Gap-mode-assisted light-induced switching of sub-wavelength magnetic domains

G. Scheunert, R. McCarron, R. Kullock, S. R. Cohen, K. Rechav, I. Kaplan-Ashiri, O. Bitton, B. Hecht, Dan Oron

Research output: Contribution to journalArticle

Abstract

Creating sub-micron hotspots for applications such as heat-assisted magnetic recording (HAMR) is a challenging task. The most common approach relies on a surface-plasmon resonator (SPR), whose design dictates the size of the hotspot to always be larger than its critical dimension. Here, we present an approach which circumvents known geometrical restrictions by resorting to electric field confinement via excitation of a gap-mode (GM) between a comparatively large Gold (Au) nano-sphere (radius of 100 nm) and the magnetic medium in a grazing-incidence configuration. Operating a λ=785 nm laser, sub-200 nm hot spots have been generated and successfully used for GM-assisted magnetic switching on commercial CoCrPt perpendicular magnetic recording media at laser powers and pulse durations comparable to SPR-based HAMR. Lumerical electric field modelling confirmed that operating in the near-infrared regime presents a suitable working point where most of the light's energy is deposited in the magnetic layer, rather than in the nano-particle. Further, modelling is used for predicting the limits of our method which, in theory, can yield sub-30 nm hotspots for Au nano-sphere radii of 25-50 nm for efficient heating of FePt recording media with a gap of 5 nm.

Original languageEnglish
Article number143102
JournalJournal of Applied Physics
Volume123
Issue number14
DOIs
Publication statusPublished - Apr 14 2018

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magnetic recording
magnetic domains
resonators
wavelengths
magnetic switching
heat
radii
electric fields
grazing incidence
lasers
constrictions
pulse duration
recording
gold
heating
configurations
excitation
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Scheunert, G., McCarron, R., Kullock, R., Cohen, S. R., Rechav, K., Kaplan-Ashiri, I., ... Oron, D. (2018). Gap-mode-assisted light-induced switching of sub-wavelength magnetic domains. Journal of Applied Physics, 123(14), [143102]. https://doi.org/10.1063/1.5016970

Gap-mode-assisted light-induced switching of sub-wavelength magnetic domains. / Scheunert, G.; McCarron, R.; Kullock, R.; Cohen, S. R.; Rechav, K.; Kaplan-Ashiri, I.; Bitton, O.; Hecht, B.; Oron, Dan.

In: Journal of Applied Physics, Vol. 123, No. 14, 143102, 14.04.2018.

Research output: Contribution to journalArticle

Scheunert, G, McCarron, R, Kullock, R, Cohen, SR, Rechav, K, Kaplan-Ashiri, I, Bitton, O, Hecht, B & Oron, D 2018, 'Gap-mode-assisted light-induced switching of sub-wavelength magnetic domains', Journal of Applied Physics, vol. 123, no. 14, 143102. https://doi.org/10.1063/1.5016970
Scheunert G, McCarron R, Kullock R, Cohen SR, Rechav K, Kaplan-Ashiri I et al. Gap-mode-assisted light-induced switching of sub-wavelength magnetic domains. Journal of Applied Physics. 2018 Apr 14;123(14). 143102. https://doi.org/10.1063/1.5016970
Scheunert, G. ; McCarron, R. ; Kullock, R. ; Cohen, S. R. ; Rechav, K. ; Kaplan-Ashiri, I. ; Bitton, O. ; Hecht, B. ; Oron, Dan. / Gap-mode-assisted light-induced switching of sub-wavelength magnetic domains. In: Journal of Applied Physics. 2018 ; Vol. 123, No. 14.
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