Scholarlink

<p>RuO<sub>2</sub> is one of the most studied altermagnetic candidate materials. However, it has recently been scrutinized as evidence emerged for its lack of any magnetic order. In this work, we study bilayers of epitaxial RuO<sub>2</sub> and ferromagnetic permalloy (Fe<sub>19</sub>Ni<sub>81</sub>) by time-domain terahertz spectroscopy, probing for three mechanisms of laser-induced charge dynamics: the inverse spin Hall effect (ISHE), electrical anisotropic conductivity (EAC), and inverse altermagnetic spin-splitting effect (IASSE). We examine four orientations of RuO<sub>2</sub>: (001), (100), (110), and (101). Our results are consistent with charge dynamics induced by only the ISHE and EAC and do not indicate the presence of IASSE for either as-deposited or field-annealed samples, casting further doubt on the existence of altermagnetism in RuO<sub>2</sub>. In addition, we find that the combination of ISHE and EAC in the (101) oriented sample produces THz emission that is tunable between linear and elliptical polarization by modulation of the external magnetic field.</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

Revisiting altermagnetism in RuO2: a study of laser-pulse induced charge dynamics by time-domain terahertz spectroscopy

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年5月13日

查看全文
  • David T. Plouff,
  • Laura Scheuer,
  • Shreya Shrestha,
  • Weipeng Wu,
  • Nawsher J. Parvez,
  • Subhash Bhatt,
  • Xinhao Wang,
  • Lars Gundlach,
  • M. Benjamin Jungfleisch,
  • John Q. Xiao

摘要

RuO2 is one of the most studied altermagnetic candidate materials. However, it has recently been scrutinized as evidence emerged for its lack of any magnetic order. In this work, we study bilayers of epitaxial RuO2 and ferromagnetic permalloy (Fe19Ni81) by time-domain terahertz spectroscopy, probing for three mechanisms of laser-induced charge dynamics: the inverse spin Hall effect (ISHE), electrical anisotropic conductivity (EAC), and inverse altermagnetic spin-splitting effect (IASSE). We examine four orientations of RuO2: (001), (100), (110), and (101). Our results are consistent with charge dynamics induced by only the ISHE and EAC and do not indicate the presence of IASSE for either as-deposited or field-annealed samples, casting further doubt on the existence of altermagnetism in RuO2. In addition, we find that the combination of ISHE and EAC in the (101) oriented sample produces THz emission that is tunable between linear and elliptical polarization by modulation of the external magnetic field.