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CONDENSED MATTER

Mössbauer spectra of magnetic nanoparticles in the model of continuous diffusion and precession of uniform magnetization

M. A. Chuev

Insitute of Physics and Technology, Russian Academy of Sciences

Abstract: A formalism based on the Brown kinetic equation has been developed to describe the Mössbauer spectra of magnetic nanomaterials in the presence of a continuous relaxation process with the inclusion of the diffusion and precession of uniform magnetization in the magnetic-anisotropy field of nanoparticles. Such a generalization of the relaxation model allows not only the inclusion of physical mechanisms of the formation of the magnetic hyperfine structure that are inherent in the system of single-domain magnetic nanoparticles but also an explanation of qualitative features observed in experimental spectra, in particular, the appearance of the magnetic-nature line doublets in these spectra in addition to the standard line sextets of the ⁵⁷Fe nuclei.

PACS: 61.18.Fs, 61.46.+w, 71.70.Gm, 75.60.Jp, 76.80.+y

Received: 17.05.2006

 English version: Journal of Experimental and Theoretical Physics Letters, 2006, 83:12, 572–577

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