Room-Temperature Skyrmions at Zero Field in Exchange-Biased Ultrathin Films

被引:39
作者
Rana, K. Gaurav [1 ]
Finco, A. [2 ,3 ]
Fabre, F. [2 ,3 ]
Chouaieb, S. [2 ,3 ]
Haykal, A. [2 ,3 ]
Buda-Prejbeanu, L. D. [1 ]
Fruchart, O. [1 ]
Le Denmat, S. [4 ]
David, P. [4 ]
Belmeguenai, M. [5 ]
Denneulin, T. [6 ,7 ]
Dunin-Borkowski, R. E. [6 ,7 ]
Gaudin, G. [1 ]
Jacques, V [2 ,3 ]
Boulle, O. [1 ]
机构
[1] Univ Grenoble Alpes, Spintec, Grenoble INP, CEA,CNRS, Grenoble, France
[2] Univ Montpellier, Lab Charles Coulomb, F-34095 Montpellier, France
[3] CNRS, F-34095 Montpellier, France
[4] Univ Grenoble Alpes, Inst Neel, CNRS, F-38000 Grenoble, France
[5] Univ Sorbonne Paris Nord, LSPM, CNRS, UPR 3407, F-93430 Villetaneuse, France
[6] Forschungszentrum Julich, Ernst Ruska Ctr Microscopy & Spect Electron, D-52425 Julich, Germany
[7] Forschungszentrum Julich, Peter Grunberg Inst, D-52425 Julich, Germany
来源
PHYSICAL REVIEW APPLIED | 2020年 / 13卷 / 04期
基金
欧洲研究理事会; 欧盟地平线“2020”;
关键词
MAGNETIC SKYRMIONS; LATTICE;
D O I
10.1103/PhysRevApplied.13.044079
中图分类号
O59 [应用物理学];
学科分类号
摘要
We demonstrate that magnetic skyrmions with a mean diameter around 60 nm can be stabilized at room temperature and zero external magnetic field in an exchange-biased Pt/Co/Ni80Fe20/Ir20Mn80 multilayer stack. This is achieved through an advanced optimization of the multilayer-stack composition in order to balance the different magnetic energies controlling the skyrmion size and stability. Magnetic imaging is performed both with magnetic force microscopy and scanning nitrogen-vacancy magnetometry, the latter providing unambiguous measurements at zero external magnetic field. In such samples, we show that exchange bias provides an immunity of the skyrmion spin texture to moderate external-magnetic-field perturbations, in the tens-of-millitesla range, which is an important feature for applications such as memory devices. These results establish exchange-biased multilayer stacks as a promising platform toward the effective realization of memory and logic devices based on magnetic skyrmions.
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页数:8
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