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Creation of Magnetic Skyrmion Bubble Lattices by Ultrafast Laser in Ultrathin Films
Je, Soong-Geun,Vallobra, Pierre,Srivastava, Titiksha,Rojas-Sá,nchez, Juan-Carlos,Pham, Thai Ha,Hehn, Michel,Malinowski, Gregory,Baraduc, Claire,Auffret, Sté,phane,Gaudin, Gilles,Mangin, St American Chemical Society 2018 NANO LETTERS Vol.18 No.11
<P>Magnetic skyrmions are topologically nontrivial spin textures which hold great promise as stable information carriers in spintronic devices at the nanoscale. One of the major challenges for developing novel skyrmion-based memory and logic devices is fast and controlled creation of magnetic skyrmions at ambient conditions. Here we demonstrate controlled generation of skyrmion bubbles and skyrmion bubble lattices from a ferromagnetic state in sputtered ultrathin magnetic films at room temperature by a single ultrafast (35 fs) laser pulse. The skyrmion bubble density increases with the laser fluence, and it finally becomes saturated, forming disordered hexagonal lattices. Moreover, we present that the skyrmion bubble lattice configuration leads to enhanced topological stability as compared to isolated skyrmions, suggesting its promising use in data storage. Our findings shed light on the optical approach to the skyrmion bubble lattice in commonly accessible materials, paving the road toward the emerging skyrmion-based memory and synaptic devices.</P> [FIG OMISSION]</BR>
Spin-orbit torque-induced switching in ferrimagnetic alloys: Experiments and modeling
Je, Soong-Geun,Rojas-Sá,nchez, Juan-Carlos,Pham, Thai Ha,Vallobra, Pierre,Malinowski, Gregory,Lacour, Daniel,Fache, Thibaud,Cyrille, Marie-Claire,Kim, Dae-Yun,Choe, Sug-Bong,Belmeguenai, Mohamed American Institute of Physics 2018 Applied Physics Letters Vol.112 No.6