Thermodynamics of a helicoidal magnetic structure in a spin-wave approximation

2014 ◽  
Vol 115 (8) ◽  
pp. 737-743
Author(s):  
M. A. Borich ◽  
V. V. Smagin ◽  
A. P. Tankeyev
Keyword(s):  
Magnetic Structure ◽  
Spin Wave ◽  
Wave Approximation

scholarly journals Magnetic structure study of the sawtooth chain antiferromagnet $$\hbox {Fe}_2\hbox {Se}_2\hbox {O}_7$$

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kazuhiro Nawa ◽  
Maxim Avdeev ◽  
Peter Berdonosov ◽  
Alexey Sobolev ◽  
Igor Presniakov ◽  
...  
Keyword(s):  
Dispersion Relation ◽  
Neutron Diffraction ◽  
Magnetic Structure ◽  
Spin Wave ◽  
Magnetic Moments ◽  
Structure Study ◽  
Flat Band ◽  
Magnetization Measurements ◽  
Wave Approximation ◽  
Powder Neutron Diffraction

AbstractA magnetic structure of the sawtooth-chain antiferromagnet $$\hbox {Fe}_2\hbox {Se}_2\hbox {O}_7$$ Fe 2 Se 2 O 7 was investigated by magnetization measurements, single crystalline and powder neutron diffraction experiments, and a further analysis on the Mössbauer spectra. These experiments revealed a nearly collinear antiferromagnetic structure with magnetic moments aligned along the b-axis, indicating dominant antiferromagnetic exchanges between Fe(1)–Fe(2) and Fe(2)–Fe(3) sites. The magnon dispersion relation derived from the linear spin wave approximation suggests the possible flat band nature of magnons.

On the spin wave approximation

Physica ◽  
1966 ◽  
Vol 32 (6) ◽  
pp. 1019-1032 ◽  
Author(s):  
D.A. Pink ◽  
W. Opechowski
Keyword(s):  
Spin Wave ◽  
Wave Approximation

scholarly journals Spiral antiferromagnets beyond the spin-wave approximation: FrustratedXYand Heisenberg models on the honeycomb lattice

2014 ◽  
Vol 89 (9) ◽  
Author(s):  
Andrea Di Ciolo ◽  
Juan Carrasquilla ◽  
Federico Becca ◽  
Marcos Rigol ◽  
Victor Galitski
Keyword(s):  
Spin Wave ◽  
Honeycomb Lattice ◽  
Wave Approximation ◽  
Heisenberg Models

Magnon Excitation Spectrum in Ferromagnetic Quasicubic Manganites

2010 ◽  
Vol 46 (6) ◽  
pp. 1295-1298 ◽  
Author(s):  
P. Schlottmann
Keyword(s):  
Excitation Spectrum ◽  
Spin Wave ◽  
Heisenberg Model ◽  
Double Exchange ◽  
Zone Boundary ◽  
Wave Approximation ◽  
Hund’S Rule ◽  
Jahn Teller ◽  
Hund's Rule ◽  
Magnon Excitation

The magnon excitation spectrum of ferromagnetic quasicubic manganites is studied by using the linearized spin-wave approximation for the double-exchange and the superexchange interactions. Two situations are distinguished: 1) a rigid coupling of the t2gand egspins via a large Hund's rule coupling and 2) a softened coupling between these spins (e.g., due to coupling of the egelectrons to Jahn-Teller modes). Case 2) leads to a softening of the magnon dispersion (compared to the Heisenberg model) close to the zone boundary.

scholarly journals Особенности фокусировки спиновых волн в кристаллах EuO и EuS

2019 ◽  
Vol 61 (2) ◽  
pp. 257
Author(s):  
С.М. Бахарев ◽  
С.П. Савченко ◽  
А.П. Танкеев
Keyword(s):  
Exchange Interaction ◽  
Spin Wave ◽  
Lattice Constant ◽  
Brillouin Zone ◽  
Wave Vector ◽  
Magnetic Moment ◽  
Wave Focusing ◽  
Wave Approximation ◽  
Long Wave ◽  
Long Wave Approximation

AbstractSpecificities 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 $$ \gtrsim $$ 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.

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