Magnetic recording at a data rate of one gigabit per second

Liu, F.H.; Shi, Shengjie; Wang, J.; Chen, Y.; Stoev, K.; Leal, L. Gary; Saha, Rafikul Ali; Tong, Ho‐Ming; Dey, Subrata Kumar; Nojaba, M.

doi:10.1109/20.917590

Cited by 25 publications

(9 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Excellent field gradients at greater than 90 Oe/nm can be achieved with dynamic media coercivities of about 9000 to 10 000 Oe [10]. Assuming the ratio of dynamic coercivities at relatively high data rates to that of vibrating sample magnetometry (VSM) coercivities to be about a factor of 2 [11], optimized recording of perpendicular media with VSM coercivity of about 4500 to 5000 Oe can thus be achieved with this advanced probe head.…”

Section: A Basic Probe Head Design and Modelingmentioning

confidence: 95%

Advanced probe head for perpendicular recording

et al. 2002

Self Cite

View full text Add to dashboard Cite

Basic design and recording performance of the advanced probe heads are described. Excellent writability of the advanced probe heads is demonstrated by a series of overwrite (OW) and nonlinear transition shift (NLTS) saturation measurements. Write currents as low as 5 mA o p are required for recording. Excellent OW can be obtained with both high and low OW ratios. Media with vibrating sample magnetometry coercivities as high as 7000 Oe can be recorded with OW of 30 dB. Better than 14 dB of NLTS was measured at a linear density of 600 kfci. Minimal side-writing has been observed using the advanced probe heads with square pole shape. External field sensitivity of the advanced probe heads has also been shown to be excellent as larger than 58 Oe of external field is required to erase a low density signal on a 3380-Oe disk. Modeling results also show that the basic architecture of advanced probe head is extendible to 0.1-m square pole.Index Terms-Finite-element model, high areal density magnetic recording, perpendicular recording.

show abstract

Section: A Basic Probe Head Design and Modelingmentioning

confidence: 95%

Advanced probe head for perpendicular recording

et al. 2002

Self Cite

View full text Add to dashboard Cite

show abstract

“…It also appears that perpendicular recording [1] is becoming a next-generation candidate [2] as a result of its advantage over longitudinal recording in the area of thermal stability. Areal density [3]- [8] and 1-Gb/s data-rate demonstrations [8]- [11] exist for both longitudinal and perpendicular recording suggesting growth beyond present day limits are possible. It is the ultimate frequency response of the head and write channel that we wish to explore in this paper.…”

Section: Introductionmentioning

confidence: 99%

High-frequency inductance measurements and performance projections made for cusp-field single-pole heads

et al. 2003

View full text Add to dashboard Cite

High-frequency measurements of the inductance of cusp-field single-pole heads for perpendicular recording are made out to 13.5 GHz to determine their performance. The inductance of the pole heads examined are typically 1.2-1.9 nH with a self resonance at about 7-10 GHz. Inductance versus current measurements allow construction of the nonlinear eddy-current damped, thin-film head model. Comparison is made to a longitudinal recording head of similar size and turns. The effect of the medium underlayer as part of the head return path is shown to have minimal effect on the head inductance. Contact Tri-Pad heads are used to demonstrate the changes produced by the underlayer and to demonstrate apex and yoke saturation. The contact behavior is similar to that for a longitudinal thin-film head. The frequency dependence of the pole material permeability is discussed. The conclusions provide a practical bit rate limit for the cusp-field head based on head and write channel modeling, experimental high-frequency inductance data, and spin reversal considerations.Index Terms-High-frequency performance, nonlinear eddycurrent damped head model, single-pole cusp-field head.

show abstract

“…Increasing linear density and faster access time drives rapid acceleration of data rate. Previous high data rate recording demonstrations have used experimental write drivers [1], [2]. In this paper, we will review the design, process, and performance of IBM's advanced write heads for high density and high data rate applications, using both product-level and experimental write drivers.…”

Section: Introductionmentioning

confidence: 99%

Advanced write heads for high density and high data rate recording

et al. 2002

View full text Add to dashboard Cite

Advanced write head designs improve write efficiency, by reducing yoke length to less than 15 m, adapting a sunken coil/P1 pedestal structure with stitched pole, and utilizing high moment poles with greater than 2 Tesla moment. Sufficient bit-error rate was achieved up to 680 kBPI, using heads with 50-60 GB/in 2 dimensions. For wider track width heads, spin-stand testing showed good writing parametrics and soft error rate up to 1.0-1.1 Gb/s channel data rate, with product electronics and channels. Feasibility of high-speed recording up to 1.5 Gb/s is demonstrated using experimental write drivers.Index Terms-High data rate, high moment, write head.

show abstract

Magnetic recording at a data rate of one gigabit per second

Cited by 25 publications

References 13 publications

Advanced probe head for perpendicular recording

Advanced probe head for perpendicular recording

High-frequency inductance measurements and performance projections made for cusp-field single-pole heads

Advanced write heads for high density and high data rate recording

Contact Info

Product

Resources

About