Perpendicular Anisotropy Master Medium in Magnetic Printing for Writing High-Density Servo Signal

The influence of the recording field direction on the linearity of the transition is investigated when a signal is recorded on hard disks whose recording layers have the stacked structure. It is found that the linearity of the transition increases with increase of the ratio of the in-plane component of the recording field to the perpendicular one, and the recording field direction dependence of the transition linearity is tolerant to the variation of the recording layer structure. It is inferred that the magnetization distribution in the transition area reflects the demagnetized domain structure, that is to say, the linearity of the transition increases since the magnetization of both upper and lower layers gets to be reversed separately with increase of the ratio of the in-plane component of the recording field to the perpendicular one.

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“…The signal was recorded onto each medium using a magnetic printing method [10]. A schematic illustration of the recording method is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Influence of Recording Field Direction on Linearity of Transition in Hard Disk Media With Stacked Structure

2015

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“…Signals were recorded onto an HD by magnetic printing [7]. A schematic illustration of recording process is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Influence of recording field direction on transition noise of stacked media

Tomiyama

Oyama

Sato

et al. 2014

EPJ Web of Conferences

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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.

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“…In order to investigate the magnetization reversal process in the stacked media, magnetic printing [8] was used as recording technique in the simulation. Fig.…”

Section: Calculation Methodsmentioning

confidence: 99%

Effect of layer thickness ratio on magnetization reversal process in stacked media with high coercivity

Oyama

Sugita

2014

EPJ Web of Conferences

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Abstract. Effect of thickness ratio and interlayer exchange coupling on time-evolutional magnetization reversal process in stacked media with high coercivity was investigated by utilizing micromagnetic simulation. Regardless of the layer thickness ratio, for each stacked medium the magnetization reversal process is divided into three regions, namely the spin-flop rotation, the incoherent rotation and the coherent rotation along with increase of the interlayer exchange coupling constant A interlayer . In order to get the incoherent rotation region which is suitable for the recording media, it is required that the A interlayer is between about 1.3×10 -7 and 2.2×10 -7erg/cm for the media with the layer thickness ratio of 1 : 3 and 3 : 1, and that one is between about 1.8×10 -7 and 2.5×10 -7 erg/cm for the media with the ratio near 1 : 1.

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Perpendicular Anisotropy Master Medium in Magnetic Printing for Writing High-Density Servo Signal

Cited by 18 publications

References 9 publications

Influence of Recording Field Direction on Linearity of Transition in Hard Disk Media With Stacked Structure

Influence of Recording Field Direction on Linearity of Transition in Hard Disk Media With Stacked Structure

Influence of recording field direction on transition noise of stacked media

Effect of layer thickness ratio on magnetization reversal process in stacked media with high coercivity

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