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A neW.. mechanism by which viscous remanent magnetization, VRM, can be acquired is Proposed. This VRM probably is the major cause of overprinting during long magnetic polarity intervals.

The screening of domain moments associated with the displacement and pinning of a single domain wall from an initial energy minimum position is investigated . The domain moment acquired by the pinning of a domain wall in this fashion is reduced (or screened) by the subsequent readjustment of the non-pinned, mobile domain walls within the magnetic material. Although only a simple , one-dimensional domain geometry is considered, the screening effects are quite variable depending on the grain size, the number of domains and which wall is pinned. In all cases , however, the screening in grains with a few mobile domain walls is generally very large . The results of these screening calculations have important consequences regarding the grain size dividing stable from unstable remanence in multidomain grains.

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