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The measurement of the anisotropy field of single "tape" particles

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1 Author(s)
Knowles, J.E. ; Philips Research Laboratories, Redhill, Surrey, England

The uniaxial anisotropy field Haof nominally single acicular particles was measured by three different methods, and the coercivity was also found. A very dilute suspension was made in a viscous liquid, and a particle observed with the microscope. Various types of magnetic field were then applied, and the particle's change in orientation enabledH_{a}, H_{c}and/or Hrto be determined. One method gave anomalously low values for Ha, but it was possible to reconcile the results. The larger values lay in a range consistent with the chain-of-spheres and prolate ellipsoid models. There was a linear relationship between Haand Hr(or Hc). The results suggested new reversal mechanisms.

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Magnetics, IEEE Transactions on  (Volume:20 ,  Issue: 1 )