Activation volumes in CoPtCr-SiO/sub 2/ perpendicular recording media

Recording performances in perpendicular magnetic patterned media

We report on the recording performances and signal-to-noise ratio analyses of perpendicular magnetic bit-patterned media. Two different types of magnetic samples are investigated. They differ by the way that they were patterned (nano-imprint versus e-beam lithography) as well as their magnetic properties (Co/Pt multilayers and CoCrPt alloy are the recording layers). By using a contact read/writ...

Magnetic Layers for Perpendicular Recording Media

Hard disk drives (HDDs) are recently being incorporated into video recorders, car navigation devices, family game machines, etc., as devices (AV-HDDs) to store digital AV (audio-visual) information such as movies and television programs. Because the AV-HDD has the features of large capacity, high speed and low cost, it is suitable for long-time recording, high-speed random access and multi-chan...

Unexpected Universality in Disordered Systems and Modeling Perpendicular Recording Media

In this thesis, I study the random-field Ising model (RFIM) in both theoretical and applied perspectives. For theoretical interests, I compare the avalanche behavior in equilibrium and non-equilibrium and find an unexpected universality. The application part focuses on the reliability test of the ∆H(M,∆M) methodology, which has been used to measure microscopic properties of magnetic recording m...

Magnetic structures in Co-Cr media for perpendicular magnetic recording

High bit densities have been demonstrated in longitudinal as well as in perpendicular magnetic recording. For the latter an area density of more than 12 G b i t / i n 2 has been obtained in a sputtered C o C r T a hard disk with a soft magnetic underlayer recorded with a special single pole head. In this paper the role of microstructure and morphology in relation to the compositional separation...

Magnetic interactions in CoCrPt-oxide based perpendicular magnetic recording media