Donata Passarello, Simone G. Altendorf, et al.
Nano Letters
A lithographically patterned magnetic medium is one of the proposed routes to magnetic recording at a density beyond that thought to be possible using conventional recording media due to thermal instability caused by superparamagnetism. Using a focused ion beam to pattern a granular Co70Cr18Pt12 film, we have fabricated sub-80-nm size islands that are single domain and with a narrowed switching field distribution and an enhanced thermal stability. Magnetic isolation of the islands is shown to be a result of vanishing of magnetic remanence and coercivity in the irradiated region and not a result of sputtering. Recording measurements using a quasi-static giant magnetoresistive head demonstrate the sensitivity to detect single 80-nm islands. The readback jitter from the patterned region is dramatically reduced compared to that measured for continuous media at the same linear density.
Donata Passarello, Simone G. Altendorf, et al.
Nano Letters
Donald S. Bethune, Charles T. Rettner
IEEE JQE
Ji Yeon Kim, Philip Liu, et al.
ACS AMI
Donald S. Bethune, Charles T. Rettner, et al.
IQEC 1984