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MA: Fachverband Magnetismus
MA 3: Ultrafast Magnetization Effects I
MA 3.11: Vortrag
Montag, 18. März 2024, 12:30–12:45, H 2013
Ultrafast dynamics of phase transitions in hematite — •Maik Kerstingskötter1, Tobias Dannegger1, András Deák2, Levente Rózsa3, László Szunyogh2, and Ulrich Nowak1 — 1Department of Physics, University of Konstanz — 2Department of Theoretical Physics, Budapest University of Technology and Economics — 3HUN-REN Wigner Research Centre for Physics, Budapest
The iron oxide hematite is well suited for many spintronic applications and long-distance spin transport due to its insulating and antiferromagnetic properties and its low damping constant. In addition, hematite undergoes a low-temperature first-order phase transition called the Morin transition, leading to an abrupt 90∘ spin reorientation associated with a transition from a fully antiferromagnetic to a canted state with weak net magnetization. We simulate the nonequilibrium spin dynamics of this phase transition in response to sudden temperature and field variations with femtosecond resolution using atomistic spin dynamics simulations based on ab initio parameters [1].
[1] T. Dannegger et al., “Magnetic properties of hematite revealed by an ab initio parameterized spin model”, Phys. Rev. B, 107, 184426 (2023).
Keywords: nonequilibrium; antiferromagnetism; weak ferromagnetism; phase transition