SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 25: Poster Session II: Surface magnetism II
O 25.3: Poster
Montag, 1. März 2021, 13:30–15:30, P
Magnetic force microscopy on a cobalt thin film deposited on a trampoline-type free hanging silicon nitride membrane — •Denis Goman1, Dhavalkumar Mungpara1, Federico Maspero2, Simone Cuccurullo3, Riccardo Bertacco2,3, and Alexander Schwarz1 — 1Institute of Nanostructure and Solid State Physics, University of Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany — 2CNR Istituto di Fotonica e Nanotecnologie, Piazza Leonardo da Vinci 32, 20133, Milano, Italy — 3CNR Istituto di Fotonica e Nanotecnologie, Piazza Leonardo da Vinci 32, 20133, Milano, Italy
We apply magnetic force microscopy (MFM) in ambient conditions employing the lift mode to study the magnetic domain structure of a 130 nm thick cobalt film deposited on a 1000 nm thick silicon nitride trampoline-type membrane attached to a 0.2 mm thick silicon frame. The cobalt is deposited only onto the central rectangular part of the trampoline membrane. The four strings attached to the corners of the the 0.15 mm × 0.15 mm window are uncoated.
MFM images show that the cobalt thin film exhibit out-of-plane stripe domains predominantly aligned along the sides of the rectangular shaped film. We find a periodicity of 230 nm in the central part where the film thickness is constant. At the edges, where the film thickness decreases linearly, the domain width decreases as well. We also studied the effect of an external magnetic field on the genuine domain structure.
The authors gratefully acknowledge funding from the ERC H2020 research and innovation program grant agreement No 828784.