FIELD DEPENDENCE OF THE SPIN WAVE ENERGY IN RARE-EARTH METALS

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-238-C1-240 ◽  
Author(s):  
P. A. LINDGÅRD
Keyword(s):  
Rare Earth ◽  
Spin Wave ◽  
Field Dependence ◽  
Wave Energy ◽  
Rare Earth Metals

The Spin-Wave Theory of Electron and s-f-Exchange Magnetostriction in the Rare Earth Metals

1983 ◽  
Vol 120 (1) ◽  
pp. 383-395
Author(s):  
A. F. Sadreev ◽  
I. S. Sandalov ◽  
A. N. Podmarkov
Keyword(s):  
Rare Earth ◽  
Spin Wave ◽  
Rare Earth Metals ◽  
Wave Theory ◽  
Spin Wave Theory ◽  
The Rare Earth

scholarly journals Theory of Spin Waves in the Heavy Rare Earth Metals

1971 ◽  
Vol 49 (9) ◽  
pp. 1137-1161 ◽  
Author(s):  
D. A. Goodings ◽  
B. W. Southern
Keyword(s):  
Rare Earth ◽  
Spin Wave ◽  
Equations Of Motion ◽  
Rare Earth Metals ◽  
Spin Waves ◽  
Random Phase ◽  
Wave Interaction ◽  
Exchange Interactions ◽  
Special Cases ◽  
Anisotropic Exchange

A theory of spin waves for the spin structures found in the rare earth metals of h.c.p. crystal structure is described. The theory is developed for the conical spiral spin structure which contains the planar spiral, the nonplanar ferromagnet, and the planar ferromagnet as special cases. Included in the Hamiltonian are isotropic and anisotropic exchange interactions, single-ion crystal field terms, and magnetoelastic terms, both of the single-ion type (linear in the strains and up to fourth order in the spin operators) and of the two-ion type (linear in the strains and second order in the spin operators). The magnetoelastic effects are discussed in considerable detail, both in the "frozen lattice approximation" and in the opposite limit in which the strains closely follow the motion of the (uniformly) processing spins. Equations of motion for the spin operators are linearized with the help of the random phase approximation which makes it possible to express some spin-wave interaction effects in terms of powers of the reduced magnetization. Expressions for the spin-wave energies are given for the planar spiral, the nonplanar ferromagnet, and the planar ferromagnet, taking advantage of the simplifying features in each case.

Image of the Fermi Surface in Spin-Wave Spectra of Rare-Earth Metals

1961 ◽  
Vol 123 (3) ◽  
pp. 796-799 ◽  
Author(s):  
Edwin J. Woll ◽  
Stephen J. Nettel
Keyword(s):  
Rare Earth ◽  
Fermi Surface ◽  
Spin Wave ◽  
Rare Earth Metals ◽  
Wave Spectra

Microwave absorption phenomena in rare earth metals

1967 ◽  
Vol 300 (1463) ◽  
pp. 497-518 ◽  
Keyword(s):  
Rare Earth ◽  
Single Crystals ◽  
Microwave Absorption ◽  
Normal Mode ◽  
Spin Wave ◽  
Critical Field ◽  
Rare Earth Metals ◽  
Additional Absorption ◽  
Spin Configuration ◽  
Wave Approximation

Microwave absorption phenomena have been observed in single crystals of the rare-earth metals Tb, Dy, Ho and Er, at frequencies of 9.44 and 35.3 Gc/s in the temperature range 10 to 290 °K. All of these metals show microwave absorption at the critical field transitions. In Tb and Dy, additional absorption lines have been observed which are associated with the ferromagnetic spin configuration. The microwave results are discussed in terms of the normal mode frequencies derived on the basis of the spin wave approximation.

Magnetic susceptibility of liquid heavy rare earth metals

1979 ◽  
Vol 40 (C5) ◽  
pp. C5-260-C5-261 ◽  
Author(s):  
M. Müller ◽  
E. Huber ◽  
H.-J. Güntherodt
Keyword(s):  
Magnetic Susceptibility ◽  
Rare Earth ◽  
Rare Earth Metals ◽  
Heavy Rare Earth
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