Regensburg 2010 – scientific programme

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MA: Fachverband Magnetismus

MA 33: Poster II

MA 33.21: Poster

Friday, March 26, 2010, 11:00–14:00, Poster B1

Ensemble and single-object measurements of magnetic nanowires with modulated diameter — Kristina Pitzschel¹, Josep M. Montero Moreno^1,2, Stephan Martens¹, •Ole Albrecht¹, Julien Bachmann¹, and Kornelius Nielsch¹ — ¹Institute of Applied Physics and Microstructure Research Center Hamburg, University of Hamburg — ²Electrodep., Dept. Physical Chemistry, Universitat de Barcelona

We utilize a porous alumina membrane as template with modulated diameter [1,2]. Filling the pores with Ni by electrodeposition delivers wires replicating the changes in diameter from 70 to 150 nm. These structures are ferromagnetic. Ensemble magnetic measurements by SQUID (Superconducting QUantum Interference Devic) and single-objetc measurements by Magneto-optical Kerr effect evidence a strong correlation between geometric parameters and magnetic properties. On the contrary to single-object measurements ensemble measuremets also show their dipolar interactions. Magneto-optical Kerr effect mea- surements on single wires reveal that motion of domain boundaries are blocked at certain changes in diameter. This demonstrates for the first time that domain wall motion can be controlled in nano-object prepared by a mass production method.[1] W. Lee et al., Nature Nan- otech. 3, 234 - 239 (2008).[2] K. Pitzschel et al., ACS Nano 2009 3 (11), 3463-3468