Journal article
Linear spin-wave theory of incommensurably modulated magnets
Institut Laue-Langevin1
Nano-Microstructures in Materials, Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2
Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
Risø National Laboratory for Sustainable Energy, Technical University of Denmark4
Calculations of linearized theories of spin dynamics encounter difficulties when applied to incommensurable magnetic phases: lack of translational invariance leads to an infinite coupled system of equations. The authors resolve this for the case of a `single-Q' structure by mapping onto the problem of diagonalizing a quasiperiodic Hamiltonian of tight-binding type in one dimension.
This allows for calculation of the correlation functions relevant to neutron scattering or magnetic resonance experiments. With the application to the case of a longitudinally modulated magnet a number of new predictions are made: at higher frequency there appear bands of response sharply defined in frequency, but broad in momentum transfer; at low frequencies there is a response maximum at the q vector corresponding to the modulation vector.
They discuss generalizations necessary for application to rare-earth magnets
Language: | English |
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Year: | 1986 |
Pages: | 1976-1981 |
ISSN: | 01631829 , 1550235x , 24699950 and 10953795 |
Types: | Journal article |
DOI: | 10.1103/PhysRevB.33.1976 |