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Title: Theory of magnon motive force in chiral ferromagnets

Authors:
;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1262442
Grant/Contract Number:
SC0014189
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 2; Related Information: CHORUS Timestamp: 2016-07-14 00:09:54; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Güngördü, Utkan, and Kovalev, Alexey A. Theory of magnon motive force in chiral ferromagnets. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.020405.
Güngördü, Utkan, & Kovalev, Alexey A. Theory of magnon motive force in chiral ferromagnets. United States. doi:10.1103/PhysRevB.94.020405.
Güngördü, Utkan, and Kovalev, Alexey A. 2016. "Theory of magnon motive force in chiral ferromagnets". United States. doi:10.1103/PhysRevB.94.020405.
@article{osti_1262442,
title = {Theory of magnon motive force in chiral ferromagnets},
author = {Güngördü, Utkan and Kovalev, Alexey A.},
abstractNote = {},
doi = {10.1103/PhysRevB.94.020405},
journal = {Physical Review B},
number = 2,
volume = 94,
place = {United States},
year = 2016,
month = 7
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevB.94.020405

Citation Metrics:
Cited by: 2works
Citation information provided by
Web of Science

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  • Magnon energies, renormalized in a Hartree -- Fock approximation, were derived. The model includes isotropic and anisotropic exchange interactions, a crystal field of hcp symmetry, magnetoelastic interactions, and dipolar interactions. The novel feature of the theory is a modification of magnon renormalization by the ellipticity of spin precession that is a characteristic of highly anisotropic ferromagnets. (auth)
  • The method of equations of motion for spin operators in the case of O(3) Heisenberg ferromagnet is systematically analyzed starting from the effective Lagrangian. It is shown that the random phase approximation and the Callen approximation can be understood in terms of perturbation theory for type B magnons. Also, the second order approximation of Kondo and Yamaji for one dimensional ferromagnet is reduced to the perturbation theory for type A magnons. An emphasis is put on the physical picture, i.e. on magnon–magnon interactions and symmetries of the Heisenberg model. Calculations demonstrate that all three approximations differ in manner in which themore » magnon–magnon interactions arising from the Wess–Zumino term are treated, from where specific features and limitations of each of them can be deduced.« less
  • We present the perturbation theory for lattice magnon fields of the D-dimensional O(3) Heisenberg ferromagnet. The effective Hamiltonian for the lattice magnon fields is obtained starting from the effective Lagrangian, with two dominant contributions that describe magnon–magnon interactions identified as a usual gradient term for the unit vector field and a part originating in the Wess–Zumino–Witten term of the effective Lagrangian. Feynman diagrams for lattice scalar fields with derivative couplings are introduced, on the basis of which we investigate the influence of magnon–magnon interactions on magnon self-energy and ferromagnet free energy. We also comment appearance of spurious terms in low-temperaturemore » series for the free energy by examining magnon–magnon interactions and internal symmetry of the effective Hamiltonian (Lagrangian). -- Highlights: •Lattice magnon Hamiltonian constructed from the effective Lagrangian. •New Feynman diagrams with colored propagators and vertices for lattice scalar fields. •Influence of magnon–magnon interactions from the WZW term on magnon energies and free energy of O(3) HFM.« less