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December 22, 2011

Mtg: Test Method for Thermally-Assisted Magnetic Recording Applying Surface Plasmon Antennas Stacked on Granular Medium

by @ 9:00 am. Filed under ALL, Electronics Design, NanoEngineering, Optics/Displays, Semiconductors

MONDAY February 13, 2012
OEB Magnetics Chapter
Speaker: Prof. Yoshito Ashizawa, Nihon University
Time: 11:00 AM
Cost: none
Place: Lawrence Berkeley Natl Lab bldg 6-2202, Berkeley
RSVP: Please respond by email with name, company to Peter Fischer, by Feb 9

Thermally assisted magnetic recording is one of the promising technologies to increase memory density.? It is, however, not easy to test a surface plasmon antenna over magnetic recording media keeping a distance of a few nanometers without any damage to the antenna and the media.? We propose a new test method that places a plasmon antenna on the media to keep a distance and to avoid degrading the antenna or the media.? The antennas were fabricated on a magnetic medium.? A silicon nitride dielectric layer was placed between the antennas and the magnetic layer.? The thickness of the dielectric layer was chosen to be 3 nm, because the gap between the antenna and the magnetic layer should be 3 nm in a conventional setup.? A hundred of Au triangle shape antennas were formed by E-beam and lithographic techniques.? The length of the fabricated antennas ranges from 200 to 1000 nm.? Before trying this process, we had confirmed that the magnetic domains of a magnetic recording disk with the stacked Au antenna on the disk could be observed by a magnetic-force-microscope (MFM).? The Co55Pt30Cr15-SiO2 granular medium was fabricated by lamination method by the sputtering.? Under layers Ru(20nm)/Pt(6nm)/Ta(5nm) were fabricated on a glass substrate for the magnetic film.? The saturation field Hs, the coercivity Hc, and the nucleation field Hn of the magnetic film depending on temperature were plotted.
By using the laser spot which is about 1 ?m and 780 nm in wavelength, magnetic domains were written on the magnetic film by 10 mW with 10 ?s laser pulse duration without the plasmon antennas.? Under the exposing laser power condition that cannot record magnetic domains without the antenna, a written magnetic domain at the edge of the plasmon antenna is observed.? It is confirmed that we can test the plasmon and thermal effects of the plasmon antenna by directly placing the antenna on the magnetic granular medium.

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