Magnetic Excitations in a Metallic Antiferromagnet FePt_3

概要

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Spin waves in an antiferromagxtetic ordered alloy FePt3 have been investigatedixa a wide range of temperature by meauas of neutron imaelastic scatteri?tg techuaiques.From the dispersion relations of the spin waves at 5 K, the exchav?ge interactionparameters between Fe atoms were determiuted based on the localized spin model,which were foutvd to extend in long range with an oscillatory character, However,a renormajized spin wave theory with these parameters fails to reproduce theobserved temperature dependence of the sublattice magnetization as well as therenormaljzation of the spiua wave euaergy. This fact, together with the relativelylarge damping of the spin waves, suggests that the simple localized spin model isnot sufficietat to describe the spin dynamics in the alloy.
社団法人日本物理学会の論文
1980-09-15