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.
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