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Effect of Electric Field on the Exchange-Stiffness Constant in a Co12Fe72B16 Disk-Shaped Nanomagnet 65 nm in Diameter

Title
Effect of Electric Field on the Exchange-Stiffness Constant in a Co12Fe72B16 Disk-Shaped Nanomagnet 65 nm in Diameter
Authors
Cho, JaehunMiwa, ShinjiYakushiji, KayKubota, HitoshiFukushima, AkioYou, Chun YeolYuasa, ShinjiSuzuki, Yoshishige
DGIST Authors
Cho, Jaehun; Miwa, Shinji; Yakushiji, Kay; Kubota, Hitoshi; Fukushima, Akio; You, Chun Yeol; Yuasa, Shinji; Suzuki, Yoshishige
Issue Date
2018-07
Citation
Physical Review Applied, 10(1)
Type
Article
Article Type
Article
Keywords
ATOMIC LAYERSTHIN-FILMSTEMPERATUREMAGNETISM
ISSN
2331-7019
Abstract
The exchange stiffness constant denoted by Aex is one of the fundamental physical quantities from the Heisenberg exchange Hamiltonian for ferromagnetic materials. A recent theoretical prediction shows the possibility that Aex in ferromagnetic metal films can be effectively tuned by the application of an electric field at the surface. In this paper, we demonstrate that the thermally excited spin-wave modes in magnetic tunnel junctions contain modulations upon application of an electric field through a MgO tunneling barrier. Different modulations of different spin-wave eigenmodes provide quantitative information regarding the electric field effects on the exchange stiffness, perpendicular anisotropy energy, and saturation magnetization. An electric field of 1 V/nm modulated Aex by 8.1% at room temperature. The results are significantly higher than those predicted from the Slater-Pauling curve and recent theoretical work. © 2018 American Physical Society.
URI
http://hdl.handle.net/20.500.11750/9224
DOI
10.1103/PhysRevApplied.10.014033
Publisher
American Physical Society
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


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