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MA: Fachverband Magnetismus

MA 9: Cooperative Phenomena: Spin Structures and Magnetic Phase Transitions

MA 9.11: Talk

Monday, March 27, 2023, 17:45–18:00, HSZ 401

Experimental exploration of criticality in dynamic magnetic phase transitions — •Mikel Quintana and Andreas Berger — CIC nanoGUNE BRTA, E-20018 Donostia-San Sebastián, Spain.

The dynamic phase transition (DPT) of ferromagnets is a well-known phenomenon describing an abrupt change in the time-evolution behavior of magnetization in the presence of a time-dependent magnetic field. Its similarities with the conventional thermodynamic phase transition (TPT), particularly in terms of scaling behavior close to their respective critical points, are of utmost importance to understand collective behaviors in systems out-of-equilibrium [1]. However, a lack of experimental verification of these theoretical predictions has impeded further progress in the field up to now. Here, we experimentally explore for the first time the scaling behavior and critical exponents of the DPT in ultrathin Co films by means of real-time magneto-optical Kerr effect measurements in the relevant dynamic phase space. Surprisingly, we observe that the DPT and TPT critical exponents correspond to different dimensionalities for the same film. Our results seem to indicate different dimensional crossover length-scales for the TPT and DPT, a fact that has not been explored to date. [1] P. Riego et. al., Physica B 549, 13-23 (2018).