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  Spin waves in disordered materials

Buczek, P., Thomas, S., Marmodoro, A., Buczek, N., Zubizarreta, X., Hoffmann, M., et al. (2018). Spin waves in disordered materials. Journal of Physics: Condensed Matter, 30(42): 423001. doi:10.1088/1361-648X/aadefb.

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 Urheber:
Buczek, Paweł1, Autor
Thomas, Stefan2, Autor
Marmodoro, Alberto1, Autor
Buczek, Nadine1, Autor
Zubizarreta, Xabier2, Autor
Hoffmann, Martin1, Autor
Balashov, Timofey1, Autor
Wulfhekel, Wulf1, Autor
Zakeri, Khalil2, Autor
Ernst, Arthur2, Autor           
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1External Organizations, ou_persistent22              
2Max Planck Institute of Microstructure Physics, Max Planck Society, ou_2415691              

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 Zusammenfassung: We present an efficient methodology to study spin waves in disordered materials. The approach is based on a Heisenberg model and enables calculations of magnon properties in spin systems with disorder of an arbitrary kind and concentration of impurities. Disorder effects are taken into account within two complementary approaches. Magnons in systems with substitutional (uncorrelated) disorder can be efficiently calculated within a single-site coherent potential approximation for the Heisenberg model. From the computation point of view the method is inexpensive and directly applicable to systems like alloys and doped materials. It is shown that it performs exceedingly well across all concentrations and wave vectors. Another way is the direct numerical simulation of large supercells using a configurational average over possible samples. This approach is applicable to systems with an arbitrary kind of disorder. The effective interaction between magnetic moments entering the Heisenberg model can be obtained from first-principles using a self-consistent Green function method within the density functional theory. Thus, our method can be viewed as an ab initio approach and can be used for calculations of magnons in real materials.

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 Datum: 2018-09-272018-10-24
 Publikationsstatus: Erschienen
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 Identifikatoren: BibTex Citekey: P13480
DOI: 10.1088/1361-648X/aadefb
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Titel: Journal of Physics: Condensed Matter
  Kurztitel : J. Phys. Condens. Matter.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Bristol : IOP Publishing
Seiten: - Band / Heft: 30 (42) Artikelnummer: 423001 Start- / Endseite: - Identifikator: ISSN: 0953-8984
CoNE: https://pure.mpg.de/cone/journals/resource/954928562478