Enhancement of two-magnon scattering induced by a randomly distributed antiferromagnetic exchange field
| Autor: | Ji Shi, Yoshio Nakamura, Takashi Harumoto, Hiroto Sakimura, Kazuya Ando, Akio Asami |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Condensed matter physics Field (physics) Scattering Magnon Non-blocking I/O Conductance 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Ferromagnetism 0103 physical sciences Antiferromagnetism Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Spin-½ |
| Zdroj: | Physical Review B. 98 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | We report a quantitative study of two-magnon scattering in ${\mathrm{Ni}}_{81}{\mathrm{Fe}}_{19}$/NiO bilayers with various NiO thicknesses ${d}_{\mathrm{NiO}}$. We found that the magnetic damping of the ${\mathrm{Ni}}_{81}{\mathrm{Fe}}_{19}$/NiO bilayer strongly depends on ${d}_{\mathrm{NiO}}$, which evidences that the amplitude of the two-magnon scattering increases with increasing the thickness of the antiferromagnetic layer. The enhancement of the two-magnon scattering in the ${\mathrm{Ni}}_{81}{\mathrm{Fe}}_{19}$/NiO bilayer is attributed to the increase of randomly distributed antiferromagnetic exchange fields. We calculated the spin-mixing conductance by eliminating the effect of the two-magnon scattering, and found that the value is at $8.1\phantom{\rule{0.16em}{0ex}}{\mathrm{nm}}^{\ensuremath{-}2}$ for the ${\mathrm{Ni}}_{81}{\mathrm{Fe}}_{19}$/NiO interface. Our result gives further insight on the role of the two-magnon scattering in manipulating magnetic damping, which is crucial for generation and transmission of spin currents in ferromagnet/antiferromagnet systems. |
| Databáze: | OpenAIRE |
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