Persistent nonequilibrium dynamics of the thermal energies in the spin and phonon systems of an antiferromagnet.
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.
Institut für Physik and Astronomie, Universität Potsdam , Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany.
A
A
von Reppert
Institut für Physik and Astronomie, Universität Potsdam , Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany.
J
J
Pudell
Helmholtz Zentrum Berlin , Albert-Einstein-Str. 15, 12489 Berlin, Germany.
A
A
Koc
Helmholtz Zentrum Berlin , Albert-Einstein-Str. 15, 12489 Berlin, Germany.
M
M
Reinhardt
Institut für Physik and Astronomie, Universität Potsdam , Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany.
W
W
Leitenberger
Institut Jean Lamour (UMR CNRS 7198), Université Lorraine , Boulevard des Aiguillettes B.P. 239, F-54500 Vandoeuvre les Nancy Cédex, France.
K
K
Dumesnil
Institut für Physik and Astronomie, Universität Potsdam , Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany.
F
F
Zamponi
M
M
Bargheer
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