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By T. H. O’Dell (auth.)

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Extra resources for Ferromagnetodynamics: The dynamics of magnetic bubbles, domains and domain walls

Example text

The 'Neel wall' would be expected in such thin mms because it has no external magnetic field and this would add a significant amount to the total wall energy when the mm is very thin. We shall consider a domain wall of very similar structure in chapter 3. 8 Experimental Evidence for the Landau-Lifshitz Structure Let us now look at what experimental evidence there is for testing these various one-dimensional models. The Landau-Ilfshitz wall is distinctly different to the other wall structures discussed above in that it produces an external magnetic field.

6 The Structure of the Landau-Lifshitz Wall To make the Landau-Ufshitz wall a little less artificial we can return to our discussion in chapter 1 concerning the contrast between the kind of domain walls expected in picture frame samples and in bubble domain materials. 2. This represents part of a picture frame sample, perhaps 1 mm thick and a few mm wide, and has a very narrow domain boundary between two domains which are both saturated along the z-axis, in opposite directions, this being the easy direction of magnetisation.

There is no question of applying the analysis given in this chapter to bubble domain materials or very thin fIlms. 4, immersed in the applied field Bz . 4, is magnetised in the same direction as the applied field and consequently grows through the motion of the wall to the right with velocity vy . Our diagram only shows M in the two domains and at the centre of the wall. 38) and, following the argument given above, we consider one convenient point within the wall. We choose the centre whereMx =Ms,My = 0.

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