Scholarlink

<p>Skyrmions are topologically protected magnetic structures originating from Dzyaloshinbskii–Moriya Interaction (DMI) which can be driven by a spin-polarized current making it a candidate for many different novel spintronic devices. However, the transport velocity is proportional to the size of the skyrmion rendering the effort of miniaturizing spintronics devices useless indicating that it is not possible to realise high-speed transport, small size and low operating current at the same time. One approach to solving the trilemma is to increase the spin Hall angle <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_91415_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="29" /> </InlineMediaObject> <EquationSource Format="TEX">\(\theta _{SH}\)</EquationSource> </InlineEquation>, the conversion ratio between charge current and spin current, in the heavy metal layer. For example, beta-tungsten (<InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_91415_Article_IEq2.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="15" /> </InlineMediaObject> <EquationSource Format="TEX">\(\beta\)</EquationSource> </InlineEquation>-W) has attracted attention due to its high spin Hall angle, abundance in nature and the potential to combine with other materials to form complex structures. To characterise the use of <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_91415_Article_IEq3.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="15" /> </InlineMediaObject> <EquationSource Format="TEX">\(\beta\)</EquationSource> </InlineEquation>-W as a heavy metal layer along with a CoFeB magnetic layer, the interfacial DMI and the external field required to generate skyrmions were estimated to be 1.5 <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_91415_Article_IEq4.gif" Format="GIF" Height="22" Rendition="HTML" Resolution="72" Type="Linedraw" Width="51" /> </InlineMediaObject> <EquationSource Format="TEX">\(\hbox {mJ/m}^2\)</EquationSource> </InlineEquation> and 0.1 T respectively, which were confirmed to be realistic. In that case, the about 10 nm diameter skyrmion was transported under SOT at a velocity of about 40 m/s, which has the potential for skyrmion-based unconventional computing devices like skyrmion race track memory and logic gate.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Computational study of skyrmion stability and transport on W/CoFeB

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年3月5日

查看全文
  • Tsz Chung Cheng,
  • Lin Zhang,
  • Yuichiro Kurokawa,
  • Ryuta Satone,
  • Kazuhiko Tokunaga,
  • Hiromi Yuasa

摘要

Skyrmions are topologically protected magnetic structures originating from Dzyaloshinbskii–Moriya Interaction (DMI) which can be driven by a spin-polarized current making it a candidate for many different novel spintronic devices. However, the transport velocity is proportional to the size of the skyrmion rendering the effort of miniaturizing spintronics devices useless indicating that it is not possible to realise high-speed transport, small size and low operating current at the same time. One approach to solving the trilemma is to increase the spin Hall angle \(\theta _{SH}\) , the conversion ratio between charge current and spin current, in the heavy metal layer. For example, beta-tungsten ( \(\beta\) -W) has attracted attention due to its high spin Hall angle, abundance in nature and the potential to combine with other materials to form complex structures. To characterise the use of \(\beta\) -W as a heavy metal layer along with a CoFeB magnetic layer, the interfacial DMI and the external field required to generate skyrmions were estimated to be 1.5 \(\hbox {mJ/m}^2\) and 0.1 T respectively, which were confirmed to be realistic. In that case, the about 10 nm diameter skyrmion was transported under SOT at a velocity of about 40 m/s, which has the potential for skyrmion-based unconventional computing devices like skyrmion race track memory and logic gate.