The recently discovered iron-based superconductors are potential candidates for high-field magnet applications. However, the critical current densities (J(c)) of iron-based superconducting wires remain far below the level needed for practical applications. Here, we show that the transport Jc of Ba₁-xKxFe₂As₂/Ag tapes is significantly enhanced by the combination process of cold flat rolling and ...

In this work, stacked model conductors consisting of dozens YBCO tapes were fabricated and experimentally investigated to determine whether the hysteresis coupling losses affect each other. When an oblique magnetic field is applied tape, are expected be generated simultaneously. A uniform AC transverse was sample in liquid nitrogen, measured via pickup coil method. The measurements carried with...

In this paper, we consider a storage server architecture for multimedia information systems. While most other works on multimedia storage servers assume on-line disk storage [12, 11, 15, 8, 2], we consider a two-tier storage architecture with a robotic tape library as the vast near-line storage and on-line disks as the front-line storage. Magnetic tapes are cheaper, more robust, and have a larg...

Lateral tape displacement in a tape drive is believed to be one of the critical limiting factors in achieving high track density in tape storage media. For improving track density, servo control systems can be designed on the basis of information from a position error signal to improve the track following capabilities in a tape drive. In this paper, we consider the characterization of lateral t...

As capacity demands for magnetic tape storage systems grow, servo actuator design for tracking data on high density tape media presents new modeling and control design challenges. In this paper a frequency weighted subspace identification algorithm is presented for control relevant model estimation of a tape servo actuator. Common to other subspace identification methods, the proposed algorithm...