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Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)

MA 63.14: Poster

Friday, March 18, 2011, 11:00–14:00, P2

Quantifying magnetic moments µ in magnetic force microscopy (MFM) tips — •Denny Köhler, Peter Milde, Ulrich Zerweck-Trogisch, and Lukas M. Eng — Institut für Angewandte Photophysik, TU Dresden, Deutschland

Measuring quantitative magnetic moments becomes one of the major tasks in nanomagnetic research. Here, we present a novel way to characterize magnetic force microscopy (MFM) tips in homogeneous external magnetic fields. Our methods basis on the deflection of the cantilever caused by the mechanical torque [1] as it is induced by an external magnetic field.

Low temperature measurements of the frequency-shift and static deflection of the cantilever in a variable external magnetic field are used to access the different vectorial components of the magnetic moment µ of the tip. This allows to quantify both the magnitude and 3D spatial orientation of µ. Experimental results are compared with the theoretical behaviour of the magnetic dipole moment of the cantilever as calculated by combining a harmonic oscillator model with the minimization of the magnetic energy.

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