Specificities of Spin Wave Focusing in EuO and EuS Crystals

Specificities of spin wave focusing in EuO and EuS crystals are studied. It is shown that spin wave focusing is absent in the long-wave approximation: it is observed only for wave vectors in the second half of the Brillouin zone ( aq π, where a is the lattice constant and q is the magnitude of the w...

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Bibliographic Details
Published in:Physics of the solid state 2019-02, Vol.61 (2), p.117-126
Main Authors: Bakharev, S. M., Savchenko, S. P., Tankeyev, A. P.
Format: Article
Language:English
Subjects:
APPROXIMATIONS
BRILLOUIN ZONES
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTALS
EUROPIUM OXIDES
EUROPIUM SULFIDES
EXCHANGE INTERACTIONS
Exchanging
FOCUSING
LATTICE PARAMETERS
MAGNETIC MOMENTS
Magnetism
MAGNONS
Physics
Physics and Astronomy
Solid State Physics
SPECIFICITY
SPIN WAVES
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Summary:Specificities of spin wave focusing in EuO and EuS crystals are studied. It is shown that spin wave focusing is absent in the long-wave approximation: it is observed only for wave vectors in the second half of the Brillouin zone ( aq π, where a is the lattice constant and q is the magnitude of the wave vector). It was found that, for EuO and EuS crystals, the directions of spin wave focusing differ due to the different signs of the exchange integrals responsible for the exchange interaction of the magnetic moment with the second neighbors. The directions along which a magnon caustic is formed are determined.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783419020045