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...

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Bibliographic Details
Published in:Structural dynamics (Melville, N.Y.) N.Y.), 2016-09, Vol.3 (5), p.054302-054302
Main Authors: von Reppert, A., Pudell, J., Koc, A., Reinhardt, M., Leitenberger, W., Dumesnil, K., Zamponi, F., Bargheer, M.
Format: Article
Language:English
Subjects:
Antiferromagnetism
Approximation
Bragg curve
Dysprosium
Energy
Energy flow
Equilibrium
Fluence
Heat
Laser beam heating
Magnetic thin films
Magnetostriction
Neel temperature
Phase transitions
Phonons
Temperature
Temperature dependence
Thin films
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Summary: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.
ISSN:2329-7778
2329-7778
DOI:10.1063/1.4961253