SummaryIon beams can induce several kinds of structures at the surface of solids. Those are either point-like defects, which can alter the electronic or magnetic properties of the surface or morphological changes such as self organized ordered ripples induced by ion beam erosion. In-situ deposition of a thin metallic layer onto such a surface can influence its magnetic properties, e.g. magnetic anisotropy. The effects are investigated mainly for oxide/metal interfaces.
Example for a magnetic film exhibiting two independent magnetic anisotropies. The uinidirectional (exchange-bias) anisotropy can be setup in a desired direction with respect to the uniaxial ripple induced anisotropy.
(a) Microscopic image of an exchange-bias film deposited on a substrate with self-organized ripples
(c) TEM cross section
Magnetic hysteresis curves recorded at two different orientations of both anisotropy contributions.
Interlayer exchange coupling of Fe/Cr/Fe thin films on rippled substrates
M. Koerner, K. Lenz, M. O. Liedke, T. Strache, A. Muecklich, A. Keller, S. Facsko, and J. Fassbender
Introducing artificial length scales to tailor magnetic properties
J. Fassbender, T. Strache, M. O. Liedke, D. Marko, S. Wintz, K. Lenz, A. Keller, S. Facsko, I. Moench,and J McCord
Induced anisotropies in exchange-coupled systems on rippled substrates
M. O. Liedke, B. Liedke, A. Keller, B. Hillebrands, A. Muecklich, S. Facsko, and J. Fassbender