Spin-wave theory of layered Heisenberg ferrimagnets

Wei, Guozhu; Qiu, Rong-ke; Du, An

doi:10.1016/0375-9601(95)00560-p

Cited by 18 publications

(21 citation statements)

References 13 publications

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“…). This result is in a general agreement with the result of [18], which yields the corresponding coefficient to be 9.937 for a simple cubic ferrimagnet with the same values of the effective spins. (It is not clear how the estimate of ca.…”

Section: Magnetic Properties Of Fe(tcne) 2 V(tcne) 2 As Interpreted Wsupporting

confidence: 88%

“…Thus, the observed ferromagnetic sign of the interlayer interaction appears as a result of ferromagnetic contributions Eq. (18). Such contributions depend qualitatively on the possibility to take advantage of the intrashell ferromagnetic interactions which in their turn depend on the occupancies of the atomic orbitals in the d-shells of the interacting transition metal cations.…”

Section: Relative Exchange Paramaters For V(tcne) 2 and Fe(tcne) 2 Comentioning

confidence: 97%

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Crystal and electronic structure of the room temperature organometallic ferrimagnet V(TCNE)₂. Analysis of numerical DoS and magnetic properties as related to orbital and spin‐Hamiltonian models

Tchougréeff¹,

Dronskowski²

2011

Int J of Quantum Chemistry

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ABSTRACT:We present a detailed analysis of the results of our numerical study of the crystal and electronic structure of the room temperature organometallic ferrimagnet of general composition V(TCNE) x with x ≈ 2. The results of the LSDA+U study show that the experimentally determined structure complies with the magnetic measurements and thus can serve as a prototype structure for the entire family of the M(TCNE) 2 organometallic magnets. The results of the numerical study and of the magnetic experiments are interpreted using a spin-wave treatment of the model Hamiltonians proposed here. This allowed us to obtain estimates of the critical temperature in three-and two-dimensional regimes and to give an explanation of the differences in behavior of probably isostructural V(TCNE) 2 and Fe(TCNE) 2 species.

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Section: Magnetic Properties Of Fe(tcne) 2 V(tcne) 2 As Interpreted Wsupporting

confidence: 88%

Section: Relative Exchange Paramaters For V(tcne) 2 and Fe(tcne) 2 Comentioning

confidence: 97%

Crystal and electronic structure of the room temperature organometallic ferrimagnet V(TCNE)₂. Analysis of numerical DoS and magnetic properties as related to orbital and spin‐Hamiltonian models

Tchougréeff¹,

Dronskowski²

2011

Int J of Quantum Chemistry

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“…It is very interesting to evaluate the action of the symmetry on the magnetic properties of the superlattices. However, little attention has been paid on this topics, since most of the systems investigated theoretically were superlattices with two kinds of materials or two-layer systems [14][15][16][17][18][19][20][21][22][23][24]. In laboratories, artificial multilayer/superlattice material is realizable, which can exhibit new physical properties.…”

Section: Introductionmentioning

confidence: 99%

“…and their dynamical behaviours [28]. As known, the linear spin-wave approach is appropriate only to the region of zero temperature or low temperatures [15]. At high temperatures, this approach is insufficient and some kinds of self-consistent treatment [29,30] or spin Green's function method [31] are necessary.…”

Section: Introductionmentioning

confidence: 99%

Quantum fluctuation and the magnetically structural symmetry in ferrimagnetic superlattices

Qiu

Zhang

2007

Physica Status Solidi (b)

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The magnetization and the quantum fluctuations in several ferrimagnetic superlattices consisting of 2 -6 different magnetic sublayers are studied by employing Holstein -Primakoff transformations and Green's functions technique only for zero temperature. Investigating ferrimagnetic superlattices with different magnetic sublayers and different spin configurations, we find that when some of spin quantum numbers are adjusted, some sublayer magnetizations at zero-temperature exhibit a minimum, correspondingly, the quantum fluctuation of the system exhibits a maximum point. Different spin configurations have different quantum fluctuations of the system. The maximum point of the quantum fluctuation of the system is related with higher symmetry of the system. It differs from the symmetry of crystallographic point-groups or space-groups, but belongs to the type III Shubnikou group of magnetic group, which describes antiferromagnetic or ferrimagnetic state. We define it as the magnetically structural symmetry. The higher the magnetically structural symmetry of the system is, the stronger the quantum fluctuation of the system is, for varying spin quantum numbers and different spin configurations.

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“…Therefore, we shall use the quantum linear spin-wave method. However, the linear spin-wave approach is appropriate only to the region of zero temperature or low temperatures [32]. At high temperatures, this approach is insufficient and some kinds of selfconsistent treatment [33,34] or spin Green's function method [20,35] are necessary.…”

Section: Introductionmentioning

confidence: 99%

Magnon energy gap in a three‐layer ferromagnetic superlattice

Qiu

Zhang

Han

et al. 2007

Physica Status Solidi (b)

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The magnon energy band in a three-layer ferromagnetic superlattice is studied by using the linear spinwave approach and Green's function technique. It is found that two modulated energy gaps exist in the magnon energy band along K x direction perpendicular to the plane of the superlattice. The spin quantum numbers and the interlayer exchange couplings all affect the two energy gaps. The disappearance of one of the energy gaps corresponds to a high symmetry among the interlayer exchange couplings, while the vanishing of another energy gap corresponds to a high symmetry of the system, which belongs to the type III Shubnikov group or the polychromatic group of magnetic group. This magnetically structural symmetry includes not only the symmetry of crystallographic point-groups or space-groups, but also the symmetry of strength and direction of spins. Comparing with the previous results for a three-layer ferrimagnetic superlattice, it is concluded that the energy gap of the ferromagnetic/ferrimagnetic superlattices is dominated by different symmetries originated from ferromagnetic/antiferromagnetic interlayer exchange couplings.

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Spin-wave theory of layered Heisenberg ferrimagnets

Cited by 18 publications

References 13 publications

Crystal and electronic structure of the room temperature organometallic ferrimagnet V(TCNE)₂. Analysis of numerical DoS and magnetic properties as related to orbital and spin‐Hamiltonian models

Crystal and electronic structure of the room temperature organometallic ferrimagnet V(TCNE)₂. Analysis of numerical DoS and magnetic properties as related to orbital and spin‐Hamiltonian models

Quantum fluctuation and the magnetically structural symmetry in ferrimagnetic superlattices

Magnon energy gap in a three‐layer ferromagnetic superlattice

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Spin-wave theory of layered Heisenberg ferrimagnets

Cited by 18 publications

References 13 publications

Crystal and electronic structure of the room temperature organometallic ferrimagnet V(TCNE)2. Analysis of numerical DoS and magnetic properties as related to orbital and spin‐Hamiltonian models

Crystal and electronic structure of the room temperature organometallic ferrimagnet V(TCNE)2. Analysis of numerical DoS and magnetic properties as related to orbital and spin‐Hamiltonian models

Quantum fluctuation and the magnetically structural symmetry in ferrimagnetic superlattices

Magnon energy gap in a three‐layer ferromagnetic superlattice

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Product

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About

Crystal and electronic structure of the room temperature organometallic ferrimagnet V(TCNE)₂. Analysis of numerical DoS and magnetic properties as related to orbital and spin‐Hamiltonian models

Crystal and electronic structure of the room temperature organometallic ferrimagnet V(TCNE)₂. Analysis of numerical DoS and magnetic properties as related to orbital and spin‐Hamiltonian models