Abstract
We report the observation of spin transport through antiferromagnetic insulators using spin pumping driven by short-wavelength magnons. The short-wavelength magnons are excited by parametric pumping in a Pt/NiO/Y3Fe5O12 trilayer. The parametrically excited magnons in the Y3Fe5O12 layer inject a spin current into the NiO layer, which is detected electrically using the inverse spin Hall effect in the Pt layer. We found that the spin-pumping efficiency of the parametrically excited magnons in the Pt/NiO/Y3Fe5O12 film is nearly an order of magnitude smaller than that in the Pt/Y3Fe5O12 film. The suppression of the parametric spin-pumping efficiency induced by inserting the NiO layer is comparable to that of the FMR spin-pumping efficiency. We further found that the suppression of the spin-pumping efficiency due to the NiO insertion for the dipole-exchange magnons with the wave number of k∼103-104cm-1 is more significant than that for the exchange magnons with k∼105cm-1. This difference is attributed to two-magnon scattering and spin pinning due to antiferromagnetic grains in the NiO layer. These results provide insight into the understanding of the spin pumping into antiferromagnetic insulators.
| Original language | English |
|---|---|
| Article number | 144430 |
| Journal | Physical Review B |
| Volume | 100 |
| Issue number | 14 |
| DOIs | |
| Publication status | Published - 2019 Oct 21 |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
Parametric spin pumping into an antiferromagnetic insulator. / Numata, Taiki; Hayashi, Hiroki; Sakimura, Hiroto; Ando, Kazuya.
In: Physical Review B, Vol. 100, No. 14, 144430, 21.10.2019.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Parametric spin pumping into an antiferromagnetic insulator
AU - Numata, Taiki
AU - Hayashi, Hiroki
AU - Sakimura, Hiroto
AU - Ando, Kazuya
PY - 2019/10/21
Y1 - 2019/10/21
N2 - We report the observation of spin transport through antiferromagnetic insulators using spin pumping driven by short-wavelength magnons. The short-wavelength magnons are excited by parametric pumping in a Pt/NiO/Y3Fe5O12 trilayer. The parametrically excited magnons in the Y3Fe5O12 layer inject a spin current into the NiO layer, which is detected electrically using the inverse spin Hall effect in the Pt layer. We found that the spin-pumping efficiency of the parametrically excited magnons in the Pt/NiO/Y3Fe5O12 film is nearly an order of magnitude smaller than that in the Pt/Y3Fe5O12 film. The suppression of the parametric spin-pumping efficiency induced by inserting the NiO layer is comparable to that of the FMR spin-pumping efficiency. We further found that the suppression of the spin-pumping efficiency due to the NiO insertion for the dipole-exchange magnons with the wave number of k∼103-104cm-1 is more significant than that for the exchange magnons with k∼105cm-1. This difference is attributed to two-magnon scattering and spin pinning due to antiferromagnetic grains in the NiO layer. These results provide insight into the understanding of the spin pumping into antiferromagnetic insulators.
AB - We report the observation of spin transport through antiferromagnetic insulators using spin pumping driven by short-wavelength magnons. The short-wavelength magnons are excited by parametric pumping in a Pt/NiO/Y3Fe5O12 trilayer. The parametrically excited magnons in the Y3Fe5O12 layer inject a spin current into the NiO layer, which is detected electrically using the inverse spin Hall effect in the Pt layer. We found that the spin-pumping efficiency of the parametrically excited magnons in the Pt/NiO/Y3Fe5O12 film is nearly an order of magnitude smaller than that in the Pt/Y3Fe5O12 film. The suppression of the parametric spin-pumping efficiency induced by inserting the NiO layer is comparable to that of the FMR spin-pumping efficiency. We further found that the suppression of the spin-pumping efficiency due to the NiO insertion for the dipole-exchange magnons with the wave number of k∼103-104cm-1 is more significant than that for the exchange magnons with k∼105cm-1. This difference is attributed to two-magnon scattering and spin pinning due to antiferromagnetic grains in the NiO layer. These results provide insight into the understanding of the spin pumping into antiferromagnetic insulators.
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U2 - 10.1103/PhysRevB.100.144430
DO - 10.1103/PhysRevB.100.144430
M3 - Article
AN - SCOPUS:85074424547
VL - 100
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 2469-9950
IS - 14
M1 - 144430
ER -