Study of magnetic properties of magnetic force microscopy probes using micronscale current rings

Linshu Kong, Stephen Y. Chou

Research output: Contribution to journalArticle

31 Scopus citations

Abstract

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 long axis, mz, can be determined by the current flowing 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 silicon tip coated with 65 nm thick cobalt on the side, q = 2.8 × 10-6 emu/cm, mz = 3.8 × 10-9 emu, and mx = my = 10-13 emu, which are negligible compared with mz. Furthermore, the tip's sensitivity to the second derivative of the magnetic field was found to be about 0.1 Oe/nm2.

Original languageEnglish (US)
Pages (from-to)5026-5028
Number of pages3
JournalJournal of Applied Physics
Volume81
Issue number8 PART 2B
DOIs
StatePublished - Apr 15 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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