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Magnetic properties of thin Cr layers in multilayer systems studied through ¹¹⁹Sn Mössbauer probes

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Journal of Magnetism and Magnetic Materials

Volumes 198-199
1 June 1999
Pages 689-691

PII: S0304-8853(98)01201-3
Copyright © 1999 Elsevier Science B.V. All rights reserved.

K. Mibu ^,^,^a, S. Tanaka^a, T. Kobayashi^b, A. Nakanishi^b and T. Shinjo^a

^a Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611-0011, Japan
^b Department of Physics, Shiga University of Medical Science, Otsu, Shiga 520-2192, Japan

Available online 7 January 2000.

The magnetic properties of thin Cr layers in epitaxial [Cr(t_Cr)/Sn(2 Å)] (t_Cr=5, 10, 20, 30, and 40 Å) and [Fe(10 Å)/Cr(5 Å)/Sn(2 Å)/Cr(5 Å)] multilayers were studied through ¹¹⁹Sn conversion electron Mössbauer spectroscopy. It was found that the magnetic ordering temperature of Cr in both Cr/Sn and Fe/Cr/Sn/Cr systems is much higher than the Néel temperature of bulk Cr (i.e. 311 K). It also turned out that the magnetic hyperfine fields at the Sn nuclear sites are quite different, i.e., 11_¯13 T for the Cr/Sn multilayers and 2 T for the Fe/Cr/Sn/Cr multilayer at 300 K, in spite of the similarity of the local crystallographic structure of the Sn probe layers. Possible magnetic structures of the Cr layers are inferred from the size and direction of the magnetic hyperfine field transferred at the Sn nuclear sites.

Author Keywords: Epitaxial multilayers; Mössbauer spectroscopy; Magnetic hyperfine field

References

(3K)
Fig. 1. (a) ¹¹⁹Sn Mössbauer spectrum for [Cr(30 Å)/Sn(2 Å)] at room temperature. The fitting line is also shown by the solid line. (b) The distribution of magnetic hyperfine fields obtained from the fitting of the spectrum for [Cr(30 Å)/Sn(2 Å)].

(3K)
Fig. 2. ¹¹⁹Sn Mössbauer spectra for [Cr(t_Cr)/Sn(2 Å)] (t_Cr=40, 20, 10, and 5 Å) at 300 K.

(2K)
Fig. 3. ¹¹⁹Sn Mössbauer spectra for [Fe(10 Å)/Cr(5 Å)/Sn(2 Å)/Cr(5 Å)] at 300, 100, and 15 K.

(1K)
Fig. 4. Temperature dependence of the hyperfine field (at the maximum in distribution) obtained from the ¹¹⁹Sn Mössbauer spectra for [Fe(10 Å)/Cr(5 Å)/Sn(2 Å)/Cr(5 Å)] in Fig. 3.

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Corresponding author. Tel./fax: +81-774-38-3109; email: mibu@scl.kyoto-u.ac.jp

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Journal of Magnetism and Magnetic Materials
Volumes 198-199
1 June 1999
Pages 689-691

215 of 238

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