J R Kirtley et al 2007 Nanotechnology 18 465506 doi:10.1088/0957-4484/18/46/465506
Moment switching in nanotube magnetic force probes
J R Kirtley1,2,3, Z Deng4, L Luan4, E Yenilmez1, H Dai5 and K A Moler1,4
Show affiliationsMagnetic images of high density vertically recorded media using metal-coated carbon nanotube tips exhibit a doubling of the spatial frequency under some conditions (Deng et al 2004 Appl. Phys. Lett. 85 6263). Here we demonstrate that this spatial frequency doubling is due to the switching of the moment direction of the nanotube tip. This results in a signal which is proportional to the absolute value of the signal normally observed in MFM. Our modeling indicates that a significant fraction of the tip volume is involved in the observed switching, and that it should be possible to image high bit densities with nanotube magnetic force sensors.
- PACS
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07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
- Subjects
- Dates
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Issue 46 (21 November 2007)
Received 30 March 2007, in final form 29 August 2007
Published 12 October 2007
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Moment switching in nanotube magnetic force probes
J R Kirtley et al 2007 Nanotechnology 18 465506
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