Scholarlink

<p>Half-metallic ferromagnets exhibit a perfect spin-polarization at the Fermi energy. Among many candidates, Co<sub>2</sub>MnSi Heusler alloy is the most investigated material due to its half-metallic nature and high Curie temperature (<i>T</i><sub>C</sub>). Magnetic junction devices using Co<sub>2</sub>MnSi show remarkable performance at low temperatures. However, the performance is significantly degraded at room temperature, which requires a detailed understanding of the temperature-dependent electronic structure of Co<sub>2</sub>MnSi films. Here, using surface-sensitive spin- and angle-resolved photoelectron spectroscopy combined with first-principles calculations, we verify the temperature- and momentum-dependent spin-polarization of Co<sub>2</sub>MnSi thin-film. The recorded spin-polarization reaches &#xa0;~&#xa0;60-75% at 50 K, while it reduces &#xa0;~&#xa0;30-50% at 300 K. The observed surface-specific spin-depolarization behavior can be described by the thermally excited magnon model even well below <i>T</i><sub>C</sub>, and we conclude that the spin-fluctuation is markedly enhanced on its surface. Our findings provide insights into the temperature-dependent electronic structure of half-metallic Heusler films, which could have significant implications for future spintronic applications.</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

Surface-specific thermal spin-depolarization on the half-metallic Heusler films

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年1月4日

查看全文
  • Kazuki Sumida,
  • Masaaki Kakoki,
  • Yuya Sakuraba,
  • Keisuke Masuda,
  • Kazuki Goto,
  • Takashi Kono,
  • Koji Miyamoto,
  • Yoshio Miura,
  • Kazuhiro Hono,
  • Taichi Okuda,
  • Akio Kimura

摘要

Half-metallic ferromagnets exhibit a perfect spin-polarization at the Fermi energy. Among many candidates, Co2MnSi Heusler alloy is the most investigated material due to its half-metallic nature and high Curie temperature (TC). Magnetic junction devices using Co2MnSi show remarkable performance at low temperatures. However, the performance is significantly degraded at room temperature, which requires a detailed understanding of the temperature-dependent electronic structure of Co2MnSi films. Here, using surface-sensitive spin- and angle-resolved photoelectron spectroscopy combined with first-principles calculations, we verify the temperature- and momentum-dependent spin-polarization of Co2MnSi thin-film. The recorded spin-polarization reaches  ~ 60-75% at 50 K, while it reduces  ~ 30-50% at 300 K. The observed surface-specific spin-depolarization behavior can be described by the thermally excited magnon model even well below TC, and we conclude that the spin-fluctuation is markedly enhanced on its surface. Our findings provide insights into the temperature-dependent electronic structure of half-metallic Heusler films, which could have significant implications for future spintronic applications.