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By T. H. O’Dell (auth.)

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131-136). 6. 10. The kink instability of a linear conductor carrying a constant current. The magnitude of the force is indicated by the length of the arrows. have to consider later in connection with the bubble domain. This additional energy term will be increased if the length of the wall increases so that it acts as a stabilizing force. The strip domains also lose their tendency to kink when the applied field B 0 is very high. This is because the two walls are brought very close together and the kink instability of one wall inhibits the instability of its neighbour, allowing the domain wall energy term to have a larger stabilizing effect.

If the strip is narrower than this, B exceeds B 0 and the strip expands towards A. If the strip is too wide, B 0 predominates and the strip contracts towards A. 9. The strip domain is stable at the point A when the applied field is B0 as shown. It is interesting to note that, in this analysis, we have only considered the force on the strip domain wall due to the externally applied field, B0 , and the field, B, due to the neighbouring wall. We have said nothing about the force upon the wall due to its own field.

Almasi et al. (1972), for example, describing their device work with particular reference to detectors, used 4~tm diameter bubbles in 4·7 ~tm thick layers of Eu 0 . 6 Y 2 . 4 Fe 3 . 9 Ga 1 . 1 0 12 . The experimental devices described by Chang et al. (1972) were fabricated on 13~tm thick layers of Gd 2 . 24 Sm 0 . 1 Tb 0 . 66 Fe 5 0 12 which had a value of A= 0·33~tm so that the value of A/h was only 0·025. 22 shows, allowed stable bubbles with a diameter of about 16A to be used and this Magnetic Bubbles 56 was large enough to suit the overlay patterns being used in these devices.

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