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The sign of the interfacial Dzyaloshinskii-Moriya interaction in ultrathin amorphous and polycrystalline magnetic films
- The sign of the interfacial Dzyaloshinskii-Moriya interaction in ultrathin amorphous and polycrystalline magnetic films
- Cho, Jaehun; Kim, Nam-Hui; Kang, Seung Ku; Hwang, Hee-Kyeong; Jung, Jin-Young; Swagten, Henk J. M.; Kim, June-Seo; You, Chun-Yeol
- DGIST Authors
- Kim, Nam-Hui; Hwang, Hee-Kyeong; Kim, June-Seo; You, Chun-Yeol
- Issue Date
- Journal of Physics D-Applied Physics, 50(42)
- Article Type
- Brillouin Light Scattering; Dependence; Domain-Walls; Driven; Dynamics; Dzyaloshinskii-Moriya Interaction; Exchange; Magnetic; Order; Physics; Real-Space Observation; Spin-Orbit Coupling; Thinfilm
- We investigate the sign of the interfacial Dzyaloshinskii-Moriya interaction (iDMI) energy density in system with inversion symmetry breaking for amorphous and polycrystalline ferromagnetic layers (CoFeB, Co) sandwiched by two different or the same heavy metals (Pt, Ta). By employing Brillouin light scattering, we observe non-reciprocal spin-wave dispersions which is a fingerprint of iDMI in SiO2/(Pt, Ta)/(CoFeB, Co)/(Pt, Ta) systems. We carefully confirm that the signs of DMI of structurally inverted systems are changed accordingly. Negative iDMI for SiO2/Pt/(CoFeB, Co)/Ta and positive iDMI for SiO2/Ta/(CoFeB, Co)/Pt are observed, and iDMI of the symmetric structures (Pt/CoFeB/Pt and Ta/CoFeB/Ta) are not measureable with our Brillouin light scattering setup due to a negligible iDMI. For amorphous CoFeB, the magnitudes of iDMI are the same within the experimental error regardless the stacking order. For the textured Co, however, the magnitude of iDMI for Pt/Co/Ta is about 30 % larger than Ta/Co/Pt structure.
- IOP PUBLISHING LTD
- Related Researcher
You, Chun Yeol
Spin Phenomena for Information Nano-devices(SPIN) Lab
Spintronics; Condensed Matter Physics; Magnetic Materials & Thin Films; Micromagnetic Simulations; Spin Nano-Devices
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- DGIST-LBNL Research Center for Emerging Materials1. Journal Articles
Department of Emerging Materials ScienceSpin Phenomena for Information Nano-devices(SPIN) Lab1. Journal Articles
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