Open AccessA STUDY OF SPIN WAVE IN Fe3Si AT LOW TEMPERATURE
Author(s) -
Tony Fang,
Yan Qi-Wei,
Shen Zhi-Gong,
P. von Blanckenhagen,
Hong Lin,
Quan Lin
Publication year - 1987
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.36.570
Subject(s) - spin wave , physics , dispersion relation , condensed matter physics , constant (computer programming) , spin (aerodynamics) , dispersion (optics) , inelastic neutron scattering , magnetization , quadratic equation , scattering , inelastic scattering , quantum mechanics , ferromagnetism , thermodynamics , mathematics , magnetic field , geometry , computer science , programming language
The dispersion relation of spin wave in Fe3Si at 14 K has been measured by inelastic coherent neutron scattering. The spin wave stiffness constant D0, which is obtained experimentally from quadratic dispersion of spin wave, equals 270 meV ?2. A calculation of effective exchange integral Jeff has been done in the frame of Heisenberg model. From the temperature dependence of magnetization, a spin wave stiffness constant Dm(0) can be derived also. There is an indication of the existence of Stoner excitations from a comparison of D0 and Dm(0). The temperature dependence of spin wave stiffness constant is also gaven.