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Phys. Rev. B 58, 8590–8595 (1998)

[Issue 13 – 1 October 1998 ]

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Magnetic behavior of probe layers of ⁵⁷Fe in thin Fe films observed by means of nuclear resonant scattering of synchrotron radiation

L. Niesen, A. Mugarza^*, and M. F. Rosu

Nuclear Solid State Physics, Materials Science Centre, Groningen University, Nijenborgh 4, 9747 AG Groningen, The Netherlands

R. Coehoorn, R. M. Jungblut, and F. Roozeboom

Philips Research Laboratories, Box WA-14, 5656 AA Eindhoven, The Netherlands

A. Q. R. Baron^§, A. I. Chumakov, and R. Rüffer

European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble, France

The magnetic behavior of epitaxial probe layers of ⁵⁷Fe down to a thickness of 1 monolayer (ML) has been investigated with the technique of nuclear resonant scattering by synchrotron radiation (NRS) in a grazing-incidence geometry. The samples consisted of 10–55 ML Fe deposited onto a Ge(100) substrate and covered with 2 nm Au. Probe layers of 1–10 ML ⁵⁷Fe were inserted at different depths in the Fe film. The technique yields spectroscopic information, i.e., magnetic hyperfine fields and isomer shifts, as well as structural information, such as layer thicknesses and interface roughness. The results show the existence of a nonmagnetic Ge/Fe interlayer of at least 10 ML thick after deposition at room temperature. Subsequent conversion electron Mössbauer spectroscopy (CEMS) data show that, although the samples were stored at room temperature, the interlayer diffusion proceeds as a function of time. The relative merits of NRS and CEMS for the investigation of ultrathin layers are discussed.

©1998 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v58/p8590
DOI: 10.1103/PhysRevB.58.8590
PACS: 75.70.Ak, 75.70.Cn, 76.80.+y, 78.70.Ck

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