Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster II - Magnetic Heusler compounds, Magnetic shape memory alloys, Thin Films, Micro-/Nano-structured magnetic materials, Graphene, Spins in organics, Magnetic imaging, Surface Magnetism, Spin excitations/Torque, Spincaloric transport

MA 52.28: Poster

Freitag, 30. März 2012, 11:00–14:00, Poster A

Single wire and ensemble measurements on NixCo1-x nanowires for the determination of switching field distributions — •Philip Sergelius¹, Tim Böhnert¹, Stephan Martens¹, Victor Vega Martinez², Kornelius Nielsch¹, and Detlef Görlitz¹ — ¹Institute of Applied Physics, University of Hamburg, Hamburg, Germany. — ²Depto. Física, Universidad de Oviedo, Oviedo, Spain.

NixCo1-x nanowires with x varying between 0.05 and 0.77 have been synthesized by potentiostatic electrodeposition into self ordered Al2O3 Membranes (AAO) by hard anodization. The variation of the Ni:Co composition in the alloyed nanowires of appr. 20μm length, 150nm diameter and 305 nm spacing allows for a tuning of the switching field along the wire axes between 190 Oe and 400 Oe.

We performed First Order Reversal Curve (FORC) measurements on the nanowire ensembles in a VSM (Quantum Design VersaLab). The FORC analysis yields the distribution of the coercive fields for all nanowires in the membrane and the distribution of their interaction fields. Additionally, MOKE analyses utilizing a NanoMOKE2TM (Durham Magneto Optics Ltd) were performed on up to 100 singular wires of each ensamble in order to have adequate statistics for the distribution of coercivities ranging from 150 Oe to 450 Oe. The obtained coercivity distributions with widths of appr. 18 % from the FORC and MOKE measurements are discussed and compared revealing the impact of different interaction fields in the investigated templates.