A. Moser

Western Digital (United States)

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Co-Authors

Eric E. Fullerton

University of California, San Diego

D. T. Margulies

Hitachi Global Storage Technologies (United States)

Klaus‐Peter Wandinger

University Hospital Schleswig-Holstein

Robert Markewitz

University of Lübeck

Andreas Berger

CIC nanoGUNE

D. Weller

University of Duisburg-Essen

M.E. Best

University of Notre Dame

N. Supper

Hitachi (Japan)

Hans J. Hug

University of Basel

Hoa Do

La Trobe University

Cooperative Institutions

IBM (United States)

104

Hitachi Global Storage Technologies (United States)

IBM Research - Almaden

Western Digital (United States)

IBM Research - Zurich

University of Basel

Graz University of Technology

Hitachi (Japan)

Western Digital (Japan)

Montanuniversität Leoben

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Full-wafer technology-A new approach to large-scale laser fabrication and integration

IEEE Journal of Quantum Electronics (1991)

P. Vettiger Melvin K. Benedict G.L. Bona P. Buchmann E. C. Cahoon

A concept for full-wafer processing (FWP) and full-wafer testing (FWT) for semiconductor laser fabrication in the AlGaAs-GaAs material system is presented. The approach is based on chemically assisted ion beam etching for the laser-mirror formation. Record values for mirror scattering, optimum mirror reflectivity, and equivalence to cleaved mirrors in terms of laser threshold and efficiency have been achieved. Promising results for uniformity and reproducibility for major laser diode characteristics on processed 2-in wafers have been found. The FWP technology has been extensively used for designing test sites to determine various materials, process, and laser parameters, such as sheet resistance, ridge dimensions, lithographic alignment errors, mirror surface leakage, etc.< >

10.1109/3.89949

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Citations (54)

Magnetic dot arrays with multiple storage layers

Journal of Applied Physics (2005)

M. Albrecht G. Hu A. Moser Olav Hellwig B. D. Terris

An approach to increasing the data storage density of magnetic recording was investigated wherein dot arrays are combined with multiple magnetic storage layers. The latter consists of two magnetically decoupled perpendicular Co∕Pd multilayer stacks. As a result of the difference in the coercivity between the two stacks, the orientation of the remanent magnetization of each stack can be set independent of the orientation of the other layer. Therefore, each dot allows storing four different magnetization states, which give rise to four different readback signal levels. Thus, the investigated media structure allows doubling the storage density in magnetic recording applications. It was found that even for thick spacer layers a weak magnetostatic coupling of the storage layers is present preferring ferromagnetic alignment of the storage layers.

Magnetic storage

Patterned media

10.1063/1.1904705

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Citations (86)

Analysis of Written Transition Curvature in Perpendicular Magnetic Recording From Spin-Stand Testing

IEEE Transactions on Magnetics (2007)

Makoto Hashimoto M. Salo Y. Ikeda A. Moser Roger Wood

This paper presents a method of determining the transition curvature in magnetic recording, using only spin-stand measurements and a single read/write head. The method relies on finding an area of the disk in which the noise is in an as-deposited or bulk-erase state; the noise statistics can then be assumed to be independent of small changes in position across a track width. Trigger transitions are written on the disk and then the media noise is measured at many closely spaced positions across the track. From these multiple measurements, a 2-D picture of the noise referenced to the trigger can be created. This 2-D noise picture is distorted because of curvature of the trigger transitions. Assuming that the noise is truly stationary with respect to position, the underlying curvature of the trigger can thus be derived. On the basis of that derivation, any data pattern can be written and then read back and corrected for the known curvature on the trigger transitions. The paper compares the results obtained by this method with two different magnetic force microscope (MFM) observations. The new method shows, for example, that transitions written by a single-pole writer with a trailing shield writer have less transition curvature and transition noise than those written by a single-pole writer without any shield.

