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Persistent URL http://purl.org/net/epubs/work/655
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Record Id 655
Title The spectrum of longitudinal spin fluctuations in a ferromagnet including dipolar and Zeeman energies
Abstract The spectrum of longitudinal spin fluctuations, observed in inelastic neutron scattering experiments, is provided for a Heisenberg model of an ordered ferromagnet, including dipolar forces and a magnetic field. A numelical method is used to obtain results, from an expression delived with linear spin-wave theory, for wave vectors (k) throughout the Brillouin zone as a function of/requency (w), and at various temperatures. Pruticular attention is given to realistic models of EuO and EuS. Results show that dipolar forces diminish the intensity in the longitudinal response function S (k,w) by about a factor of 2, in accord with previous results for the isothermal susceptibility. The evolution of S(k,w) with k displays several pronounced features, and for EuS there is a strong dependence on the direction of k fork near the zone boundary.
Organisation ISIS , ISIS-THEORY , SERC
Keywords Physics , ISIS 1993 (RAL Report) , ISIS 1993
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Language English (EN)
Type Details URI(s) Local file(s) Year
Journal Article J Phys-Condens Mat 5 (1993): 1109. doi:10.1088/0953-8984/5/8/012 1993
Report RAL Technical Reports RAL-93-004. 1993. RAL-TR-1993-004.pdf 1993