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Magnetization Precession at Sub-Terahertz Frequencies in Polycrystalline Cu 2 Sb-Type (Mn-Cr)AlGe Ultrathin Films.
- Source :
-
Small (Weinheim an der Bergstrasse, Germany) [Small] 2022 May; Vol. 18 (20), pp. e2200378. Date of Electronic Publication: 2022 Apr 15. - Publication Year :
- 2022
-
Abstract
- 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/SiO <subscript>2</subscript> 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 Cu <subscript>2</subscript> Sb-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.<br /> (© 2022 The Authors. Small published by Wiley-VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1613-6829
- Volume :
- 18
- Issue :
- 20
- Database :
- MEDLINE
- Journal :
- Small (Weinheim an der Bergstrasse, Germany)
- Publication Type :
- Academic Journal
- Accession number :
- 35429094
- Full Text :
- https://doi.org/10.1002/smll.202200378