R&D: Size Effect on Single Pulse All-Optical Helicity-Independent Switching in GdFeCo Disk Arrays
Report that fluence required to observe both magnetic states show non-monotonic behavior with disk diameter and that smallest disks require lowest minimum fluence for achieving single pulse all-optical helicity-independent switching
This is a Press Release edited by StorageNewsletter.com on January 9, 2024 at 2:00 pmApplied Physics Letters has published an article written by Danny Petty Gweha Nyoma, Maxime Vergès, Michel Hehn, Daniel Lacour, Julius Hohlfeld, Université de Lorraine, CNRS, IJL, F-54000 Nancy, France, Sebastiaan van Dijken, NanoSpin, Department of Applied Physics, Aalto University School of Science, FI-00076 Aalto, Finland, Grégory Malinowski, Stéphane Mangin , and François Montaigne, Université de Lorraine, CNRS, IJL, F-54000 Nancy, France.
Abstract: “We experimentally demonstrate single pulse toggle switching of the magnetization of GdFeCo disks with perpendicular to film plane anisotropy, which diameter ranges from 3 μm to 400 nm using 35 fs linearly polarized laser pulses. Two different magnetic states can be observed depending on the laser fluence: either a deterministic switching of the disk magnetization or a randomly oriented disk. We report that the fluence required to observe both magnetic states show a non-monotonic behavior with disk diameter and that the smallest disks require the lowest minimum fluence for achieving single pulse all-optical helicity-independent switching. Different evolution of the fluence thresholds for both phenomenon as a function of the disk size is observed and discussed.“
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