期刊
ADVANCED MATERIALS
卷 30, 期 49, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201805461
关键词
Dzyaloshinkii-Moriya interaction; magnetic domains; multilayers; perpendicular magnetic anisotropy; skyrmions
类别
资金
- U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-SC0012371]
- DFG [SFB TRR173, SPP 2137]
- Graduate School of Excellence Materials Science in Mainz (MAINZ) [GSC 266]
- EU [ERC-2014-PoC 665672, FP7-PEOPLE-2013-ITN 608031]
- SpinNet, a topical network project of the German Academic Exchange Service (DAAD)
- Research Center of Innovative and Emerging Materials at Johannes Gutenberg University (CINEMA)
- German Academic Scholarship Foundation
- German Research Foundation [BU 3297/1-1]
- German Minister fur Bildung und Forschung (BMBF) [05KS4WE1/6, 05KS7WE1]
- NRF of Korea [2018K1A4A3A03075584, 2016M3D1A1027831, 2017R1A4A1015323]
- DGIST R&D program of the Ministry of Science, ICT and future Planning [18-BT-02]
- DOE-BES [DE-AC02-05CH11231]
- U.S. Department of Energy (DOE) [DE-SC0012371] Funding Source: U.S. Department of Energy (DOE)
Magnetic skyrmions promise breakthroughs in future memory and computing devices due to their inherent stability and small size. Their creation and current driven motion have been recently observed at room temperature, but the key mechanisms of their formation are not yet well-understood. Here it is shown that in heavy metal/ferromagnet heterostructures, pulsed currents can drive morphological transitions between labyrinth-like, stripe-like, and skyrmionic states. Using high-resolution X-ray microscopy, the spin texture evolution with temperature and magnetic field is imaged and it is demonstrated that with transient Joule heating, topological charges can be injected into the system, driving it across the stripe-skyrmion boundary. The observations are explained through atomistic spin dynamic and micromagnetic simulations that reveal a crossover to a global skyrmionic ground state above a threshold magnetic field, which is found to decrease with increasing temperature. It is demonstrated how by tuning the phase stability, one can reliably generate skyrmions by short current pulses and stabilize them at zero field, providing new means to create and manipulate spin textures in engineered chiral ferromagnets.
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