Influence of unequal magnetization direction probabilities on the Mössbauer spectra of superparamagnetic particles

Phys. Rev. B 29, 2410 – Published 1 March 1984
D. G. Rancourt and J. M. Daniels

Abstract

The effect of unequal magnetization direction probabilities is most distinctly recognized when the superparamagnetic relaxation frequencies are between about 10 and 103 times the Mössbauer measurement frequency (fm0.5×108 Hz). In this frequency range, two features which are commonly associated with the Mössbauer spectra of superparamagnetic particles (a quadrupole-doublet contribution and a broad distribution of hyperfine fields) can be artifacts of an interpretation which assumes equal magnetization direction probabilities. When the frequency is larger than about 103fm and if the probabilities are sufficiently different, a "superferromagnetic" state exists and represents a new mechanism for the observed reduced hyperfine splittings of particles below their blocking temperature.

DOI: http://dx.doi.org/10.1103/PhysRevB.29.2410

  • Received 25 October 1983
  • Published in the issue dated 1 March 1984

© 1984 The American Physical Society

Authors & Affiliations

D. G. Rancourt and J. M. Daniels

  • Department of Physics, University of Toronto, Toronto, Ontario M5S1A7, Canada

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