Simple spin-wave theory, based to a first approximation on Heisenberg exchange, often gives a qualitative description of the dynamics of many magnetic systems. However, as we examine more complex materials we find that higher-order interactions are often important, and can change dramatically the dynamics.
CACIUFFO Roberto;
LANDER G.H.;
SANTINI P.;
CARRETTA S.;
AMORETTI G.;
HIESS A.;
MAGNANI Nicola;
REGNAULT L.P.;
2012-10-19
Institut Laue-Langevin (ILL)
JRC68954
http://www.ill.eu/nc/quick-links/news/news-single-view/tous/2012/05/article/6622/annual-report-1/,
https://publications.jrc.ec.europa.eu/repository/handle/JRC68954,
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