Mössbauer studies of spin flop in antiferromagnetic hematite

N. Blum, Arthur J Freeman, J. W. Shaner, L. Grodzins

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The antiferromagnetic sublattice magnetizations below the Morin transition temperature TM≈260°K, are parallel and antiparallel to the trigonal axis of rhombohedral α-Fe2O3. Experiments at 80°K, using the Mössbauer technique together with high external magnetic fields on both polycrystalline and single-crystal samples, show that the directions of the sublattice magnetizations flop from along the trigonal axis for the applied field H0c to perpendicular to the trigonal axis for H0>Hc; Hc is found to be 67.5±3 kOe. In the polycrystalline sample this behavior is exhibited through the occurrence of a maximum in the width of the outer lines of the Mössbauer spectrum plotted as a function of H0. In the single crystal, which is oriented so that the gamma rays propagate along the [111] direction, the magnetic transition is clearly observed as a sudden qualitative as well as quantitative change in the appearance of the Mössbauer hyperfine spectrum; below the critical field the Δm=0 lines are the strongest components of the six-line spectrum.

Original languageEnglish
Pages (from-to)1169-1170
Number of pages2
JournalJournal of Applied Physics
Issue number3
Publication statusPublished - 1965

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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