe layer and Pt layer anddiscuss on the anisotropy of the wavefunctions and electronicstructures.
Three kinds of multilayers, [Pt(2.0nm)/Fe(0.5nm)],[Pt(2.0nm)/Fe(0.9nm)] and [Pd(2.0nm)/Fe(2.3nm)], were
fabricated by the R.F. sputtering method. Crystal structure andmultilayered structure were confirmed by θ-2θ X-ray
diffraction measurements with the Cu-Kα1 radiation. Textureof (111) of fcc Pt and/or fcc Fe was observed in the eachmultilayers. Satellite peaks were observed near the fcc (111)diffraction peak. These satellite peaks were consistent withdesigned multilayer periods.
MCP’s were measured at the AR-NE1A1 beamline ofKEK-PF. Figures 1 show the MCPs of the Pt/Fe multilayerswith in-plane configuration and out-of-plane configuration. Felayer thickness dependence has been observed with both thein-plane configuration and out-of-plane configuration. The
anisotropies of MCPs, ∆Jmag(pz), depend on the Fe layer
thickness. Figures 2 show the MCPs, which are separated into
the contribution from the fcc Pt layer and the fcc Fe layer.
Both the MCPs of the fcc Pt and the fcc Fe show theanisotropy. However, anisotropies of the MCPs, ∆Jmag(pz), areprominent in the fcc Fe. This suggests that the anisotropies ofthe present Pt/Fe multilayers mainly come from the fcc Felayer. Theoretical MCPs of the fcc Fe by the band calculation(BANDS01) are also shown in Fig. 2. The theoretical
calculation cannot reproduce the present MCPs of the fcc Fe.
Then the electronic structures of the fcc Fe are modified due tothe interface effects such as Pt5d-Fe3d hybridization at theFe/Pt interface and/or strain effects due to the difference oflattice constants between the fcc Pt and fcc Fe.

In conclusion, the perpendicular anisotropy of the Pt/Fe
multilayer is dominated by the Fe 3d electrons with fccstructure.

Fig.1 Magnetic Compton profiles of Pt/Fe multilayes.

Fig. 2 Magnetic Compton Profiles of fcc Pt and fcc Fe in thePt/Fe multilayers.
References[1] T. Katayama, Y. Suzuki, Y. Nishihara, T. Sugimoto andM. Hashimoto, J. Appl. Phys. 69(1991)5658[2] F. Pan, M. Zhang and B. X. Liu, Thin Solid Films, 334(1998)196[3] M. Podgorny, Phys. Rev. B43(1991)11300*sakuraih@el.gunma-u.ac.jp

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