Huge domain-wall speed variation with respect to ferromagnetic layer thickness in ferromagnetic Pt/Co/TiO2/Pt films
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- Dae-Yun Kim
- Department of Physics and Astronomy, Seoul National University 1 , Seoul, South Korea
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- Min-Ho Park
- Department of Physics and Astronomy, Seoul National University 1 , Seoul, South Korea
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- Yong-Keun Park
- Department of Physics and Astronomy, Seoul National University 1 , Seoul, South Korea
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- Ji-Sung Yu
- Department of Physics and Astronomy, Seoul National University 1 , Seoul, South Korea
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- Joo-Sung Kim
- Department of Physics and Astronomy, Seoul National University 1 , Seoul, South Korea
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- Duck-Ho Kim
- Department of Physics and Astronomy, Seoul National University 1 , Seoul, South Korea
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- Byoung-Chul Min
- Center for Spintronics, Korea Institute of Science and Technology 2 , Seoul 02792, South Korea
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- Sug-Bong Choe
- Department of Physics and Astronomy, Seoul National University 1 , Seoul, South Korea
抄録
<jats:p>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.</jats:p>
収録刊行物
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- Applied Physics Letters
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Applied Physics Letters 112 (6), 062406-, 2018-02-05
AIP Publishing