Fabrication, writing, and reading of 10 Gbits/in(2) longitudinal quantizedmagnetic disks with a switching field over 1000 Oe

Quantized magnetic disks (QMDs) with a density of 10 Gbits/in(2) were fabri cated using nanoimprint lithography and a lift-off process. Each bit in the QMD consists of a patterned single domain Co bar with a length of 200 nm, a width of 60 nm, and a bar spacing of 130 nm. Magnetic force microscope (M FM) was used to write and read the QMD. In 2.5 mu m x 2.5/mu m MFM window, error-free MFM writing has been achieved, even though there is no feedback control of the writing tip position and the Co bars switching field was as high as 1020 Oe.