Regensburg 2016 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 26: Poster session II
MM 26.41: Poster
Dienstag, 8. März 2016, 18:30–20:30, Poster B3
Nonequilibrium Dynamics of the spin system and lattice heat in the rare earth Dysprosium — •Alexander von Reppert1, Jan Pudell1, Karine Dumesnil2, Flavio Zamponi1, and Matias Bargheer1,3 — 1Institut für Physik und Astronomie, Potsdam, Germany — 2Institut Jean Lamour, Vandoeuvre les Nancy cédex, France — 3Helmholtz Zentrum Berlin, Berlin, Germany
We present a temperature and fluence dependent Ultrafast X-Ray Diffraction study of a laser-heated Dysprosium thin film. A pronounced lattice contraction heralds the ultrafast loss of antiferromagnetic order, which is reestablished on a nanosecond timescale when the heat reservoir of the phonons in Dy has cooled well below the Néel temperature. The calibration of the position and width of the Bragg peaks in thermal equilibrium allows for a detailed experimental measurement of the energy deposited in the lattice and spin system. Reestablishing the magnetic order by cooling of the magnetic system is much slower than cooling the lattice, especially around the Néel temperature. Although the system shows very strong magnetostriction, the transfer of energy from the spin system to the lattice is weak after the spin-order is lost.