There are available today many data storage devices that serve the diverse application requirements of the consumer, professional entertainment, and computer data processing industries. Storage technologies include semiconductors, several varieties of optical disk, optical tape, magnetic disk, and many varieties of magnetic tape. In some cases, devices are developed with specific characteristic...

Article history: NiAl+SiO2 thin films were Received 28 May 2007 Received in revised form 9 June 2008 Accepted 24 July 2008 Available online 29 July 2008

Various aspects of the structure of thin film longitudinal recording media are presented and discussed. In particular we discuss the role that the various layers of thin film media play in controlling the microstructure and magnetic properties of the magnetic layer. These include the grain size of the films, the texture of the films, the role of the intermediate layer and the role of chemical s...

The traditional magnetic storage mechanisms ~both analog and digital! apply an external field signal H(t) to a hysteretic magnetic material, and read the remanent magnetization M (t), which is ~roughly! proportional to H(t). We propose a new analog method of recovering the signal from the magnetic material, making use of the shape of the hysteresis loop M (H). The field H , ‘‘stored’’ in a regi...

Finite-element methods along with Monte Carlo simulations were used to design a magnetic storage device for ultracold neutrons (UCN) to measure their lifetime. A setup was determined which should make it possible to confine UCN with negligible losses and detect the protons emerging from β-decay with high efficiency: stacked superconducting solenoids create the magnetic storage field, an electro...

An increasing number of database applications require online access to massive amounts of data. Since large-scale storage systems implemented entirely on magnetic disk can be impractical or too costly for many applications, tape jukeboxes can provide an attractive solution. This paper shows how the performance of tape jukeboxes can be improved across a broad parameter space via a new scheduling...

Current magnetic-accretion models for classical T-Tauri stars rely on a strong, dipolar magnetic field of stellar origin to funnel the disk material onto the star, and assume a steady-state. In this paper, I critically examine the physical basis of these models in light of the observational evidence and our knowledge of magnetic fields in low-mass stars, and find it lacking. I also argue that m...

The purpose of this study was to determine the environmental stability and life expectancies of magnetic media used with certain high density, digital recording tape systems, specifically the IBM 3590 and both Quantum’s Digital Linear Tape (DLT) and Super DLT products. The goal of the study was to compare the tape stabilities and life expectancies of the corresponding tape media and tape storag...

We theoretically investigate an adjustable-radius magnetic storage ring for laser-cooled and Bose-condensed atoms. Additionally, we discuss a novel time-dependent variant of this and other ring traps. Time-orbiting ring traps provide a high optical access method for spin-flip loss prevention near a storage ring’s circular magnetic field zero. Our scalable storage ring will allow one to probe th...

2.1 Use of magnetic tape Magnetic recording was first introduced in 1898, with the invention of the magnetic recording device by Valdemar Poulsen, a Danish scientist working on audio recording. Later, magnetic recording technology expanded from sound recording to the fields of image and information recording, with the rapid advancement of television, computers, and similar technology.