Berlin 2012 – scientific programme

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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 52.32: Poster

Friday, March 30, 2012, 11:00–14:00, Poster A

Magnetic Films on Nanoperforated Substrates — •Carsten Schulze¹, Marco Faustini², Michael Grobis³, Denys Makarov⁴, David Grosso², and Manfred Albrecht¹ — ¹Institute of Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany — ²Laboratoire de Chimie de la Matière Condensée de Paris, Université Pierre et Marie Curie-Paris 6, CNRS, 75252 Paris Cedex 05, France — ³San Jose Research Center, Hitachi GST, San Jose, CA 95135, USA — ⁴IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany

A study of the magnetization reversal in ferromagnetic thin films with perpendicular magnetic anisotropy deposited onto substrates with densely distributed nanoperforations is presented. The nanoperforated substrates are fabricated by a wet-chemical evaporation induced self-assembly process of block-copolymer micelles, Co/Pt multilayers are used as ferromagnetic thin films. The pinning of magnetic domain walls on the substrate-induced defects has been shown earlier [1, 2], as well as the possible application of such a system as a percolated perpendicular recording medium [3, 4].

Here, the dependence of the pinning strength on the interplay between saturation magnetization, anisotropy, domain wall width and perforation size will be discussed.

[1] D. Makarov et al., IEEE Trans. Magn. 45 (2009) 3515.

[2] C. Schulze et al., Nanotechnology 21 (2010) 495701.

[3] D. Suess et al., J. Appl. Phys. 99 (2006) 08G905.

[4] M. Grobis et al., Appl. Phys. Lett. 98 (2011) 192504.