Continuous/Cluster-Pinned Recording Media

We propose and theoretically investigate a new class of nanostructured magnetic recording films, cluster-pinned recording media. The films consist of magnetic clusters exchange coupled to a continuous hard layer with perpendicular anisotropy and low coercivity. Our calculations yield the coercivity and the cross-track correlation length as a function of film thickness and pinning density and strength. The mechanism is very similar to the Gaunt–Friedel pinning in bulk magnets, which differs from ordinary strong pinning by the selfconsistent dependence of wall curvature and coercivity on defect concentration. The main difference is the exponent for the coercivity as a function of the pinning strength, which is equal to 2 in the bulk but equal to 3/2 in thin films. The pinning strength is estimated for various regimes, and it is shown that the diminished domain-wall curvature reduces jitter.

Nebraska Agri-Business Association

When I was with you back in August of 2001, I mentioned that in New Mexico I served on the board of the New Mexico Agricultural-Chemical and Plant Food Association, and have, I hope, some appreciation of the work you do. I also truly appreciate your interest in your support of the work conducted at the Institute of Agriculture and Natural Resources at the University of Nebraska-Lincoln. Thank you for that! Your support, always critical, becomes even more so in such difficult, difficult economic times as our state finds itself in today. Nearly $4 million dollars was permanently slashed from the IANR budget in three rounds of budget cuts between October 2001 and August 2002, a result of Nebraska's continuing revenue shortfalls. At the same time, our frustrated IANR constituents make it clear that nearly $4 million of need did not disappear with our funding. Now more cuts are expected in this legislative session.