Quantitative magneto-mechanical detection and control of the Barkhausen effect

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DOIResolve DOI: http://doi.org/10.1126/science.1231390
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TypeArticle
Journal titleScience
ISSN0036-8075
Volume339
Issue6123
Pages10511054; # of pages: 4
Subjectferromagnetic material; magnetic nanoparticle; magnetic method; mechanical theory; quantitative analysis; quantum mechanics; torsion; Barkhausen effect; energy transfer; film; ion therapy; magnetism; magnetometry
AbstractQuantitative characterization of intrinsic and artificial defects in ferromagnetic structures is critical to future magnetic storage based on vortices or domain walls moving through nanostructured devices. Using torsional magnetometry, we observe finite size modifications to the Barkhausen effect in the limiting case of a single vortex core interacting with individual pointlike pinning sites in a magnetic thin film. The Barkhausen effect in this limit becomes a quantitative two-dimensional nanoscale probe of local energetics in the film. Tailoring the pinning potential using single-point focused ion beam implantation demonstrates control of the effect and points the way to integrated magneto-mechanical devices incorporating quantum pinning effects.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Security and Disruptive Technologies
Peer reviewedYes
NPARC number21271868
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Record identifier3805292c-cd81-4f77-bed3-f35492c8b712
Record created2014-04-24
Record modified2016-05-09
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