The authors examine the requirements for 10 Gb/in/sup 2/ media, taking guidance from a recording model and known trends in high-performance media. They apply read/write to examining media properties required this density practical drive application. find that magnetic microstructural with concomitant noise supermagnetic limits demand significant improvements over existing extent revolutionary will likely be required.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...

A self-consistent write analysis using the Preisach model is presented and used to calculate overwrite in thin-film head/disk systems. Two characterization procedures are discussed, for each of calculated values compared with measurements. Through a correlation overwrite, nonlinear peak shifts, readback output voltage authors determine requirement. They show that whereas -30 dB will ensure satisfactory overall performance recording system, much lower say -20 dB, can work certain situations....

A critical review of existing head-disk interface modeling capabilities is given. Modeling two important technologies, miniaturization current air-bearing devices and viscoelastic bearings, e.g., VISqUS technology, studied in a unified manner. New developments are: (i) the Fokker-Planck equation adopted for rarefaction effects (instead Boltzmann equation) technology; (ii) systematic studies on incompressible liquid bearings are performed.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...

One of the challenges using magneto-resistive (MR) read elements in magnetic recording heads is control MR domain structure. It important to have tools available recognize and characterize effects multiple domains on output waveform across-the-track response. In this paper, it shown that response characteristics barber pole biased can be simulated with a finite element model. The results calculations for various states are compared data. From comparison, concluded an positioned gap...

The elimination of Barkhausen noise in order to attain stable read performance is primary interest magnetoresistive (MR) heads. One approach making MR elements make the effective uniaxial anisotropy field large with respect hard axis fields experienced during operation and storage. In addition providing a stabilizing effect, determines sensitivity element. A simple measurement at component level used evaluate effects lapping annealing. Analysis data, measured transfer functions, calculated...

The design, fabrication and peak shift characterization of a thin film head-thin media system capable recording at 19.4 Kbits/mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> (12.5 Mbits/in ) are described. uses magnetic layer sputter deposited alloy Co having coercivity 600 Oe. head is single-turn-inductive write, barber-pole-biased magnetoresistive read head. This combination write technologies reduces step coverage problems...

A method is presented for obtaining the longitudinal magnetic field produced by recording heads. The entails use of a microloop to directly measure perpendicular Hy across gap region head and calculation Hx using transform Hy(x). This has been applied study narrow-track, thin-film ability predict shape readback waveform from measurement demonstrated.

Here we introduce the concept of classical input – quantum output (C-Q) non-signalling boxes, a generalisation (C-C) boxes. We argue that studying such objects leads to better understanding relation between nonlocality and non-locality beyond mechanics. The main issue discussed in paper is whether there exist &amp;apos;genuine&amp;apos; C-Q boxes or all can be built from already known, namely C-C acting on pre-shared entangled particles. show large classes are non-genuine. In particular,...

The typical configuration for inductive write/magnetoresistive read heads used in hard disk applications involves a shared pole (shield) between the write transducer and transducer. forms leading of portion head. track width is primarily determined by trailing pole, however, geometry has an important influence on track-edge writing effects and, therefore, embedded servo system performance. This effect simulated trimmed comparison, conventional head geometries. merits each impact side discussed.

The design and performance of an X–Y stage for fast electron-beam inspection wafers x-ray masks is described. technique involves the comparison images that are acquired by raster scan acquisition long swath recorded while moves at constant velocity. Pairs serially must remain registered to about 0.05 μm net accuracy, requiring interferometer controlled motion with very low vibration. system requires high-vacuum compatible, nonmagnetic construction, provision electron light optical elements...

Transmission line based equations are developed to describe the operation of MR heads. An analytical solution for magnetic flux in films is derived linear operation. This transmission method used analyze design center shielded dual stripe, soft adjacent layer and barberpole Error propagation analysis manufacturing tolerance sensitivity these various Finally, a Monte Carlo simulation investigate expected distribution performance manufactured heads.< <ETX...

Advances in 3D simulations of magnetoresistive heads and media are combined to permit detailed analysis track-edge recording effects hard disk applications. Vector Preisach models for thin film were together with micro-magnetic dual stripe into a single simulation system. This has permitted prediction servo gain non-linearities used embedded drives. The determine the impact linewidth alignment tolerances on nonlinearity.

It is noted that increasing the user density in digital recording by use of linear equalization and sequence detection will provide new design opportunities constraints on media. The authors have evaluated five head/media designs to determine how media can benefit from systems operating at higher density. They conclude limits high are nonlinearities dibit amplitude increases jitter correlation. origins noise described knockdown recoil magnetization. Head/media must be designed avoid...

Here we introduce the concept of classical input - quantum output (C-Q) non-signalling boxes, a generalisation (C-C) boxes. We argue that studying such objects leads to better understanding relation between nonlocality and non-locality beyond mechanics. The main issue discussed in paper is whether there exist 'genuine' C-Q boxes or all can be built from already known, namely C-C acting on pre-shared entangled particles. show large classes are non-genuine. In particular, bi-partite with...

Transmission line based equations are developed to describe the operation of MR heads. An analytical solution for magnetic flux in films is derived linear operation. This transmission method used analyze design center shielded dual stripe, soft adjacent layer and barberpole Error propagation analysis manufacturing tolerance sensitivity these various Finally, a Monte Carlo simulation investigate expected distribution performance manufactured >