The sign of the interfacial Dzyaloshinskii-Moriya interaction in ultrathin amorphous and polycrystalline magnetic films
| Autor: | Seung Ku Kang, Jaehun Cho, Chun-Yeol You, Hee Kyeong Hwang, Jinyoung Jung, NH Nam Kim, Hjm Henk Swagten, June-Seo Kim |
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| Přispěvatelé: | Physics of Nanostructures |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Dzyaloshinskii-Moriya interaction
Materials science Acoustics and Ultrasonics Condensed matter physics Point reflection Stacking 02 engineering and technology Spin–orbit interaction 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Light scattering Surfaces Coatings and Films Electronic Optical and Magnetic Materials Amorphous solid spin-orbit coupling Brillouin zone Brillouin light scattering Ferromagnetism 0103 physical sciences Crystallite magnetic thinfilm 010306 general physics 0210 nano-technology |
| Zdroj: | Journal of Physics D: Applied Physics, 50(42):425004, 1-6. Institute of Physics |
| ISSN: | 0022-3727 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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