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Persistent nonequilibrium dynamics of the thermal energies in the spin and phonon systems of an antiferromagnet
A von Reppert1, J Pudell1, A Koc2
1Institut für Physik and Astronomie, Universität Potsdam , Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany.
Abstract:
We present a temperature and fluence dependent Ultrafast X-Ray Diffraction study of a laser-heated antiferromagnetic dysprosium thin film. The loss of antiferromagnetic order is evidenced by a pronounced lattice contraction. We devise a method to determine the energy flow between the phonon and spin system from calibrated Bragg peak positions in thermal equilibrium. Reestablishing the magnetic order is much slower than the cooling of the lattice, especially around the Néel temperature. Despite the pronounced magnetostriction, the transfer of energy from the spin system to the phonons in Dy is slow after the spin-order is lost.
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