Dresden 2011 – wissenschaftliches Programm
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KR: Fachgruppe Kristallographie
KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)
KR 5.85: Poster
Dienstag, 15. März 2011, 10:45–13:00, P2
Magneto-dynamic properties of CoFeB thin film elements: The role of magnetic domain walls — Claudia Patschureck1, •Jeffrey McCord2, Rudolf Schäfer1, Kilian Lenz2, Roland Mattheis3, and Ludwig Schultz1,4 — 1Insitute for Solid State and Materials Research IFW Dresden, Germany — 2Insitute of Ion Beam Physics and Materials Research, Forschungszentrum Dresden-Rossendorf, Dresden, Germany — 3Institute for photonic technologies (IPHT), Jena, Germany — 4Dresden University of Technology, Dresden, Germany
Understanding the role of the magnetic domain structure on the magneto-dynamic properties of patterned thin film structures is crucial for the optimization of high frequency devices, e.g. recording heads, integrated inductors and filters. We show that a controllable domain design offers the advantage of tuning the ferromagnetic zero and low field resonance frequency.
Therefore we studied the dynamic response of closure domain structures in patterned amorphous Co40Fe40B20 stripe arrays with varying domain wall density using pulsed inductive microwave magnetometry. We show that the domain resonance frequency increases significantly the more neighboured crosstie walls interact with each other. A qualitative concept of dynamic magnetic charges is discussed as the origin of such a resonance frequency increase. The dynamic charge concept also allows the explanation of a pronounced resonance frequency increase in concertina domain structures that develop in lens shaped elements.