Work

Diversity of ultrafast spin dynamics near the tricritical point in a ferrimagnetic Gd/FeCo multilayer

Year: 2024

Type: article

Abstract: It is found that subtle changes in the external magnetic field and temperature result in dramatic changes in the ultrafast response of spins to a femtosecond laser excitation in a ferrimagnetic Gd/FeCo multilayer. A total of six distinct types of spin dynamics were observed and explained by considering the spin-flop transition to the noncollinear phase and the concept of a tricritical point in the $H\text{\ensuremath{-}}T$ phase diagram. A particularly interesting type of dynamics is the exchange-driven reversal. These exchange-driven dynamics provide insights into the tricritical point, which is shown to separate two thermodynamically distinct noncollinear phases with the transition-metal magnetization pointing on adjacent sides of the anisotropy plane.

Source: Physical review. B./Physical review. B

DOI: 10.1103/physrevb.110.l140404

Authors: T. G. H. Blank, B. D. Muis, T. Lichtenberg, B. Koopmans, A. V. Kimel

Institutions: Radboud University Nijmegen, Eindhoven University of Technology, Delft University of Technology

Language: English

Topic: Magnetic properties of thin films

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Ministerie van Onderwijs, Cultuur en Wetenschap, European Research Council

Award: G2157310207