EDP Sciences Journals List
Issue J. Phys. IV France
Volume 07, Number C1, Mars 1997
7th INTERNATIONAL CONFERENCE ON FERRITES
Page(s) C1-513 - C1-516
DOI http://dx.doi.org/10.1051/jp4:19971209

7th INTERNATIONAL CONFERENCE ON FERRITES

J. Phys. IV France 07 (1997) C1-513-C1-516

DOI: 10.1051/jp4:19971209

Origin of Elevated Ordering Temperature in MnFe2O4 Nanometer Particles

A.H. Morrish, Z.W. Li and X.Z. Zhou

Department of Physics, University of Manitoba, Winnipeg, MB R3T 2N2, Canada


Abstract
Mössbauer spectra of MnFe2O4 with various particle sizes in a longitudinal 50 kOe magnetic field show that the Fe ion occupancy of the A and B crystallographic sites depends on the particle size. The elevated Néel temperatures with decreasing particle sizes are attributed to an increased iron occupancy on the A sites ; this in turn leads to an increase in the total superexchange interaction.



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