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Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Surface Magnetism

MA 19.2: Vortrag

Dienstag, 19. März 2024, 09:45–10:00, EB 407

The magnetic domain structure of Tb(0001)/W(110) — •Patrick Härtl, Markus Leisegang, and Matthias Bode — Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany

Rare earth metal films are known to exhibit an extremely rich magnetic behavior. In the first instance it depends on the element-specific sign and wavelength of the RKKY interaction, but details of the film preparation procedure have also been shown to influence the domain structure [1]. Here we report on an investigation of epitaxial Terbium (Tb) films on W(110) by means of spin-polarized scanning tunneling microscopy (SP-STM). Tb is a ferromagnetic metal with a Curie temperature of 221 K [2]. It exhibits a large magnetic anisotropy [3] attributed to its non-spherical 4f charge distribution arising from a large atomic orbital momentum (L=3). The easy magnetization axis is within the basal plane along ⟨1010⟩. Our investigation on Tb(0001) films grown on W(110) indeed shows a sixfold magnetic contrast, consistent with the expected in-plane orientation of magnetic domains and comparable to earlier studies of Dy(0001)/W(110) [4]. Thickness-dependent studies reveal that the magnetic domain sizes increases with increasing film thicknesses. Domain walls are identified as Néel walls with a width of 1.4−3.6 nm.
[1] P. Härtl et al., Phys. Rev. B 105, 174431 (2022).
[2] J. E. Prieto et al., Phys. Rev. B 94, 174445 (2016).
[3] J. J. Rhyne et al., J. Appl. Phys. 38, 1379 (1967).
[4] L. Berbil-Bautista et al., Phys. Rev. B 76, 064411 (2007).

Keywords: Domain walls; SP-STM; Tb(0001); Magnetism; Anisotropies

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