Low-temperature behavior of the spin-wave energy in the itinerant electron model of ferromagnetism

1972 ◽  
Vol 8 (5-6) ◽  
pp. 463-477 ◽  
Author(s):  
M. Corrias ◽  
F. de Pasquale
Keyword(s):  
Low Temperature ◽  
Spin Wave ◽  
Wave Energy ◽  
Temperature Behavior ◽  
Itinerant Electron ◽  
Electron Model

The temperature dependence of the spin wave energy in the itinerant electron model of ferromagnetism

1968 ◽  
Vol 302 (1470) ◽  
pp. 409-418 ◽  
Keyword(s):  
Spin Wave ◽  
Wave Energy ◽  
Short Range ◽  
Distribution Functions ◽  
Itinerant Electron ◽  
Short Range Interaction ◽  
Range Interaction ◽  
Electron Model ◽  
Long Wavelength ◽  
Chemical Potentials

The long wavelength non-interacting spin wave energy for metals at low temperatures is expressed as ћω q = Dq 2 = ( D 0 + D 1 T 2 ) q 2 . The dependence of the coefficient D 1 on the density of states function, the number of electrons per atom, n , and the effective short range interaction energy, I , is discussed. The variation of D with T 2 comes from the change with temperature of the relative occupation ζ and the chemical potentials of the ± spin sub-bands as well as from the direct asymptotic expansion of the Fermi distribution functions occurring in the expression for D .

Spin wave resonance in iron

1966 ◽  
Vol 292 (1429) ◽  
pp. 224-239 ◽  
Keyword(s):  
Spin Wave ◽  
Wave Interaction ◽  
Growth Conditions ◽  
Itinerant Electron ◽  
Coupling Constant ◽  
Iron Films ◽  
Electron Model ◽  
Spin Wave Resonance ◽  
Logarithmic Plot ◽  
Wave Resonance

The spin wave spectra obtained from thin films of the iron group metals are discussed, mainly with reference to the spectrum of iron. It is found that, under suitable growth conditions, specimens can be manufactured whose resonance absorption modes are very similar to those predicted by the simple model of spin wave resonance. Three iron films are examined whose thicknesses range from 1800 to 4200 Å and all give similar values for the spin wave coupling constant D . The constant D is examined as a function of temperature and is found to behave in a similar way to nickel and cubic cobalt, giving a 10 % variation of D between 20 and 300 °K. A logarithmic plot indicates that a T5/2 law is obeyed for most of the temperature range, but it is also possible to fit the points to a T 2 plot, in accord with the itinerant electron model, provided other power law terms are assumed present. These other terms might be the spin wave interaction T5/2 term or that due to the effect of thermal expansion. The linewidths observed in the iron resonances are discussed, and reasons based on the ineffectiveness of the two magnon scattering processes are put forward for these narrow lines ( ~ 37 Oe) as opposed to the much broader lines often found in ferromagnetic resonance.

Low-temperature behavior of polyurethane elastomers

1974 ◽  
Vol 18 (2) ◽  
pp. 401-418 ◽  
Author(s):  
Norman E. Rustad ◽  
Robert G. Krawiec
Keyword(s):  
Low Temperature ◽  
Temperature Behavior ◽  
Polyurethane Elastomers

Anomalous low-temperature behavior of PrT2B2C and

2004 ◽  
Vol 279 (1) ◽  
pp. 5-13 ◽  
Author(s):  
M El Massalami ◽  
H.A Borges ◽  
H Takeya ◽  
R.E Rapp ◽  
F.A.B Chaves
Keyword(s):  
Low Temperature ◽  
Temperature Behavior

Anomalous low-temperature behavior in Th2Zn17-type U2CuxAl17 − x

1998 ◽  
Vol 177-181 ◽  
pp. 451-452 ◽  
Author(s):  
T. Nishioka ◽  
K. Mizutani ◽  
S. Taniguchi ◽  
M. Kontani
Keyword(s):  
Low Temperature ◽  
Temperature Behavior
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