Longitudinal magnetic media designs for 60-200-Gb/in/sup 2/ recording

Bertero, G.; Malhotra, S.S.; Bian, Bo; Tsoi, J.; Avenell, M.; Wachenschwanz, D.; Yamashita, T.

doi:10.1109/tmag.2003.808987

Cited by 6 publications

(7 citation statements)

References 27 publications

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“…In the simulated -loop of a longitudinal medium shown in Fig. 1 crystalline anisotropy field of the Co-alloy in the disk thin film is set to be 10 000 Oe, the coercivity can be derived as 4200 Oe, which agrees with experiment [1], [2].…”

Section: Composite Simulation Models Of Hard Disk Drivessupporting

confidence: 65%

“…The magnetic field penetrating into the gap between the shields is higher in a GMR head with a narrower normalized width . The normalized read-back voltage can be found by (1) where the angle of magnetization in the pinned layer of the GMR element equals . A minus-to-plus transition down the track has a negative magnetic poles, the angles in Fig.…”

Section: Composite Simulation Models Of Hard Disk Drivesmentioning

confidence: 99%

“…Today's linear density is nearly 1000 kilo-flux changes per inch (kfci); the corresponding track density to achieve a 100 Gb/in areal density is over 100 kilo-tracks per inch (ktpi) [1], [2]. Therefore, it is of great interest to analyze the ultranarrow-track recording for the realization of areal density above 100 gigabits per square inch (Gb/in ).…”

Section: Introductionmentioning

confidence: 99%

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Studies of Deep-Submicrometer Ultranarrow-Track Recording by Composite Simulation Models

Liang¹,

Zhang

Dong

2004

IEEE Trans. Magn.

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This paper presents an analysis of the signal and noise in deep-submicrometer ultranarrow-track disk recording by composite simulation models, including the micromagnetics in longitudinal media and giant magnetoresistive (GMR) multilayers and the surface finite-element methods for inductive thin film heads and GMR head shields. The analysis assumes that the linear density of the recording process is in a range of 57 to 1200 kilo-flux changes per inch (kfci) and the width/gap ratio of the write head is between 4 and 2, corresponding to current industry practice. The first to fifth harmonics of all-one signals are found by the simulated spectrum. The signal and noise at different track densities and linear densities are analyzed by the harmonics in the spectrum. The composite heads in the disk recording system with widths 160, 240, and 320 nm are evaluated by the signal-to-noise ratio at a linear density around 1000 kfci.Index Terms-Deep-submicrometer track width, longitudinal recording, magnetic heads, micromagnetic, signal-to-noise ratio.

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Section: Composite Simulation Models Of Hard Disk Drivessupporting

confidence: 65%

Section: Composite Simulation Models Of Hard Disk Drivesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Studies of Deep-Submicrometer Ultranarrow-Track Recording by Composite Simulation Models

Liang¹,

Zhang

Dong

2004

IEEE Trans. Magn.

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“…Tremendous progress has been made in increasing the areal density—the number of bits per unit area formed on the magnetic material surface ( 1 – 10 ). However, because of the superparamagnetic limit ( 1 ), the areal density of longitudinal magnetic recording and perpendicular magnetic recording techniques is restricted to 100 Gbit/in 2 ( 2 , 3 ) and 1 Tbit/in 2 ( 4 ), respectively. The areal density can be further increased by adopting novel recording and patterning methods, such as heat-assisted magnetic recording ( 6 , 7 ) and bit-patterned media ( 8 , 9 ) where the hybrid recording head and patterned magnetic grains are used.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional supercritical resolved light-induced magnetic holography

Hao

Nie

et al. 2017

Sci. Adv.

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“…Disk drives record information via magnetic domains with lengths in the range of 27 to 38 nm and track pitches in the range of 115 to 280 nm. 1) A recent typical digital versatile disc (DVD) prototype system with a 405 nm light source employed an amorphous bit length of 126.9 nm with a land/groove width of 340 nm. 2) Advanced recording schemes that propose to drive bit sizes even smaller have incorporated the near-field scanning optical microscope, 3) nanofocusing probes 4) and solid-immersion lens 5) technologies.…”

Section: Introductionmentioning

confidence: 99%

Electron-Beam Detection of Bits Reversibly Recorded on Epitaxial InSe/GaSe/Si Phase-Change Diodes

Chaiken

Gibson

Chen

et al. 2006

jjap

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We demonstrate a data read-back scheme based on electron-beam induced current in a data storage device that utilizes thermal recording onto a phase-change medium. The phase-change medium is part of a heterojunction diode whose local charge-collection efficiency depends on the crystalline or amorphous state of a bit. Current gains up to 65 at 2 keV electron beam energy have been demonstrated using InSe/GaSe/Si epitaxial diodes. Fifteen write-erase cycles are obtained without loss of signal contrast by using a protective cap layer and short write pulses. 100 write-erase cycles have been achieved with some loss of contrast. Erasure times for the bits are longer than in similar polycrystalline In-Se media films. Possible reasons for the long erasure times are discussed in terms of a nucleation-or growth-dominated recrystallization. Prospects for extension to smaller bit sizes using electron-beam writing are considered.

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Longitudinal magnetic media designs for 60-200-Gb/in/sup 2/ recording

Cited by 6 publications

References 27 publications

Studies of Deep-Submicrometer Ultranarrow-Track Recording by Composite Simulation Models

Studies of Deep-Submicrometer Ultranarrow-Track Recording by Composite Simulation Models

Three-dimensional supercritical resolved light-induced magnetic holography

Electron-Beam Detection of Bits Reversibly Recorded on Epitaxial InSe/GaSe/Si Phase-Change Diodes

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