Exchange interactions and basal-plane magnetocrystalline anisotropy in R2Co17 intermetallics

1985 ◽  
Vol 51 (1-3) ◽  
pp. 175-182 ◽  
Author(s):  
R.J. Radwanski ◽  
J.J.M. Franse ◽  
S. Sinnema
Keyword(s):  
Basal Plane ◽  
Magnetocrystalline Anisotropy ◽  
Exchange Interactions

scholarly journals Isotropic Nature of the Metallic Kagome Ferromagnet Fe3Sn2 at High Temperatures

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 307
Author(s):  
Rebecca L. Dally ◽  
Daniel Phelan ◽  
Nicholas Bishop ◽  
Nirmal J. Ghimire ◽  
Jeffrey W. Lynn
Keyword(s):  
Elevated Temperatures ◽  
Magnetocrystalline Anisotropy ◽  
Inelastic Neutron Scattering ◽  
Exchange Interactions ◽  
Inelastic Neutron ◽  
Temperature Threshold ◽  
Magnetic Exchange ◽  
Spatial Anisotropy ◽  
Isotropic Exchange ◽  
State Spin

Anisotropy and competing exchange interactions have emerged as two central ingredients needed for centrosymmetric materials to exhibit topological spin textures. Fe3Sn2 is thought to have these ingredients as well, as it has recently been discovered to host room temperature skyrmionic bubbles with an accompanying topological Hall effect. We present small-angle inelastic neutron scattering measurements that unambiguously show that Fe3Sn2 is an isotropic ferromagnet below TC≈660 K to at least 480 K—the lower temperature threshold of our experimental configuration. Fe3Sn2 is known to have competing magnetic exchange interactions, correlated electron behavior, weak magnetocrystalline anisotropy, and lattice (spatial) anisotropy; all of these features are thought to play a role in stabilizing skyrmions in centrosymmetric systems. Our results reveal that at the elevated temperatures measured, there is an absence of significant magnetocrystalline anisotropy and that the system behaves as a nearly ideal isotropic exchange interaction ferromagnet, with a spin stiffness D(T=480 K)=168 meV Å2, which extrapolates to a ground state spin stiffness D(T=0 K)=231 meV Å2.

Magnetic properties of DyFe5−Co Al7: Suppression of exchange interactions and magnetocrystalline anisotropy by Co substitution

2018 ◽  
Vol 741 ◽  
pp. 715-722 ◽  
Author(s):  
D.I. Gorbunov ◽  
A.V. Andreev ◽  
D.S. Neznakhin ◽  
M.S. Henriques ◽  
J. Šebek ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetocrystalline Anisotropy ◽  
Exchange Interactions ◽  
Co Substitution

Phase Transitions in Hoalga

1983 ◽  
Vol 21 ◽  
Author(s):  
M. Doukoure ◽  
D. Gignoux ◽  
F. Sayetat
Keyword(s):  
Thermal Expansion ◽  
Room Temperature ◽  
Magnetic Order ◽  
Magnetocrystalline Anisotropy ◽  
Exchange Interactions ◽  
Thermal Anomaly ◽  
Antiferromagnetic State ◽  
Hexagonal Symmetry ◽  
X Ray ◽  
Magnetic Structures

ABSTRACTHoAlGa is hexagonal at room temperature. It undergoes two magnetic transitions succesively at TN = 32 K from a paramagnetic to a triangular antiferromagnetic state where the Ho moments lie in the basal plane and at Tt = 18 K in the course of which the moments rotate toward c giving rise to a colinear antiferromagnetic arrangement. X-ray experiments performed between 5 and 300 K allow to determine the crystal evolution through the two transitions. The hexagonal symmetry is not lowered through the transitions; this result is compatible with the observed magnetic groups. The thermal expansion curves show a very anisotropic behaviour of the lattice parameters. The “c” parameter shrinks below TN and this anomaly is to be related to the magnetic order. Along a, a positive thermal anomaly appears below 70 K and this can be interpreted by crystal field effects. Stability of magnetic structures is discussed with regard to exchange interactions and magnetocrystalline anisotropy.

Theory of spin waves in triangular antiferromagnets

1978 ◽  
Vol 56 (11) ◽  
pp. 1482-1487 ◽  
Author(s):  
J. A. Oyedele ◽  
M. F. Collins
Keyword(s):  
Spin Wave ◽  
Basal Plane ◽  
Exchange Interactions ◽  
Wave Theory ◽  
Wave Dispersion ◽  
One Dimensional ◽  
Dipole Interactions ◽  
Weak Exchange ◽  
Exchange Constants ◽  
Strong Exchange

A simple hexagonal array of classical spins coupled by nearest-neighbour antiferromagnetic Heisenberg interactions has a ground state with a triangular antiferromagnetic configuration of spins. We have developed spin wave theory for triangular antiferromagnets with both Heisenberg and dipole–dipole interactions. The dipole–dipole interactions confine the spins to the hexagonal basal plane and they do not distort the equiangular triangular structure. Spin wave dispersion relations are plotted for some trial values of the exchange constants. The theory is applied to the triangular antiferromagnet CsMnBr3. This is a quasi-one-dimensional material with strong exchange interactions along the hexagonal axes and with weak exchange interactions within the basal plane that are of the same order as dipolar interactions.

scholarly journals Nature of magnetocrystalline anisotropy in the basal plane of iron borate

2017 ◽  
Vol 442 ◽  
pp. 417-422 ◽  
Author(s):  
Mark Strugatsky ◽  
Kira Seleznyova ◽  
Sergey Yagupov ◽  
Alexey Drovosekov ◽  
Janis Kliava
Keyword(s):  
Basal Plane ◽  
Magnetocrystalline Anisotropy ◽  
Iron Borate

scholarly journals Exchange Interactions and Curie Temperature of Ce-Substituted SmCo5

2019 ◽  
Vol 4 (1) ◽  
pp. 11 ◽  
Author(s):  
Soyoung Jekal
Keyword(s):  
Curie Temperature ◽  
Magnetocrystalline Anisotropy ◽  
Mean Field ◽  
Exchange Interactions ◽  
Field Approximation ◽  
Exchange Energy ◽  
Mean Field Approximation ◽  
Partial Substitution ◽  
Magnetic Devices ◽  
Ferromagnetic Exchange

A partial substitution such as Ce in SmCo 5 could be a brilliant way to improve the magnetic performance, because it will introduce strain in the structure and breaks the lattice symmetry in a way that enhances the contribution of the Co atoms to magnetocrystalline anisotropy. However, Ce substitutions, which are benefit to improve the magnetocrystalline anisotropy, are detrimental to enhance the Curie temperature ( T C ). With the requirements of wide operating temperature range of magnetic devices, it is important to quantitatively explore the relationship between the T C and ferromagnetic exchange energy. In this paper we show, based on mean-field approximation, artificial tensile strain in SmCo 5 induced by substitution leads to enhanced effective ferromagnetic exchange energy and T C , even though Ce atom itself reduces T C .

Magnetocrystalline anisotropy and exchange interactions in the novel R3(Fe, V)29 compounds (R  Y, Nd, Sm)

1996 ◽  
Vol 240 (1-2) ◽  
pp. 101-106 ◽  
Author(s):  
Ye.V. Shcherbakova ◽  
G.V. Ivanova ◽  
M.I. Bartashevich ◽  
V.I. Khrabrov ◽  
Ye.V. Belozerov
Keyword(s):  
Magnetocrystalline Anisotropy ◽  
Exchange Interactions ◽  
The Novel
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