Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 33: Poster II
MA 33.84: Poster
Freitag, 26. März 2010, 11:00–14:00, Poster B1
High frequency magnetotransport in ferromagnetic thin films — •M. Radlmeier, M. Weiler, H. Huebl, C. Heeg, A. Brandlmaier, R. Gross, and S. T. B. Goennenwein — Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, D-85748 Garching
DC magnetotransport is an established technique to determine static magnetic properties of ferromagnetic thin films and to electrically read out magnetization states in nanostructures. As modern devices for information technology are operated at frequencies in the GHz regime, it is important to compare DC and HF transport characteristics. To gather further information on the physical mechanisms involved in HF magnetotransport, one needs to investigate and compare the temperature dependence of DC and HF transport as well. We have prepared Hall bars of Co and Ni thin films by optical lithography and electron beam evaporation. These are bonded onto slotted CPW carriers and then mounted on a magnet cryostat dipstick equipped with HF leads. This allows to measure DC and HF magnetotransport with 2 K≤ T ≤ 300 K and µ0 H≤ 7 T. Furthermore, the sample can be rotated with respect to the magnetic field. A vector network analyzer is used to measure HF magnetotransport in a frequency range up to 8 GHz and the results are compared to DC magnetotransport measurements. While the DC magnetotransport provides information on static magnetic properties such as magnetization orientation and magnetic anisotropy, we discuss the features observed in HF magnetotransport in terms of giant magnetoimpedance and HF susceptibility.
This work is supported by the DFG via project GO 944/3.