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Resonance-based detection of magnetic nanoparticles and microbeads using nanopatterned ferromagnets
Citation
Sushruth, M and Ding, J and Duczynski, J and Woodward, RC and Begley, RA and Fangohr, H and Fuller, RO and Adeyeye, AO and Kostylev, M and Metaxas, PJ, Resonance-based detection of magnetic nanoparticles and microbeads using nanopatterned ferromagnets, Physical Review Applied, 6, (4) Article 044005. ISSN 2331-7019 (2016) [Refereed Article]
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Copyright Statement
© 2016 American Physical Society
DOI: doi:10.1103/PhysRevApplied.6.044005
Abstract
Biosensing with ferromagnet-based magnetoresistive devices has been dominated by electrical detection
of particle-induced changes to a device’s (quasi-)static magnetic configuration. There are however potential
advantages to be gained from using field dependent, high frequency resonant magnetization dynamics for
magnetic particle detection. Here, we demonstrate the use of nanoconfined ferromagnetic resonances in
periodically nanopatterned magnetic films for the detection of adsorbed magnetic particles having
diameters ranging from 6 nm to 4 μm. The nanopatterned films contain arrays of holes which appear to act
as preferential adsorption sites for small particles. Hole-localized particles act in unison to shift the
frequencies of the patterned layer’s ferromagnetic-resonance modes, with shift polarities determined by the
localization of each mode within the nanopattern’s repeating unit cell. The same polarity shifts are observed
for a large range of coverages, even when quasicontinuous particle sheets form above the hole-localized
particles. For large particles, preferential adsorption no longer occurs, leading to resonance shifts with
polarities that are independent of the mode localization, and amplitudes that are comparable to those seen in
continuous layers. Indeed, for nanoparticles adsorbed onto a continuous layer, the particle-induced shift of
the layer’s fundamental mode is up to 10 times less than that observed for nanoconfined modes in the
nanopatterned systems, the low shift being induced by relatively weak fields emanating beyond the particle
in the direction of the static applied field. This result highlights the importance of having particles
consistently positioned in the close vicinity of confined modes.
Item Details
Item Type: | Refereed Article |
---|---|
Research Division: | Chemical Sciences |
Research Group: | Inorganic chemistry |
Research Field: | Metal organic frameworks |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the chemical sciences |
UTAS Author: | Fuller, RO (Dr Rebecca Fuller) |
ID Code: | 135603 |
Year Published: | 2016 |
Web of Science® Times Cited: | 14 |
Deposited By: | Chemistry |
Deposited On: | 2019-11-05 |
Last Modified: | 2022-08-23 |
Downloads: | 22 View Download Statistics |
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