The use of MFM for investigating domain structures in modern permanent magnet materials

L. Folks, Rob Woodward

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

Magnetic force microscopy occupies a special niche in the array of techniques which are currently available for imaging magnetic structures of high energy permanent magnet materials, yielding high resolution data under ambient conditions on bulk samples. The high anisotropies of permanent magnet samples mean that to a good approximation the tip stray held does not modify the magnetic state of the sample. However strong stray fields, of the order of 1 Tesla, may be experienced by a tip in close proximity to the sample. These stray fields are known to perturb the magnetic state of the tip considerably. As a result, contrast may be generated between neighboring domains, or at domain boundary walls or a combination of both, depending on the degree of perturbation of the tip. Examples demonstrating this variation with a series of batch-fabricated tips with various magnetic coatings ranging in coercivity from similar to 1400 Oe to
Original languageEnglish
Pages (from-to)28-41
JournalJournal of Magnetism and Magnetic Materials
Volume190
Issue numberN/A
DOIs
Publication statusPublished - 1998

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