First-principles study of exchange interactions of yttrium iron garnet
| Autor: | Joseph Barker, Guang Xi Jin, Lixin He, Ke Xia, Gerrit E. W. Bauer, Li Shan Xie |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Condensed Matter - Materials Science
Materials science Condensed matter physics Magnon Yttrium iron garnet Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Insulator (electricity) 02 engineering and technology Neutron scattering 021001 nanoscience & nanotechnology Residual 01 natural sciences Condensed Matter::Materials Science chemistry.chemical_compound chemistry 0103 physical sciences Spin model Coulomb Curie temperature Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B (Condensed Matter and Materials Physics), 95(1) |
| ISSN: | 2469-9969 2469-9950 1098-0121 |
| DOI: | 10.1103/physrevb.95.014423 |
| Popis: | Yttrium Iron Garnet is the ubiquitous magnetic insulator used for studying pure spin currents. The exchange constants reported in the literature vary considerably between different experiments and fitting procedures. Here we calculate them from first-principles. The local Coulomb correction (U - J) of density functional theory is chosen such that the parameterized spin model reproduces the experimental Curie temperature and a large electronic band gap, ensuring an insulating phase. The magnon spectrum calculated with our parameters agrees reasonably well with that measured by neutron scattering. A residual disagreement about the frequencies of optical modes indicates the limits of the present methodology. 8 pages, 5 figures |
| Databáze: | OpenAIRE |
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