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1 Book chapter

Spin Waves in Anisotropic Magnets

Lindgård, Per-Anker

Crystal Field Effects in Metals and Alloys — 1977, pp. 9-18

The theory of excitations in anisotropic magnets is reviewed. It will be shown, by discussion of a simple model system with Heisenberg interaction plus planar single ion anisotropy, that the conventional spinwave theory is treating the single ion anisotropy very poorly. A new Bose operator

Year: 1977

Language: English

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2 Journal article

Theory of Spin Waves in Strongly Anisotropic Magnets

Lindgård, Per-Anker; Cooke, J. F.

Physical Review B — 1976, Volume 14, Issue 11, pp. 5056-5059

A new infinite-order perturbation approach to the theory of spin waves in strongly anisotropic magnets is introduced. The system is transformed into one with effective two-ion anisotropy and considerably reduced ground-state corrections. A general expression for the spin-wave energy, valid to any

Year: 1976

Language: English

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3 Journal article · Conference paper

Spin Wave Theory of Strongly Anisotropic Magnets

Lindgård, Per-Anker

Physica A: Statistical Mechanics and Its Applications — 1977, Volume 86, Issue 88, pp. 53-54

A strong anisotropy gives rise to a non-spherical precession of the spins with different amplitudes in the x and y directions. The highly anharmonic exchange interaction thereby becomes effectively anisotropic. The possibility of detecting a genuine two-ion anisotropy is discussed, and comments

Year: 1977

Language: English

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4 Journal article

Canonical transform theory of spin‐waves in strongly anisotropic magnets

Cooke, J. F.; Lindgård, P.‐A.

Journal of Applied Physics — 1978, Volume 49, Issue 3, pp. 2136-2138

We have developed a new infinite‐order perturbation approach for treating strongly anisotropic magnets. This formalism is based on a canonical transformation of a given system into a new system with an effective two‐ion anisotropy which, for example, can be treated by conventional spin‐wave

Year: 1978

Language: Undetermined

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gja bpdeco hlnfkmi

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