Abstract

Ferromagnetic-film-coated carbon nanotube (CNT) probes were employed in a magneticforce microscope (MFM) observation. We succeeded in making a uniform ferromagneticfilm on the CNT probes by improving the coating process and selecting materials. Theperformance of the CoFe-coated CNT probe was evaluated in ultra-high-density perpendicularmagnetic storage media with densities from 600 to 1100 k flux changes per inch (FCI). Themagnetic domain structure of the magnetic storage media was clearly observed up to1100 kFCI. The ultimate lateral resolution of the newly developed MFM probes is down toabout 10 nm, which exceeds the bit length of a magnetic recording with a density ofTbit inch−2.

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