Nano Science and Technology Institute
Nanotech 2011 Vol. 2
Nanotech 2011 Vol. 2
Nanotechnology 2011: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational
Chapter 4: NanoFab: Manufacturing & Instrumentation

A new route to control the enhancement of structural and anisotropy ordering in two-dimensional particle arrays

Authors:A. Regtmeier, F. Wittbracht, I. Dück, T. Rempel, A. Weddemann, A. Hütten
Affilation:Bielefeld University, DE
Pages:257 - 260
Keywords:anisotropy, ordering, enhancement, nanoparticles
Abstract:For the realization of data storage devices two fundamental requirements are necessary to guarantee good functionality: a) particles need to be arranged within a sizeable, two-dimensional monolayer of high spatial ordering and b) magnetic states need to maintain stability against thermal pertubations which can be realized by a high anisotropy. We present novel possibilities to enhance the structural ordering of nanoparticles during sample preparation and the anisotropy subsequent. A rotating homogeneous magnetic field allows for the creation of highly ordered two-dimensional particle arrays. Via exposure of these arrays to hydrogen plasma a multistep process is initiated, increasing the magnetic moment and inducing the ordering of the magnetocrystalline easy axes. Our experimental observations are in agreement with simulations of two-dimensional arrays of interacting dipolar particles.
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