Two mechanisms are examined underlying the formation of the magnetic hyperfine structure in the Mossbauer spectra of magnetic materials containing nanoparticles. The absorption spectra of 57Fe nuclei in Fe-Cu-Nb-B nanostructured magnetic alloys are evaluated within the generalized two-level relaxation model, which includes interparticle interaction. All the unconventional features of the spectra are thus explained in qualitative terms. Furthermore, the precession of the magnetic moments of nanoparticles in a magnetic anisotropy field is investigated. It is shown that in a precessing hyperfine field the nuclear g factors should be subject to renormalization. As a result, the hyperfine spectra should undergo a radical transformation. It is concluded that the conventional techniques of Mossbauer-spectra evaluation in the context of nanostructured magnetic materials should be modified to include the transformation.
Russian Microelectronics – Springer Journals
Published: Sep 27, 2005
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