Abstract
A theoretical study of the magnon-drag Peltier and Seebeck effects in ferromagnetic metals is presented. A magnon heat current is described perturbatively from the microscopic viewpoint with respect to electron-magnon interactions and the electric field. Then, the magnon-drag Peltier coefficient Γ mag is obtained as the ratio between the magnon heat current and the electric charge current. We show that Γ mag = C magT 5/2 at a low temperature T; that the coefficient C mag is proportional to the spin polarization P of the electric conductivity; and that P > 0 for C mag < 0, but P < 0 for C mag > 0. From experimental results for magnon-drag Peltier effects, we estimate that the strength of the electron-magnon interaction is about 0.3 eV·Å 3/2 for permalloy.
Original language | English |
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Article number | 113602 |
Journal | journal of the physical society of japan |
Volume | 81 |
Issue number | 11 |
DOIs | |
Publication status | Published - 2012 Nov |
Keywords
- Electron-magnon interaction
- Magnon drag
- Peltier effect
- Seebeck effect
- Spin caloritronics
- Spin current
- Spintronics
ASJC Scopus subject areas
- Physics and Astronomy(all)