The Effect of Angular Variations in Field on Fine-Particle Remanence

  • Eric D. Daniel
  • R. Noble
Conference paper


The Stoner-Wohlfarth model is used to calculate the remanence of a randomly-oriented assembly of single-domain particles when the applied field changes in direction. The cases considered are (1) fields applied successively in directions differing by multiples of 1/2π and (2) fields rotated through multiples of 1/2π. Some consideration is also given to the anhysteretic remanence when the unidirectional and alternating fields are orthogonal. Experimental results obtained on disks of γFe2O3 recording tape are found to be in reasonably good qualitative agreement with the calculations.


Good Qualitative Agreement Field Rotation Constant Strength Manent Magnet Critical Field Strength 
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    E. P. Wohlfarth, Research 8, S42 (1955).Google Scholar
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    E. C. Stoner and E. P. Wohlfarth, Phil. Trans. Roy. Soc. London A240, 599 (1948).ADSCrossRefGoogle Scholar
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    E. P. Wohlfarth, J. Appl. Phys. 29, 595 (1958).ADSCrossRefGoogle Scholar
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    S. Shtrikman and E. P. Wohlfarth, J. Appl. Phys. 32, 241S (1961), have made use of this result and calculated the corresponding solution for completely incoherent reversals.ADSCrossRefGoogle Scholar
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    E. P. Wohlfarth, Phil. Mag. 2, 719 (1957).ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1962

Authors and Affiliations

  • Eric D. Daniel
    • 2
  • R. Noble
    • 1
  1. 1.M. S. S. Recording CompanySlough, BuckinghamshireEngland
  2. 2.Memorex CorporationSanta ClaraUSA

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