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

Abstract

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.

Authors:
ORCiD logo [1];  [2];  [3];  [2];  [2]; ORCiD logo [2];  [2];  [3];  [3];  [3];  [2]; ORCiD logo [3];  [3]
  1. Univ. of Grenoble (France); Univ. de Lorraine, Nancy (France)
  2. Univ. de Lorraine, Nancy (France)
  3. Univ. of Grenoble (France)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); French National Research Agency (ANR); National Research Foundation of Korea (NRF)
OSTI Identifier:
1638189
Grant/Contract Number:  
AC02-05CH11231; ANR15-CE24-0009; ANR-15-IDEX-04-LUE; ANR- 16- CE24-0018; 2015M3D1A1070465
Resource Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 18; Journal Issue: 11; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; magnetic properties; bubbles; energy; lattices; lasers

Citation Formats

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, and Boulle, Olivier. Creation of Magnetic Skyrmion Bubble Lattices by Ultrafast Laser in Ultrathin Films. United States: N. p., 2018. Web. https://doi.org/10.1021/acs.nanolett.8b03653.
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. Creation of Magnetic Skyrmion Bubble Lattices by Ultrafast Laser in Ultrathin Films. United States. https://doi.org/10.1021/acs.nanolett.8b03653
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, and Boulle, Olivier. Mon . "Creation of Magnetic Skyrmion Bubble Lattices by Ultrafast Laser in Ultrathin Films". United States. https://doi.org/10.1021/acs.nanolett.8b03653. https://www.osti.gov/servlets/purl/1638189.
@article{osti_1638189,
title = {Creation of Magnetic Skyrmion Bubble Lattices by Ultrafast Laser in Ultrathin Films},
author = {Je, Soong-Geun and Vallobra, Pierre and Srivastava, Titiksha and Rojas-Sánchez, Juan-Carlos and Pham, Thai Ha and Hehn, Michel and Malinowski, Gregory and Baraduc, Claire and Auffret, Stéphane and Gaudin, Gilles and Mangin, Stéphane and Béa, Hélène and Boulle, Olivier},
abstractNote = {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.},
doi = {10.1021/acs.nanolett.8b03653},
journal = {Nano Letters},
number = 11,
volume = 18,
place = {United States},
year = {2018},
month = {10}
}

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