Mapping local susceptibility using a scanning coaxial write/read head
1998 (English)In: Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films, ISSN 0734-2101, E-ISSN 1520-8559, Vol. 16, no 4, 2687-2692 p.Article in journal (Refereed) Published
A technique to study local susceptibility of magnetic material is introduced. We describe a unique probe based on a pair of write/read heads, to measure and model both the susceptibility components at any point on a surface. With this approach it is possible to map the strength and direction of the local in-plane uniaxial susceptibility at surfaces. The usefulness of our technique is validated by measurements on oriented gamma-Fe2O3 in a credit card. In addition, we present studies on an amorphous soft ferromagnet containing different defect structures to reveal the micromagnetic structural details around defects on a surface. Our approach has the distinct advantage of determining the local susceptibility and anisotropy on a length scale not possible by using other techniques available today.
Place, publisher, year, edition, pages
1998. Vol. 16, no 4, 2687-2692 p.
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:kth:diva-24095ISI: 000074852700105OAI: oai:DiVA.org:kth-24095DiVA: diva2:343381
QC 201008132010-08-132010-08-132010-08-13Bibliographically approved