Position (finance)

Perpendicular recording

10.1109/tmag.2007.896205

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Citations (17)

Promising Biocompatible Monomers for Thiol-yne Based Photopolymers

Andreas Oesterreicher Johannes Wiener Meinhart Roth A. Moser Florian H. Mostegel

Biocompatible material

Thiol

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Citations (0)

Low temperature magnetic force microscopy

Review of Scientific Instruments (1993)

Hans J. Hug A. Moser Thomas A. Jung O. Fritz A. Wadas

We have built a low temperature scanning force microscope which is able to measure contact and noncontact forces using the dc modes of force microscopy. We demonstrate the capabilities of our instrument on a magneto-optical disk at room temperature and at 77 K. Using a ferromagnetic thin film tip, the topography and the micromagnetic stray field of the sample is measured using the dc modes of force microscopy. The topographic and magnetic data are precisely correlated. The circular bit structure and the natural domain structure between the homogeneously magnetized bits is clearly visible. A lateral resolution below 100 nm and a force resolution of 10−12 N is reproducibly achieved.

Electrostatic force microscope

Scanning Force Microscopy

Scanning Probe Microscopy

10.1063/1.1144383

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Citations (60)

Writing and detecting bits at 100 Gbit/in/sup 2/ in longitudinal magnetic recording media

IEEE Transactions on Magnetics (2000)

A. Moser Charles Rettner M.E. Best Eric E. Fullerton D. Weller

We have written bits in longitudinal media at extremely high areal densities, >100, using a focused ion beam (FIB) trimmed write head mounted on a static write/read tester. Bits were written at a track pitch of /spl sim/100 nm and with a 62.5 transition spacing with the same trimmed write head. The bits were characterized with the head read sensor and also with magnetic force microscopy (MFM). The MFM images were analyzed with respect to transition position jitter, signal-to-noise, and track width.

Patterned media

Recording head

SIGNAL (programming language)

Recording media

Gigabit

10.1109/20.908333

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Citations (30)

Arrhenius parameters for the rate process leading to catastrophic damage of AlGaAs-GaAs laser facets

Journal of Applied Physics (1992)

A. Moser E.E. Latta

The time dependence of catastrophic optical mirror damage (COMD) is investigated for cw operation of AlGaAs-GaAs quantum well lasers. The apparent Arrhenius parameters (i.e., the activation energy and pre-exponential factor) for the rate process leading to COMD are determined. In particular, we compare the rate process for various cleaved facets with and without a subsequent plasma oxidation step. Analysis of the experimental Arrhenius parameters indicates that surface reactions on the corroded facets are responsible for facet degradation accompanied by heating. A tentative model of the facet heating that ultimately leads to COMD is presented.

Facet (psychology)

Rate equation

Degradation

10.1063/1.350628

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Citations (73)

Photopolymerisierbare Monomere für den 3D Druck von biokompatiblen Strukturen

Andreas Oesterreicher Johannes Wiener Meinhart Roth A. Moser Florian H. Mostegel

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Citations (0)

A MILP-based modular energy management system for urban multi-energy systems: Performance and sensitivity analysis

Applied Energy (2019)

A. Moser Daniel Muschick Markus Gölles Peter Josef Nageler Hermann Schranzhofer

Energy management system

10.1016/j.apenergy.2019.114342

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Citations (64)

Observation of Single Vortices Condensed into a Vortex-Glass Phase by Magnetic Force Microscopy

Physical Review Letters (1995)

A. Moser Hans J. Hug I. Parashikov B. Stiefel O. Fritz

A low temperature magnetic force microscope has been applied to spatially resolve single vortices in an epitaxially grown YB${\mathrm{a}}_{2}$C${\mathrm{u}}_{3}$ ${\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ thin film at 77 K. A disordered vortex arrangement is observed, and the vortices are strongly pinned. The observed phase is expected to be truly superconducting due to strong pinning.

10.1103/physrevlett.74.1847

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Citations (163)