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The buffer layer effect of the exchange stiffness constants on Co thin film

Title
The buffer layer effect of the exchange stiffness constants on Co thin film
Authors
Lee, KwangHyunCho, JaehunLee, Chan-KangKim, JoonwooYou, Chun-YeolByun, MyunghwanKim, June-Seo
DGIST Authors
Lee, KwangHyun; Cho, Jaehun; Lee, Chan-Kang; Kim, Joonwoo; You, Chun-Yeol; Byun, Myunghwan; Kim, June-Seo
Issue Date
2020-10
Citation
Journal of Magnetism and Magnetic Materials, 512, 167057
Type
Article
Article Type
Article
Author Keywords
Brillouin light scatteringCo thin filmExchange stiffnessSaturation magnetization
Keywords
DZYALOSHINSKII-MORIYA INTERACTIONMAGNETIC-PROPERTIESBRILLOUIN-SCATTERINGLIGHT-SCATTERINGSPIN-WAVESSTIFFNESSSKYRMIONANISOTROPY
ISSN
0304-8853
Abstract
The exchange stiffness of Cobalt thin films with various buffer layers (Pd, Pt, Ta, and no buffer) has been studied by Brillouin scattering in the applied magnetic field of up to 175 mT. We found that Pd and Pt buffer layers led to higher exchange stiffness constants more than 12% compared to the Ta buffer layer, whereas, it was difficult to determine the exchange stiffness constant with no buffer layer due to broad spinwave spectra with poor signal-to-noise ratios. The determined exchange stiffness constant value is 25.7 ± 0.1, 25.6 ± 0.2, and 22.7 ± 0.1 pJ/m for Pd, Pt, and Ta buffer layers. We also observed that the Pd-underlayered sample gives us the largest saturation magnetization and in contrast the Ta underlayer shows the relatively smaller values. This observation indicates that the exchange stiffness constant and the saturation magnetization exhibit the same trend on various buffer layers. © 2020 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/12100
DOI
10.1016/j.jmmm.2020.167057
Publisher
Elsevier BV
Related Researcher
  • Author You, Chun-Yeol Spin Phenomena for Information Nano-devices(SPIN) Lab
  • Research Interests Spintronics; Condensed Matter Physics; Magnetic Materials & Thin Films; Micromagnetic Simulations; Spin Nano-Devices
Files:
There are no files associated with this item.
Collection:
Department of Emerging Materials ScienceSpin Phenomena for Information Nano-devices(SPIN) Lab1. Journal Articles
Division of Nanotechnology1. Journal Articles


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