Probing the local magnetization reversal through magnetoresistance measurement

I. C. Lo, J. C. Wu, Lance Horng, Zung Hang Wei, Mei Fang Lai, C. R. Chang

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Abstract

A microstructured permalloy ellipse with six equally spaced nonmagnetic voltage leads has been studied through magnetoresistance measurements and magnetic force microscopy. The aspect ratio and film thickness of the element having three vortices of magnetic configuration were accordingly designed and fabricated using electron-beam lithography through a lift off process. Magnetoresistance curves measured with various pairs of voltage leads have revealed a local magnetic-moment reversal. Two magnetoresistance kinks observed with decreasingincreasing field strength can be attributed to the vortex formationannihilation, which was confirmed by magnetic force microscopy and micromagnetic simulation. The motion of the vortex core driven by the transverse external magnetic field was estimated to be 4.1 nmOe.

Original languageEnglish
Article number10M102
JournalJournal of Applied Physics
Volume97
Issue number10
DOIs
Publication statusPublished - 2005 May 15

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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