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MA: Magnetismus

MA 22: Magnetische dünne Schichten IV

MA 22.4: Vortrag

Dienstag, 8. März 2005, 11:15–11:30, TU H1012

Correlation of ferromagnetic resonance modes and domain structure in patterned ferromagnetic films — •ute queitsch¹, Jeffrey McCord¹, Rudolf Schäfer¹, Ludwig Schultz¹, Karsten Rott², and Hubert Brückl² — ¹Leibniz Institut für Festkörper- und Werkstoffforschung (IFW), Helmholtzstraße 20, 1069 Dresden — ²Universität Bielefeld, Lehrstuhl für Dünne Schichten und Nanostrukturen,Universitätsstrasse 25,33615 Bielefeld

Understanding the high frequency (hf) magnetic response of patterned soft magnetic thin films is crucial for hf applications, e.g. integrated micro-inductors. Arrays of single and bi-layer Ni₈₁Fe₁₉ and CoZrTa thin film elements (100 µm x 50 µm x 80 nm) were fabricated. The hf response was characterized by pulsed inductive microwave magnetometry (PIMM) and directly compared to the magnetic domain structure, analyzed by magneto-optical Kerr microscopy in the longitudinal mode. By varying the magnetic field history different virgin domain states were adjusted. Depending on the micromagnetic structure, characteristic changes in the hf response were observed. It was found that the presence of domains causes a drastic increase in the dominating ferromagnetic resonance frequency of the films due to an accompanied stiffening of its magnetization. With increasing domain density, a decrease in hf permeability for the same sample is observed. Domain wall effects during the dynamic remagnetization process lead to additional frequency modes in the sub-GHz range.