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Cobalt--Ferrous ferrite with re-entrant hysteresis loop

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2 Author(s)
Edwards, G. ; Standard Telecommunication Laboratories, Harlow-Essex, England ; Glaister, R.

If the field Hrrequired to initiate flux reversal exceeds the Hwrequired to continue reversal, a re-entrant hysteresis loop results. This has been observed in magnetically annealed cobalt-ferrous ferrites in which Hrat 10 to 20 Oe may be as high as 1.5 \times H_{w} at room temperature. Frequently, these ferrites are bistable and show no minor loops. Flux reversal appears to involve only one domain wall, giving rise to high squareness but slow switching ; typical values for a 12-mm toroid are R_{s} = 0.99 and s = 540 \mu s Oe. Intermediate stabilized magnetization states have been introduced into these materials by a simple annealing procedure. Switching now occurs between three or more magnetization states, providing the basis for a multistable device. Details of preparation and measurement are given and the results discussed in terms of various models.

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Magnetics, IEEE Transactions on  (Volume:2 ,  Issue: 4 )