The University of Southampton
University of Southampton Institutional Repository

Frequency-based nanoparticle sensing over large field ranges using the ferromagnetic resonances of a magnetic nanodisc

Frequency-based nanoparticle sensing over large field ranges using the ferromagnetic resonances of a magnetic nanodisc
Frequency-based nanoparticle sensing over large field ranges using the ferromagnetic resonances of a magnetic nanodisc
Using finite element micromagnetic simulations, we study how resonant magnetisation dynamics in thin magnetic discs with perpendicular anisotropy are influenced by magnetostatic coupling to a magnetic nanoparticle. We identify resonant modes within the disc using direct magnetic eigenmode calculations and study how their frequencies and spatial profiles are changed by the nanoparticle's stray magnetic field. We demonstrate that particles can generate shifts in the resonant frequency of the disc's fundamental mode which exceed resonance linewidths in recently studied spin torque oscillator devices. Importantly, it is shown that the simulated shifts can be maintained over large field ranges (here up to 1 T). This is because the resonant dynamics (the basis of nanoparticle detection here) respond directly to the nanoparticle stray field, i.e. detection does not rely on nanoparticle-induced changes to the magnetic ground state of the disc. A consequence of this is that in the case of small disc-particle separations, sensitivities to the particle are highly mode- and particle-position-dependent, with frequency shifts being maximised when the intense stray field localised directly beneath the particle can act on a large proportion of the disc's spins that are undergoing high amplitude precession.
0957-4484
1-8
Albert, Maximilian
a8049610-1e98-4cfb-b59a-177645a42b47
Beg, Marijan
499a2633-2ab7-4ec3-ab2a-c6eae1874f83
Chernyshenko, Dmitri
62dad926-c42a-43db-9312-2cacbd53a042
Bisotti, Marc-Antonio
be2d7abd-afdc-4d18-a2e9-a633d73a67b9
Carey, Rebecca L.
fc5ef402-befe-4fff-ad14-c192eed54f36
Fangohr, Hans
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Metaxas, Peter J.
422e8ca8-6e4a-48cb-b7eb-1e11a73361e3
Albert, Maximilian
a8049610-1e98-4cfb-b59a-177645a42b47
Beg, Marijan
499a2633-2ab7-4ec3-ab2a-c6eae1874f83
Chernyshenko, Dmitri
62dad926-c42a-43db-9312-2cacbd53a042
Bisotti, Marc-Antonio
be2d7abd-afdc-4d18-a2e9-a633d73a67b9
Carey, Rebecca L.
fc5ef402-befe-4fff-ad14-c192eed54f36
Fangohr, Hans
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Metaxas, Peter J.
422e8ca8-6e4a-48cb-b7eb-1e11a73361e3

Albert, Maximilian, Beg, Marijan, Chernyshenko, Dmitri, Bisotti, Marc-Antonio, Carey, Rebecca L., Fangohr, Hans and Metaxas, Peter J. (2016) Frequency-based nanoparticle sensing over large field ranges using the ferromagnetic resonances of a magnetic nanodisc. Nanotechnology, 27 (45), 1-8. (doi:10.1088/0957-4484/27/45/455502).

Record type: Article

Abstract

Using finite element micromagnetic simulations, we study how resonant magnetisation dynamics in thin magnetic discs with perpendicular anisotropy are influenced by magnetostatic coupling to a magnetic nanoparticle. We identify resonant modes within the disc using direct magnetic eigenmode calculations and study how their frequencies and spatial profiles are changed by the nanoparticle's stray magnetic field. We demonstrate that particles can generate shifts in the resonant frequency of the disc's fundamental mode which exceed resonance linewidths in recently studied spin torque oscillator devices. Importantly, it is shown that the simulated shifts can be maintained over large field ranges (here up to 1 T). This is because the resonant dynamics (the basis of nanoparticle detection here) respond directly to the nanoparticle stray field, i.e. detection does not rely on nanoparticle-induced changes to the magnetic ground state of the disc. A consequence of this is that in the case of small disc-particle separations, sensitivities to the particle are highly mode- and particle-position-dependent, with frequency shifts being maximised when the intense stray field localised directly beneath the particle can act on a large proportion of the disc's spins that are undergoing high amplitude precession.

Text
1604.07277 v2 Fangohr.pdf - Accepted Manuscript
Download (2MB)

More information

Accepted/In Press date: 8 August 2016
e-pub ahead of print date: 6 October 2016
Published date: 6 October 2016
Organisations: Computational Engineering & Design Group

Identifiers

Local EPrints ID: 401704
URI: https://eprints.soton.ac.uk/id/eprint/401704
ISSN: 0957-4484
PURE UUID: 9b01be91-35f6-4cb6-bb2b-4696cc2d2103

Catalogue record

Date deposited: 19 Oct 2016 15:24
Last modified: 30 Nov 2018 05:02

Export record

Altmetrics

Contributors

Author: Maximilian Albert
Author: Marijan Beg
Author: Dmitri Chernyshenko
Author: Marc-Antonio Bisotti
Author: Rebecca L. Carey
Author: Hans Fangohr
Author: Peter J. Metaxas

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×