Mössbauer studies of thermal excitations in magnetically ordered microcrystals

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1970
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A simple model is developed to explain the often-observed diminished values of the magnetic hyperfine fields in microcrystals. It is shown that below the superparamagnetic blocking temperature thermally excited oscillations of the magnetization around an energy minimum reduce the average magnetization and the magnetic hyperfine splitting in the Mössbauer spectrum. In a microcrystal of volumeV these quantities are reduced by a factor of about 1−kT/(2κV), wherekT is the thermal energy and κ is related to the anisotropy constant. Mössbauer spectra of 60 Å, 100 Å, and 120 Å Fe3O4 particles and 120 Å α-Fe2O3 particles show excellent agreement with the theory.
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Authors Steen Mørup;Henrik Topsøe;Steen Mørup;Henrik Topsøe;
Journal applied physics
Year 1970
DOI doi:10.1007/BF00895017
URL
https://doi.org/10.1007%2FBF00895017
Keywords
nanotechnology manufacturing condensed matter physics Machines Tools Processes characterization and evaluation of materials optical and electronic materials surfaces and interfaces thin films

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