期刊
NPG ASIA MATERIALS
卷 12, 期 1, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41427-020-00270-z
关键词
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资金
- KIST Institutional Program [2E30600, 2V06290]
- National Research Council of Science and Technology (NST) by the Ministry of Science and ICT (MSIT) [CAP-16-01-KIST]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2019R1A6A3A01091209]
- NRF - MSIT [NRF-2020R1A5A1104591, NRF-2018R1D1A1B07047114]
- Basic Science Research Program through the NRF - MSIT [NRF-2017R1A2B4012482, 2016K1A4A01922028, NRF-2017R1A2B2012514]
- POSCO Green Science program
- National Research Council of Science & Technology (NST), Republic of Korea [CAP-16-01-KIST] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The discovery of a thermally stable, high-density magnetic skyrmion phase is a key prerequisite for realizing practical skyrmionic memory devices. In contrast to the typical low-density Neel-type skyrmions observed in technologically viable multilayer systems, with Lorentz transmission electron microscopy, we report the discovery of a high-density homochiral Neel-type skyrmion phase in magnetic multilayer structures that is stable at high temperatures up to 733 K (approximate to 460 degrees C). Micromagnetic simulations reveal that a high-density skyrmion phase can be stabilized at high temperature by deliberately tuning the magnetic anisotropy, magnetic field, and temperature. The existence of the high-density skyrmion phase in a magnetic multilayer system raises the possibility of incorporating chiral Neel-type skyrmions in ultrahigh-density spin memory devices. Moreover, the existence of this phase at high temperature shows its thermal stability, demonstrating the potential for skyrmion devices operating in thermally challenging modern electronic chips.
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