Spin waves in paramagnetic BCC iron: spin dynamics simulations

Abstract

Large scale computer simulations are used to elucidate a longstanding controversy regarding the existence, or otherwise, of spin waves in paramagnetic BCC iron. Spin dynamics simulations of the dynamic structure factor of a Heisenberg model of Fe with first principles interactions reveal that well defined peaks persist far above Curie temperature T_c. At large wave vectors these peaks can be ascribed to propagating spin waves, at small wave vectors the peaks correspond to over-damped spin waves. Paradoxically, spin wave excitations exist despite only limited magnetic short-range order at and above T_c.

Submitted to PRL

References in corpus (2)

• Fast spin dynamics algorithms for classical spin systems
• Spin dynamics simulations of the magnetic dynamics of RbMnF${}_3$ and direct comparison with experiment

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