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MA: Fachverband Magnetismus

MA 43: Focus Session: Higher-Order Magnetic Interactions – Implications in 2D and 3D Magnetism I

MA 43.6: Vortrag

Donnerstag, 19. März 2020, 12:00–12:15, HSZ 04

Discovery of a triple-Q state in an ultrathin transition-metal film — Jonas Spethmann¹, Sebastian Meyer², Kirsten von Bergmann¹, Soumyajyoti Haldar², Jonas Sassmannshausen¹, •Stefan Heinze², Roland Wiesendanger¹, and André Kubetzka¹ — ¹Department of Physics, University of Hamburg, 20355 Hamburg, Germany — ²Institute of Theoretical Physics and Astrophysics, University of Kiel, 24098 Kiel, Germany

Higher-order exchange interactions have been proposed based on the Hubbard model [1-3]. These terms can stabilize intriguing magnetic ground states due to a superposition of spin spirals. A prominent example is the triple-Q state predicted for a Mn monolayer on Cu(111) [4]. Here, we experimentally verify the existence of two – previously predicted but so far unobserved – magnetic ground states in a Mn monolayer on the Re(0001) surface using spin-polarized scanning tunneling microscopy. For fcc stacking of Mn the row-wise antiferromagnetic state occurs, while for hcp-Mn a superposition of three row-wise antiferromagnetic states, the triple-Q state, appears. Density functional theory calculations elucidate the subtle interplay of different magnetic interactions to form these spin structures and provide insight into the role played by relativistic effects.
[1] M. Takahashi, J. Phys. C Solid State Phys. 10, 1289 (1977)
[2] A. H. MacDonald et al., Phys. Rev. B 37, 9753 (1988)
[3] M. Hoffmann and S. Blügel, arXiv:1803.01315 (2018)
[4] P. Kurz et al., Phys. Rev. Lett. 86, 1106 (2001).