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MA: Fachverband Magnetismus

MA 29: Micro- and Nanostructured Magnetic Materials II

MA 29.1: Vortrag

Mittwoch, 16. März 2011, 11:00–11:15, HSZ 103

Magnetostatic interaction of single NiFe nanostructures — •Mahmoud Reza Rahbar Azad, André Kobs, Hendrik Spahr, Björn Beyersdorff, Daniel Stickler, Robert Frömter, and Hans Peter Oepen — Institut für Angewandte Physik, Universität Hamburg, Jungiusstr. 11, 20355 Hamburg, Germany

The magneto-static interaction between submicron Ni₈₀Fe₂₀ rectangles with aspect ratio of two has been investigated by means of magnetotransport measurements using anisotropic magneto resistance (AMR). The structures have been carved into a Cr(10nm)/Ni₈₀Fe₂₀(20nm)/Pt(2,5nm) trilayer utilizing a highly focused ion beam (FIB). The material surrounding the rectangles has been milled paramagnetic by applying a Ga⁺-ion dose of 6000 µC/cm², which destroys ferromagnetism but guarantees an adequate electric conductivity. The contacting of the submicron rectangles was performed in situ via a tungsten tip attached to a micromanipulator [1]. Microcircuit milled by FIB enables us to measure the magnetic behavior of one single element of an array of rectangles [2]. Due to the high flexibility of our setup [1] we could systematically vary the distance between the rectangles as well as the size. Besides determining the magnetic energy of the micro-magnetic states, i.e. the Landau state of an individual rectangle [2], we can measure the strength of the magneto-static interaction between the rectangles.
Daniel Stickler et al., Rev. Sci. Instr. 79, 103901 (2008)
André Kobs et al., Phy. Rev. B 80, 134415 (2009)