Magnetic skyrmions in confined geometries: Effect of the magnetic field and the disorder

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:455

Article

Juge, Romeo¹  Je, Soong-Geun¹  Chaves, Dayane de Souza²  Pizzini, Stefania²  Buda-Prejbeanu, Liliana D.¹  Aballe, Lucia³  Foerster, Michael³  Locatelli, Andrea⁴  Mentes, Tevfik Onur⁴  Sala, Alessandro⁴  Maccherozzi, Francesco⁵  Dhesi, Sarnjeet S.⁵  Auffret, Stephane¹  Gautier, Eric¹  Gaudin, Gilles¹  Vogel, Jan²  Boulle, Olivier¹ 

[1] Univ Grenoble Alpes, CNRS, CEA, Spintec,Grenoble INP,INAC Spintec, F-38000 Grenoble, France

[2] Univ Grenoble Alpes, CNRS, Inst Neel, 25 Ave Martyrs,BP 166, F-38042 Grenoble 9, France

[3] ALBA Synchrotron Light Facil, Carrer Llum 2-26, Cerdanyola Del Valles 08290, Barcelona, Spain

[4] Elettra Sincrotrone SCpA, SS 14 Km 163-5 AREA Sci Pk, I-34149 Trieste, Italy

[5] Diamond Light Source, Didcot OX11 0DE, Oxon, England

关键词: Magnetic skyrmion;    XMCD;    Disorder;    Grain distribution;   

DOI  :  10.1016/j.jmmm.2017.10.030

来源: Elsevier

【 摘 要 】

We report on the effect of the lateral confinement and a perpendicular magnetic field on isolated room-temperature magnetic skyrmions in sputtered Pt/Co/MgO nanotracks and nanodots. We show that the skyrmions size can be easily tuned by playing on the lateral dimensions of the nanostructures and by using external magnetic field amplitudes of a few mT, which allow to reach sub-100 nm diameters. Our XMCD-PEEM observations also highlight the important role of the pinning on the skyrmions size and stability under an out-of-plane magnetic field. Micromagnetic simulations reveal that the effect of local pinning can be well accounted for by considering the thin film grain structure with local anisotropy variations and reproduce well the dependence of the skyrmion diameter on the magnetic field and the geometry. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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