Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 35: Magnetic Thin Films V
MA 35.8: Vortrag
Freitag, 31. März 2006, 12:30–12:45, HSZ 03
Thickness-dependent domain structure of ferromagnetic Dy(0001)/W(110) studied by spin-polarized STM — •Luis Berbil-Bautista, Stefan Krause, Matthias Bode, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg, Jungiusstraße 11, Hamburg
Below the Curie temperature TC = 85 K bulk dysprosium (Dy) is ferromagnetic with an easy direction along the ⟨ 2110⟩ directions, i.e. within basal (0001) planes. In this contribution we present a spin-polarized scanning tunneling microscopy (SP-STM) study on the growth and magnetic domain structure of flat epitaxial Dy films on W(110). At low thickness (coverage Θ ≤ 10 ML) patches with two different stackings can be found on the W(110) surface which exhibit a diameter of about 100 nm and which are separated by grain boundaries. With increasing thickness these grain boundaries become unstable and transform into double screw dislocations. Spin-resolved data reveal that the domain size and shape is strongly affected by both the thickness and the amount and type of defects on the Dy surface.