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Domain structure of stacked media demagnetized with perpendicular or in-plane demagnetization field is investigated using MFM. For a demagnetized medium (sample A), the domain size is approximately 50 nm regardless of demagnetization field direction, while the contrast of the MFM image for the in-plane demagnetized sample is lower than that for the perpendicularly demagnetized sample. The domain of sample B where the cap layer was etched from the sample A is similar to that of the sample A in case of perpendicular demagnetization, which shows the domains of the cap and granular layers are integrated. Meanwhile, in case of in-plane demagnetization, the domain of the sample B is hardly observed, which suggests the domains of the cap and granular layers of the sample A are not integrated, and it is probable that the sub-domain structure is formed in the cap layer. The domain of sample C demagnetized in-plane after etching the cap layer from the stacked medium is hardly observed like the sample B, which shows that the domain of the granular layer of the sample A is not affected by the cap layer.

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Abstract. Influence of recording filed direction on transition noise of stacked media was investigated by using magnetic printing for recording and MFM images. Stray field fluctuation along the cross-track direction in the transition area and dispersion of the transition position of the recorded medium decreased as the applied field angle increased from the perpendicular direction. This shows that the transition noise decreases with increasing in-plane component of the recording filed. On the other hand, in the transition area domain size which corresponds to half of the period of the stray field fluctuation was fixed near 50 nm regardless of the applied field direction.