Sensing magnetic nanoparticles using nano-confined ferromagnetic resonances in a magnonic crystal

Peter Metaxas, Manu Sushruth, Ryan Begley, J. Ding, Rob Woodward, Ivan Maksymov, M. Albert, W. Wang, H. Fangohr, A.O. Adeyeye, Mikhail Kostylev

Research output: Contribution to journalArticle

33 Citations (Scopus)
531 Downloads (Pure)

Abstract

© 2015 AIP Publishing LLC. We experimentally demonstrate the use of the magnetic-field-dependence of highly spatially confined, GHz-frequency ferromagnetic resonances for the detection of magnetic nanoparticles using an anti-dot-based magnonic crystal. The stray magnetic fields of nanoparticles within the anti-dots modify nano-confined ferromagnetic resonances in the surrounding periodically nanopatterned magnonic crystal, generating easily measurable resonance peak shifts. The shifts are comparable to the resonance linewidths for high anti-dot filling fractions with their signs and magnitudes dependent upon the mode localization, consistent with micromagnetic simulation results. This is an encouraging result for the development of frequency-based nanoparticle detectors for nano-scale biosensing.
Original languageEnglish
Pages (from-to)232406-1 - 232406-5
JournalApplied Physics Letters
Volume106
Issue number23
DOIs
Publication statusPublished - 11 Jun 2015

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