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O: Fachverband Oberflächenphysik

O 93: Surface Magnetism (joint session MA/O)

O 93.2: Vortrag

Donnerstag, 19. März 2020, 10:00–10:15, HSZ 101

Dead magnetic layer at the interface - magnetic moment quenching in Mn on W(001) — •Sebastian Meyer¹, Martin Schmitt², Matthias Vogt², Matthias Bode², and Stefan Heinze¹ — ¹Institute for Theoretical Physics and Astrophysics, Christian-Albrechts University of Kiel, 24098 Kiel — ²Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, 97074 Würzburg

The magnetic moment of transition metals can vary strongly due to orbital bonding interactions with ligands, hybridization, or band structure changes induced by reduced coordination, often resulting in high spin–low spin transitions [1]. In contrast, the complete quenching of the magnetic moment, a so-called "dead magnetic layer", has not yet been observed [2]. Using density functional theory in combination with spin-polarized scanning tunneling microscopy, we show that the surface of a Mn double layer on W(001) exhibits a two-dimensional c(2×2) antiferromagnetic ground state. This result can only be confirmed by a complete moment quenching in the interfacial Mn layer caused by the combined action of hybridization and magnetic frustration.
[1] J. L. Fry, et. al., Phys. Rev. B 36, 868 (1987)
[2] C. A. F. Vaz, et. al., Rep. Prog. Phys. 71, 056501 (2008)