NDLI: Gilbert Damping Constant of Quaternary Co$_{2}$MnAl$_{1−x }$Sn$

Content Provider	Springer Nature Link
Author	Koçbay, Abdullah N. Yilgin, Resul Topkaya, Ramazan Ahsen, Ali Ş. Öztürk, Osman Aktaş, Bekir
Copyright Year	2011
Abstract	Polycrystalline quaternary Co$_{2}$MnAl$_{1−x }$Sn$_{ x }$ films with x=0.25, 0.5, 0.75, 1 were prepared at room temperature using magnetron sputtering technique on SiO$_{2}$ substrates and post-annealed at various temperatures. We investigated the crystal structures, magnetic properties, and magnetic damping constants (α) of the prepared films. Out-of-plane angular dependences of the resonance field and the linewidth of the ferromagnetic resonance spectra were measured and analyzed using the Landau–Lifshitz–Gilbert equation to determine the magnetic properties and damping constant. Co$_{2}$MnAl$_{0.75}$Sn$_{0.25}$ and Co$_{2}$MnSn films had A2 ordered crystal structure while Co$_{2}$MnAl$_{0.25}$Sn$_{0.75}$ and Co$_{2}$MnAl$_{0.5}$Sn$_{0.5}$ films had A2 ordering up to 400 °C and 300 °C annealing temperature, respectively, and they had B2 ordering for the remaining temperatures. Also the crystal structure deteriorated at 600 °C for all of the film systems. The saturation magnetization, M $_{ S }$, of films increased with annealing temperature till 400 °C except Co$_{2}$MnAl$_{0.5}$Sn$_{0.5}$ in which M $_{ S }$ increased till 500 °C, which is consistent with the structural analysis. The effective magnetization was obtained from the FMR spectra and it was found that it decreased with increasing Sn-concentration and reached a minimum value at Co$_{2}$MnAl$_{0.25}$Sn$_{0.75}$ composition. Lastly, Co$_{2}$MnAl$_{1−x }$Sn$_{ x }$ films annealed at 500 °C showed the best crystal ordering. The lowest α value was 0.008 and obtained from Co$_{2}$MnAl$_{0.5}$Sn$_{0.5}$ films annealed at 500 °C.
Starting Page	2813
Ending Page	2817
Page Count	5
File Format	PDF
ISSN	15571939
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	25
Issue Number	8
e-ISSN	15571947
Language	English
Publisher	Springer US
Publisher Date	2011-08-25
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Heusler alloy Ferromagnetic resonance Gilbert damping Half metallic MRAM Condensed Matter Physics Characterization and Evaluation of Materials Strongly Correlated Systems, Superconductivity Magnetism, Magnetic Materials
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Condensed Matter Physics

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