Scholarlink

<p>The chiral magnetoelectric insulator Cu<sub>2</sub>OSeO<sub>3</sub> hosts a rich and anisotropic magnetic phase diagram that includes helical, conical, field-polarised, tilted conical, and skyrmion lattice phases. Using resonant elastic x-ray scattering (REXS), we uncover a new spiral state confined to the surface of Cu<sub>2</sub>OSeO<sub>3</sub>. This surface-confined spiral state (SSS) displays a real-space pitch of ~ 120 nm, which remarkably is twice the length of the incommensurate structures observed to-date in Cu<sub>2</sub>OSeO<sub>3</sub>. The SSS phase emerges at temperatures below 30 K when the magnetic field is applied between 3<sup>∘</sup> to 18<sup>∘</sup> away from the 〈110〉 crystallographic axes. Its surface localisation is demonstrated through a combination of REXS in reflection and transmission geometries, with complementary small-angle neutron scattering measurements suggesting its absence from the bulk. We attribute the stabilisation of the SSS to competing anisotropic interactions at the crystal surface. The discovery of a robust, surface-confined spiral paves the way for engineering energy-efficient, nanoscale spin-texture platforms for next-generation devices.</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

A surface-confined spiral state with the double period in the cubic chiral helimagnet Cu2OSeO3

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月21日

查看全文
  • Priya R. Baral,
  • Oleg I. Utesov,
  • Samuel H. Moody,
  • Matthew T. Littlehales,
  • Pierluigi Gargiani,
  • Manuel Valvidares,
  • Robert Cubitt,
  • Nina-Juliane Steinke,
  • Chen Luo,
  • Florin Radu,
  • Arnaud Magrez,
  • Jonathan S. White,
  • Victor Ukleev

摘要

The chiral magnetoelectric insulator Cu2OSeO3 hosts a rich and anisotropic magnetic phase diagram that includes helical, conical, field-polarised, tilted conical, and skyrmion lattice phases. Using resonant elastic x-ray scattering (REXS), we uncover a new spiral state confined to the surface of Cu2OSeO3. This surface-confined spiral state (SSS) displays a real-space pitch of ~ 120 nm, which remarkably is twice the length of the incommensurate structures observed to-date in Cu2OSeO3. The SSS phase emerges at temperatures below 30 K when the magnetic field is applied between 3∘ to 18∘ away from the 〈110〉 crystallographic axes. Its surface localisation is demonstrated through a combination of REXS in reflection and transmission geometries, with complementary small-angle neutron scattering measurements suggesting its absence from the bulk. We attribute the stabilisation of the SSS to competing anisotropic interactions at the crystal surface. The discovery of a robust, surface-confined spiral paves the way for engineering energy-efficient, nanoscale spin-texture platforms for next-generation devices.