Creation of Magnetic Skyrmion Bubble Lattices by Ultrafast Laser in Ultrathin Films

Je, Soong-Geun; Vallobra, Pierre; Srivastava, Titiksha; Rojas-Sánchez, Juan-Carlos; Pham, Thai Ha; Hehn, Michel; Malinowski, Gregory; Baraduc, Claire; Auffret, Stéphane; Gaudin, Gilles; Mangin, Stéphane; Béa, Hélène; Boulle, Olivier

doi:10.1021/acs.nanolett.8b03653

Title: Creation of Magnetic Skyrmion Bubble Lattices by Ultrafast Laser in Ultrathin Films

Journal Article · 07 October 2018 · Nano Letters

DOI: https://doi.org/10.1021/acs.nanolett.8b03653 · OSTI ID:1638189

^[1]; Vallobra, Pierre ^[2]; Srivastava, Titiksha ^[3]; Rojas-Sánchez, Juan-Carlos ^[2]; Pham, Thai Ha ^[2];

^[2]; Malinowski, Gregory ^[2]; Baraduc, Claire ^[3]; Auffret, Stéphane ^[3]; Gaudin, Gilles ^[3]; Mangin, Stéphane ^[2];

^[3]; Boulle, Olivier ^[3]

Univ. of Grenoble (France); Univ. de Lorraine, Nancy (France)
Univ. de Lorraine, Nancy (France)
Univ. of Grenoble (France)

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: French National Research Agency (ANR); National Research Foundation of Korea (NRF); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1638189

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 11 Vol. 18; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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