期刊
APPLIED PHYSICS LETTERS
卷 112, 期 6, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.5009726
关键词
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资金
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning of Korea (MSIP) [2015R1A2A1A05001698, 2015M3D1A1070465]
- National Research Council of Science and Technology (NST) by the Korean government (MSIP) [CAP-16-01-KIST]
- Japan Society for the Promotion of Science [P16314]
In this study, we investigate the influence of the ferromagnetic layer thickness on the magnetization process. A series of ultrathin Pt/Co/TiO2/Pt films exhibits domain-wall (DW) speed variation of over 100,000 times even under the same magnetic field, depending on the ferromagnetic layer thickness. From the creep-scaling analysis, such significant variation is found to be mainly attributable to the thickness-dependence of the creep-scaling constant in accordance with the creep-scaling theory of the linear proportionality between the creep-scaling constant and the ferromagnetic layer thickness. Therefore, a thinner film shows a faster DW speed. The DW roughness also exhibits sensitive dependence on the ferromagnetic layer thickness: a thinner film shows smoother DW. The present observation provided a guide for an optimal design rule of the ferromagnetic layer thickness for better performance of DW-based devices. Published by AIP Publishing.
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