Gap-mode-assisted light-induced switching of sub-wavelength magnetic domains
| Autor: | Katya Rechav, Ifat Kaplan-Ashiri, Ora Bitton, Ryan McCarron, René Kullock, Sidney R. Cohen, Bert Hecht, G. Scheunert, Dan Oron |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Magnetic domain business.industry General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology Laser 01 natural sciences law.invention Resonator law Electric field 0103 physical sciences Hotspot (geology) Perpendicular Optoelectronics 0210 nano-technology business Critical dimension Excitation |
| Zdroj: | Journal of Applied Physics. 123:143102 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.5016970 |
| Popis: | 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 ... |
| Databáze: | OpenAIRE |
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