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<p>Combination of altermagnetism and ferroic orders, such as ferroelectric switchable altermagnetism [<i>Phys. Rev. Lett</i>. <b>134</b>, 106801 (2025) and <i>Phys. Rev. Lett</i>. <b>134</b>, 106802 (2025)], offers a powerful route to achieve nonvolatile switching of altermagnetic spin splitting. In this work, by synergizing altermagnetism and ferroelasticity, we propose the concept of <i>ferroelastic altermagnets</i> in which the ferroelastic crystal reorientation can drive multistate nonvolatile switching of the altermagnetic spin splitting via <i>altermagnetoelastic effect</i>. Using monolayers RuF<sub>4</sub> and CuF<sub>2</sub> as material candidates, we demonstrate 2-state and 3-state altermagnetic spin splitting switching as driven by ferroelastic strain states. Transport calculation shows that multistate spin conductivities can be ferroelastically encoded in ferroelastic altermagnets, thus suggesting the potential of ferroelastic altermagnets as nonvolatile nanomechanical spin switches. The proposed concept of ferroelastic altermagnetism enriches the emerging landscape of multiferroic altermagnetism and shall pave a way towards straintronic-spintronic device applications.</p>

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Ferroelastic altermagnetism

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月16日

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  • Rui Peng,
  • Shibo Fang,
  • Pin Ho,
  • Fanxin Liu,
  • Tong Zhou,
  • Junwei Liu,
  • Yee Sin Ang

摘要

Combination of altermagnetism and ferroic orders, such as ferroelectric switchable altermagnetism [Phys. Rev. Lett. 134, 106801 (2025) and Phys. Rev. Lett. 134, 106802 (2025)], offers a powerful route to achieve nonvolatile switching of altermagnetic spin splitting. In this work, by synergizing altermagnetism and ferroelasticity, we propose the concept of ferroelastic altermagnets in which the ferroelastic crystal reorientation can drive multistate nonvolatile switching of the altermagnetic spin splitting via altermagnetoelastic effect. Using monolayers RuF4 and CuF2 as material candidates, we demonstrate 2-state and 3-state altermagnetic spin splitting switching as driven by ferroelastic strain states. Transport calculation shows that multistate spin conductivities can be ferroelastically encoded in ferroelastic altermagnets, thus suggesting the potential of ferroelastic altermagnets as nonvolatile nanomechanical spin switches. The proposed concept of ferroelastic altermagnetism enriches the emerging landscape of multiferroic altermagnetism and shall pave a way towards straintronic-spintronic device applications.