Magnetization Precession at Sub-Terahertz Frequencies in Polycrystalline Cu2Sb-Type (Mn–Cr)AlGe Ultrathin Films

Yuta Sasaki*, Ryoya Hiramatsu, Yohei Kota, Takahide Kubota, Yoshiaki Sonobe, Akimasa Sakuma, Koki Takanashi, Shinya Kasai, Yukiko K. Takahashi

*この研究の対応する著者

研究成果: Article査読

抄録

A ferromagnetic metal nanolayer with a large perpendicular magnetic anisotropy, small saturation magnetization, and small magnetic damping constant is a crucial requirement for high-speed spintronic devices. Fabrication of these devices on Si/SiO2 amorphous substrates with polycrystalline structure is also strongly desired for the mass production industry. This study involves the investigation of sub-terahertz (THz) magnetization precessional motion in a newly developed material system consisting of Cu2Sb-type MnAlGe and (Mn–Cr)AlGe films by means of an all-optical pump-probe method. These materials exhibit large perpendicular magnetic anisotropy in regions of a few nanometers in size. The pseudo-2D crystal structures are clearly observed in the high-resolution transmission electron microscopy (TEM) images for the film samples grown on thermally oxidized silicon substrates. The TEM images also show a partial substitution of Cr atoms for the Mn sites in MnAlGe. A magnetization precession frequency of 0.164 THz with a relatively small effective magnetic damping constant of 0.012 is obtained for (Mn–Cr)AlGe. Theoretical calculation infers that the modification of the total density of states by Cr substitution decreases the intrinsic magnetic damping constant of (Mn–Cr)AlGe.

本文言語English
論文番号2200378
ジャーナルSmall
18
20
DOI
出版ステータスPublished - 2022 5月 19
外部発表はい

ASJC Scopus subject areas

  • バイオテクノロジー
  • 生体材料
  • 化学 (全般)
  • 材料科学(全般)

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