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Magnetic anisotropy of cobalt-doped gamma ferric oxide

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1 Author(s)
Koster, E. ; BASF AG, Ludwigshafen, Germany

The relative remanence and the remanence coercivity of acicular single domain cobalt-doped gamma ferric oxide particles have been measured as a function of temperature and cobalt concentration. In addition, the magnetocrystalline anisotropy field of the same material has been measured separately on cubic shaped particles in the temperature range of 140-420°K and over a concentration range of 1.5- 14.5 wt % Co. The relative remanence of the acicular particles increases strongly with decreasing temperature below a temperature TKat which the ratio of shape to magnetocrystalline anisotropy is 0.86. TKis independent of a partial alignment of the particles. At temperatures below Tk, the remanence coercivity HRis found to follow reasonably well Néel's relation for crystalline anisotropy, HK= 0.32 HK.

Published in:

Magnetics, IEEE Transactions on  (Volume:8 ,  Issue: 3 )

Date of Publication:

Sep 1972

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