Huge domain-wall speed variation with respect to ferromagnetic layer thickness in ferromagnetic Pt/Co/TiO2/Pt films

DOI PDF 2 Citations
  • Dae-Yun Kim
    Department of Physics and Astronomy, Seoul National University 1 , Seoul, South Korea
  • Min-Ho Park
    Department of Physics and Astronomy, Seoul National University 1 , Seoul, South Korea
  • Yong-Keun Park
    Department of Physics and Astronomy, Seoul National University 1 , Seoul, South Korea
  • Ji-Sung Yu
    Department of Physics and Astronomy, Seoul National University 1 , Seoul, South Korea
  • Joo-Sung Kim
    Department of Physics and Astronomy, Seoul National University 1 , Seoul, South Korea
  • Duck-Ho Kim
    Department of Physics and Astronomy, Seoul National University 1 , Seoul, South Korea
  • Byoung-Chul Min
    Center for Spintronics, Korea Institute of Science and Technology 2 , Seoul 02792, South Korea
  • Sug-Bong Choe
    Department of Physics and Astronomy, Seoul National University 1 , Seoul, South Korea

Abstract

<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>

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