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.
Highlights
Reducing the transition noise is essential for increasing the areal density of hard disks (HDs) [1], [2]
We investigated the influence of record- ing field direction on the transition noise of stacked media by using the magnetic printing for recording
Both the stray field fluctuation along the cross-track direction in the transition area and the dispersion of the transition position of the recorded medium decreased as the applied field angle increased from the perpendicular direction
Summary
Reducing the transition noise is essential for increasing the areal density of hard disks (HDs) [1], [2]. Perpendicular HDs have been developed by mainly using stacked media and single pole heads with a trailing shield. Recording heads with a trailing shield enhance the magnetization reversal of the recording layer due to increase of in-plane component of magnetic field [4]. Relationship between the in-plane component of recording field and the transition noise has not been elucidated yet. We clarified that domain structure in demagnetized media depends on the applied field direction for demagnetization, and that demagnetization with an in-plane field causes sub-domain structure, with consequent noise reduction [5], [6]. We experimentally investigate the influence of recording field direction, namely the in-plane component of recording field on the transition noise of the stacked media
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