Journal of Magnetism and Magnetic Materials
Volumes 290-291, Part 1
,
April 2005,
Pages 78-81
Proceedings of the Joint European Magnetic Symposia (JEMS' 04)
doi:10.1016/j.jmmm.2004.11.216 
Copyright © 2004 Elsevier B.V. All rights reserved.
Structural and magnetic properties of Fe/Si and Fe/FeSi multilayers
I. Sakamotoa, 
, 
, S. Hondab, H. Tanouea, M. Koikea and S. Purwantoa
aNational Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
bShimane University, 1060 Nishikawatsu, Matsue, Shimane 690-8504, Japan
Available online 8 December 2004.
Abstract
We investigated the formation of Fe1−xSix phases in the interfacial region of Fe/Si and Fe/FeSi multilayers (MLs). The amount of Fe1−xSix
phases formed in Fe/Si MLs depends on Si layer thickness and this
amount corresponds to the reduction of saturation magnetization and
averaged hyperfine field (Hhf). On the other hand, the reduction of magnetization and averaged Hhf
in Fe/FeSi MLs seems not to depend on the FeSi layer thickness; that
is, the interface of Fe/FeSi MLs is more stable and a formation of
nonmagnetic Fe1−xSix phases is not expected.
Keywords: Structure; Magnetization; Multilayers; Mössbauer spectroscopy—conversion electron
PACS: 68.35.Ct; 75.75.+a; 76.80.+y
(39K)
Fig. 1. Magnetization curves of [Fe (2 nm)/Si (1 nm)]
30 MLs and [Fe (2 nm)/FeSi (1.16 nm)]
30 MLs.
(62K)
Fig. 2. CEM spectra and the distributions of
Hhf in [Fe (2 nm)/Si (1 nm)]
30 MLs and [Fe (2 nm)/FeSi (1.16 nm)]
30 MLs.
Table 1.
Nominal and estimated values of bilayer periods in Fe/Si MLs and Fe/FeSi MLs
| Sample | Nominal period (nm) | Estimated period (nm) |
| Fe (2 nm)/Si (1 nm) | 3 | 2.72 |
| Fe (2 nm)/Si (1.5 nm) | 3.5 | — |
| Fe (2 nm)/FeSi (1.16 nm) | 3.16 | 3.17 |
| Fe (2 nm)/FeSi (1.74 nm) | 3.74 | 3.86 |
Table 2.
Ratios of magnetization and averaged
Hhf in Fe/Si MLs and Fe/FeSi MLs to bulk Fe value
| Sample | Reduced magnetization |
| VSM | CEMS |
| Fe (2 nm)/Si (1 nm) | — | 0.66 |
| Fe (2 nm)/Si (1.5 nm) | 0.59 | 0.56 |
| Fe 2 nm/FeSi (1.16 nm) | — | 0.80 |
| Fe 2 nm/FeSi (1.74 nm) | 0.80 | 0.82 |
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