Control of wall coercivity and its effect on dynamic characteristics in magneto-optic materials

Satoh, Takashi; Takatsuka, Yuji; Yokoyama, H.; Tatsukawa, S.; Mori, T. J. A.; Yorozu, Takehiko

doi:10.1109/20.278758

Cited by 14 publications

(8 citation statements)

References 20 publications

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“…The discrepancies of the recording characteristics on externally applied field are attributed to the different domain wall mobility [7,8]. The domain walls are being anchored to strong pinning sites after the nucleation and prevent the multi domains from collapsing.…”

Section: Resultsmentioning

confidence: 99%

“…high magnetic sensitivity also improves the MFM recording characteristics. The improvement of the response of carrier level to external applied magnetic field was reported by the plasmaetching treatment of silicon nitride (SiN) underlayer prior to the magneto-optic layer deposition [7,8]. However, the noise level at a low magnetic field is also increased by the etching treatment.…”

Section: Introductionmentioning

confidence: 99%

“…Satoh et at. [7] proposed that the low wall coercivity, which acts as a frictional force impinged on pinning site, is related to the recording characteristics of samples with etching treatment. The domain walls in samples without etching treatment are being anchored to some pinning site after the nucleation and prevent the multi domains from collapsing.…”

Section: Introductionmentioning

confidence: 99%

“…The domain walls in samples without etching treatment are being anchored to some pinning site after the nucleation and prevent the multi domains from collapsing. The conspicuous apparent difference between etched and unetched samples is the surface roughness of the nitride underlayer [7,8]. It is therefore thought that the interfacial structure may influence the magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Interface Structure on Domain Wall Energy

Liang

Chen

1995

J. Magn. Soc. Jpn.

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Plasma etching treatment of SiN underlayer was performed to enhance the magnetic sensitivity of TbFeCoCr magnetic-optic disc which facilitates the magnetic-field-modulation direct overwriting behavior. The effect of plasma etching on the interfacial structure was investigated by high-resolution electron microscopy and stress measurements. The ordered structure at the interface between SiN underlayer and MO layer was observed for samples with highly etched underlayer. Compressive residual stress was induced by the plasma etching of SiN underlayer. The results suggest that the magnetic sensitivity is improved by less pinning sites and the lower domain wall energy density at the interface.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effect of Interface Structure on Domain Wall Energy

Liang

Chen

1995

J. Magn. Soc. Jpn.

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“…Fig. 2 To simulate laser heating of the medium, thermal contours with a Gaussian profile [7] are applied to the medium. The profile width is 0.78 m and is symmetric along the track and across the track.…”

Section: Micromagnetic Modelmentioning

confidence: 99%

Micromagnetic modeling of the thermomagnetic recording process

Hoinville¹

2001

IEEE Trans. Magn.

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A thermally-activated micromagnetic model has been developed to model the thermomagnetic recording process. In this model the crystal anisotropy, , and saturation magnetization, , of each grain depend on temperature. To model the thermomagnetic recording process a high-coercivity, , medium is heated with a thermal profile from a laser so that the medium is near its Curie point. In this state transitions are written with a Karlquist type write head. Thermomagnetically-written transitions are distinguished by curved transitions and sharp track-edges with no erase bands. Results are presented which discuss the steps required to optimize the thermomagnetic recording process.Index Terms-High density recording, longitudinal recording, magnetics and microstructure, magneto-optical media, magneto-optical systems, superparamagnetic limit, unusual data storage methods.

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Magnetic field modulation recording with multipulse laser irradiation on magnetooptical disk drive

Kawasaki

Sohmuta

1994

Electron Comm Jpn Pt II

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A magnetooptical disk driver which adopts the magnetic field modulation recording scheme has been developed for filing data. to apply the magnetic field modulation magnetooptical file system, such as a minidisk, to personal computers, essential technology must be developed. A noncontact magnetic head type and active spacing system were adopted to achieve high reliability and accessibility. To avoid system disturbance due to the weight increase in the head, linear motors were used to achieve independent motion of the optical head and magnetic head. A sputter‐etching treated magnetooptical disk was developed as the magnetic field modulation medium for low‐field recording. to cope with low‐field noise during magnetic field modulation recording, multipulse laser irradiation was used. In this method, the magnetized segment had a sharp edge even when the magnetic field was weak, resulting in a reduction of jitter in the playback of the signal. Using the foregoing technologies, a test driver for recording and playback using the compact disk (CD) format was evaluated. In the test, the jitter value was less than 20 ns and the block error rate was on the order of 10−4.

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Control of wall coercivity and its effect on dynamic characteristics in magneto-optic materials

Cited by 14 publications

References 20 publications

The Effect of Interface Structure on Domain Wall Energy

The Effect of Interface Structure on Domain Wall Energy

Micromagnetic modeling of the thermomagnetic recording process

Magnetic field modulation recording with multipulse laser irradiation on magnetooptical disk drive

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