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MA: Fachverband Magnetismus
MA 19: Poster I (Bio- and Molecular Magnetism/ Magnetic Particles and Clusters/ Micro- and Nanostructured Magnetic Materials/ Magnetic Materials/ Multiferroics/ Magnetic Shape Memory Alloys/ Electron Theory of Magntism/ Spincaloric Transport/ Magnetic Coupling and Exchange Bias/ Magnetization Dynamics/ Micromagnetism and Computational Magnetics)
MA 19.97: Poster
Tuesday, March 15, 2011, 10:45–13:00, P2
(contribution withdrawn) Determination of inertial mass of pulsed field-driven domain walls in GMR nanostripes — •Bjoern Burkhardt, Sascha Glathe, and Roland Mattheis — IPHT Jena e.V., Albert-Einstein-Str. 9, 07745 Jena
Domain walls (DW) can be described as quasiparticles with typical mechanic characteristics, e.g. an effective mass. For field driven DW motion one can assume a linear dependence between the DW velocity and field-pulse length for short pulse length (t ≈ 1 ns) and small fields (H < Hw, Walker field), which is confirmed by the 1D-Modell by Slonczewski [1]. In this regime the DW is uniformly accelerated until the equilibrium state and thus the maximum velocity for the applied field is reached. Using this regime and assuming a driving force derived from the magnetostatic potential, one can deduce an effective mass of the DW. We have measured domain wall velocities for short field pulses in thin and narrow nanostripes (w = 500nm, l = 45 µm) using the giant magnetoresistance effect between a sense layer (NiFe - 20nm thick) and a reference layer (CoFe - part of an AAF/AF-combination). The magnetic field is generated by short current pulses in a coplanar waveguide crossing the GMR nanostripe. We determined the effective mass of a DW (m ≈ 10−23kg) which is in good quantitative agreement with theory [2].
[1] A. Malozemo and J. Slonczewski, Magnetic Domain Walls in Bubble Materials (Academic Press, New York, 1979).
[2] J.-Y. Lee, S. Choi, S.-K. Kim, J. Magn., 11, 74 (2006)