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By T. H. O’Dell (auth.)

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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. 3 The Magnetic Bubble Domain We can now consider the magnetisation of the bubble domain itself.

Jh = 0·1, superimposed. It can be seen that strip domains, A, and bubble domains, B, may coexist in the same applied field B 0 . 15, have been superimposed. It can be seen that infinitely long strips, point A, and bubbles, point B, can exist supported by the same field. 8. 18 which shows the range of diameters which an isolated bubble may have between collapse and run out and its degeneration after run-out into an infinite strip domain. We have already obtained expressions for the field and diameter at which bubble collapse will occur and our problem now is to calculate the run-out field, BRo, and the run-out diameter, DRO.

4) (Sommerfeld 1952, p. 13, Feynman 1964, p. 13-4). 4) follows the same path and will have a length 2h. 4) is simply 2hB. 3). In a typical bubble domain device we would be dealing with a thin layer for which hand D would be ofthe order of 5 x 10- 6 m and 10- 2 m, respectively. , and would be such that p. 0 M. ~ 200 x 10- 4 T. 3) that the magnetic field at the centre of such a thin layer, due to its own magnetisation, would be only 0·1 x 10- 4 T. Such a small field would be Magnetostatics 31 quite negligible in a practical device.

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