Magnetic Multilayers
Key investigator
Summary
Ion 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.Figures
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.
Left: 1° Right: 86° |
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
Phys. Rev. B 80, 214401 (2009).
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
New J. Phys. 11, 125002 (2009).
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