Writing and reading 7.5 gbits/in2 longitudinal quantized magnetic disk using magnetic force microscope tips

Linshu Kong, Lei Zhuang, Stephen Y. Chou

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


Quantized magnetic disks (QMDs) consisting of longitudinal single-domain Ni bars with densities from 3 Gbits/in2 to 10 Gbits/in2 were fabricated using nanoimprint lithography and a lift-off process. Two different types of MFM tips were used in the writing and reading process, one for erasing and writing, another for reading; both were magnetically 'hard'. The QMDs were first erased by aligning all bars with the write-tip scanning the entire sample, then written using lithography software in NanoScope III. Error-free results were obtained up to 7.5 Gbits/in2 despite the poorly-defined magnetic field from the write-tip and despite not having a feedback control for the write-tip position.

Original languageEnglish (US)
Pages (from-to)3019-3021
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number5 PART 1
StatePublished - 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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