Quantification of magnetic force microscopy using a micronscale current ring

Linshu Kong, Stephen Y. Chou

Research output: Contribution to journalArticlepeer-review

64 Scopus citations


Metal rings with inner diameters of 1 and 5 μm, fabricated using electron-beam lithography, were used to calibrate magnetic force microscopy (MFM). A MFM tip's effective magnetic charge, q, and effective magnetic moment along the tip's long axis, mz, can be determined from the MFM signal of the ring at a different scan height and a different electric current in the ring. The magnetic moments in the directions transverse to the tip's long axis were estimated by a straight current wire. It was found that for a Si tip coated with 65 nm cobalt on one side, q is 2.8×10-6 emu/cm, mz is 3.8×10-9 emu, and mx and my are in the order of 10-13 emu, which are negligible compared with mz. Furthermore, the MFMs sensitivity to the second derivative of the magnetic field was determined from the minimum ring current for a measurable MFM signal to be 0.1 Oe/nm2.

Original languageEnglish (US)
Pages (from-to)2043-2045
Number of pages3
JournalApplied Physics Letters
Issue number15
StatePublished - Apr 14 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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