Magnetization Distribution of Film Edge Region Under a Spatially-Decreasing External Filed

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The magnetization distribution of a magnetic curling state in a film edge region is analyzed under a spatially-decreasing field such as an external field from magnetically-recorded bits. A newly developed curling-state analysis is presented which takes the total magnetostatic energy due to surface and volume charges into consideration. The analysis gives the magnetization distribution of the curling state in the film edge region under the spatially-decreasing field. It further enables the energy factors to be evaluated quantitatively to determine the magnetization distribution of the curling state. Finally, it also demonstrates quantitatively that the magnetostatic energy cannot be neglected in determining the magnetization distribution of the film, and the energy suppresses magnetic induction for a high-magnetization film under the spatially-decreasing field.

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