Low power continuous-wave all-optical magnetic switching in ferromagnetic nanoarrays

Kilian D. Stenning; Xiaofei Xiao; Holly H. Holder; Jack C Gartside; Alex Vanstone; Oskar W Kennedy; Rupert F. Oulton; Will R. Branford

doi:10.1117/12.2633356

3 October 2022 Low power continuous-wave all-optical magnetic switching in ferromagnetic nanoarrays

Kilian D. Stenning, Xiaofei Xiao, Holly H. Holder, Jack C Gartside, Alex Vanstone, Oskar W Kennedy, Rupert F. Oulton, Will R. Branford

Author Affiliations +

Proceedings Volume PC12196, Active Photonic Platforms 2022; PC121961F (2022) https://doi.org/10.1117/12.2633356
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States

Abstract

All-optical magnetic switching represents a next-generation class of local magnetisation control, with wide-ranging technological implications. Existing all-optical switching schemes are unsuitable for device integration, typically requiring femtosecond-pulsed lasers and complex magnetic materials. Here, we demonstrate deterministic, all-optical magnetic switching using a low-power, linearly-polarised continuous-wave laser in nanoparticles with sub-diffraction limit dimensions composed permalloy. The poor absorption in permalloy nanoparticles is mitigated with an interference method to enable high fidelity magnetic writing at powers <3 mW. Isolated and densely-packed nanomagnets are switched. The results point to low-cost, low-power optically-controlled magnetic devices with impact across data storage, neuromorphic computation and reconfigurable magnonics.

Conference Presentation

Citation Download Citation

Kilian D. Stenning, Xiaofei Xiao, Holly H. Holder, Jack C Gartside, Alex Vanstone, Oskar W Kennedy, Rupert F. Oulton, and Will R. Branford "Low power continuous-wave all-optical magnetic switching in ferromagnetic nanoarrays", Proc. SPIE PC12196, Active Photonic Platforms 2022, PC121961F (3 October 2022); https://doi.org/10.1117/12.2633356

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