the Sixth IEEE Symposium on Mass Storage Systems held at Vail, Colorado, in June 1984. To owners of large collections of data at the symposium, the future looked bright indeed. There were descriptions of new highperformance optical digital data disk products,'-3 descriptions of new very high density magnetic tape4 and magnetic disk formats, and a discussion of the design decisions leading up to...

The SMES (Superconducting Magnetic Energy Storage) is one of the very few direct electric energy storage systems. Its energy density is limited by mechanical considerations to a rather low value on the order of ten kJ/kg, but its power density can be extremely high. This makes SMES particularly interesting for high-power and short-time applications (pulse power sources). A SMES releases its ene...

The hard-disk storage industry is at a critical time as the current technologies are incapable of achieving densities beyond 500 Gb/in, which will be reached in a few years. Many radically new storage architectures have been proposed, which along with advanced signal processing algorithms are expected to achieve much higher densities. In this dissertation, various signal processing algorithms a...

This letter presents an experimental study that shows that a 3(rd) physical dimension may be used to further increase information packing density in magnetic storage devices. We demonstrate the feasibility of at least quadrupling the magnetic states of magnetic-based data storage devices by recording and reading information from nanopillars with three magnetically-decoupled layers. Magneto-opti...

Diamond-like carbon films form a critical protective layer on magnetic hard disks and their reading heads. The ultimate limit to storage density is the super-paramagnetic limit, where the thermal energy is able to overcome the coercive energy of the magnetic bit. Perpendicular recording should allow storage densities up to ;1 Tbityinch . This requires the read head to approach 2 closer to the m...

has been verified experimentally when the charge moves inside a magnetic medium for which B is much larger than μ0H [9]. 3 It is sometimes preferable that the force law be given in term of the total magnetic field on the current, in which case it is generally best (in the author’s opinion) to use the Maxwell stress tensor [8]. In 1908 Einstein and Laub [10, 11, 12] argued that the force density...

Teruo Kohashi, Dr. Sc. Kumi Motai, Dr. Sc. OVERVIEW: Electron microscope technology developed by Hitachi is used for testing and analysis of a wide range of semiconductors and other hardware devices. Spin SEMs are able to observe the magnetic structure of a device at the nanometer scale and are already used for applications such as evaluating the shape of storage bits on magnetic media. Hitachi...

We report here the development of Pt and Pd-free perpendicular magnetic tunnel junctions (p-MTJ) for STT-MRAM applications. We start by studying a p-MTJ consisting of a bottom synthetic Co/Pt reference layer and a synthetic FeCoB/Ru/FeCoB storage layer covered with an MgO layer. We first investigate the evolution of RKKY coupling with Ru spacer thickness in such a storage layer. The coupling be...