Stenning, KD;
Xiao, X;
Holder, HH;
Gartside, JC;
Vanstone, A;
Kennedy, OW;
Oulton, RF;
(2023)
Low-power continuous-wave all-optical magnetic switching in ferromagnetic nanoarrays.
Cell Reports Physical Science
, 4
(3)
, Article 101291. 10.1016/j.xcrp.2023.101291.
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Abstract
All-optical magnetic switching promises ultrafast magnetization control without a magnetic field. Existing schemes typically require power-hungry femtosecond-pulsed lasers and complex magnetic materials. Here, we demonstrate deterministic, all-optical magnetic switching in simple ferromagnetic nanomagnets (Ni81Fe19, Ni50Fe50) with sub-diffraction limit dimensions using a focused low-power, linearly polarized continuous-wave laser. Isolated nanomagnets are switched across a range of dimensions, laser wavelengths, and powers. All square-geometry artificial spin ice vertex configurations are written at low powers (2.74 mW). Usually, switching with linearly polarized light is symmetry forbidden; here, the laser spot has a similar size to the nanomagnets, producing an absorption distribution that depends on the nanoisland-spot displacement. We attribute the deterministic switching to the transient dynamics of this asymmetric absorption. No switching is observed in Co or Ni nanostructures, suggesting the multi-species nature of NiFe plays a role. These results usher in inexpensive, low-power, optically controlled devices with impact across data storage, neuromorphic computation, and reconfigurable magnonics.
| Type: | Article |
|---|---|
| Title: | Low-power continuous-wave all-optical magnetic switching in ferromagnetic nanoarrays |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.xcrp.2023.101291 |
| Publisher version: | https://doi.org/10.1016/j.xcrp.2023.101291 |
| Language: | English |
| Additional information: | © 2023 The Author(s). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
| Keywords: | nanomagnetism, all-optical magnetic switching, low-power data storage, metamaterial, artificial spin ice, magnetic light absorption, single-nanomagnet control, optical absorption enhancement, field-free magnetic switching, optically induced spin transfer (OISTR) |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10167969 |
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