Transition Region in Recorded Magnetization Patterns

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Abstract
Various theoretical approaches have been recently offered to describe the writing and demagnetization processes in magnetic recording. All invariably correlate their calculations with readback pulse measurements, thus clouding their results with the dominant readback losses. In this paper a self‐consistent iterative approach was used to calculate the demagnetization in an isolated recorded transition between two areas of opposite magnetization, as a function of the coercivity, remanence, and thickness of the recording medium. Lorentz transmission microscopy was used to verify the predictions of the theoretical calculations. For this purpose, a series of thin magnetic films of different magnetic properties and thicknesses were prepared and then recorded with an inductive‐type transducer. The magnetization transition regions were observed to resemble a sawtooth structure. The walls of the sawtooth were inclined towards the easy magnetization direction, and the magnetization on either side of these walls was not equinormal. The size of the sawteeth varied with the magnetic properties and the thickness of the films. The average height of the sawteeth correlated well with the theoretically predicted transition regions.

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