Focusing and caustic of spin waves in antiferromagnetic crystals with BCT lattice
Source abstract
Abstract
Abstract The features of focusing and caustic of spin waves in antiferromagnetic crystals with body-centered tetragonal (BCT) lattice in the framework of Heisenberg model are investigated. The model takes into account the interaction of an atom’s spin with its first and second neighbors. It is shown that magnon focusing picture depends on the ratio between the exchange coupling constants of atom’s spin with first ( J 1 ) and second ( J 2 ) neighbors. If the value of J 2 is positive then the spin waves focusing occurs in the [1 0 1], [1 1 0], and [1 0 0] directions and if J 2 is negative then the caustic of magnons forms in some directions. The region of frequencies of spin waves where the caustic can be observed is obtained. The dependence of caustic direction on magnon frequency is investigated.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Acoustic Wave Resonator Technologies · Physics of Superconductivity and Magnetism · Magnetic properties of thin films
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References (24)
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