Contact

Dr. Kilian Lenz
Research Group Head
Magnetization Dynamics
k.lenzAthzdr.de
Phone: +49 351 260 - 2435
Fax: +49 351 260 - 12435

Morphology induced magnetic correlation effects in mesoscopic wire and island structures

 

Supported by DFG: FA 314/6-1

 

Abstract

Surface and interface roughnesses or modulations play a significant role for a large number of properties of thin magnetic films. For example, it is possible to induce magnetic anisotropy contributions and additional magnetic damping phenomena due to a periodic surface modulation. The microscopic origin can be extrinsic, due to dipolar stray fields, as well as intrinsic, due to spin-orbit coupling phenomena at monoatomic steps. The relative contribution of both microscopic effects to the macroscopically measurable material properties depend sensitively on the film crystallinity, the exchange correlation length and the modulation wavelength and amplitude. The latter can be varied by the use of ion erroded semiconductor substrates and determined quantitatively. By this means also the investigation of application relevant polycrystalline films is possible. The major goal of the project will be the enlighten the functional dependence between atomistic film morphology and the resulting magnetic anisotropy and damping phenomena.

Figures

Correlation AFM

Correlation Sketch

  • AFM image of a selforganized Si surface. A nice ripple structure is observed.

  • Sketch of a ripple structure created by means of low-energy ion erosion.

     

Correlation TEM

  • Cross-sectional TEM image of a metallic film on top of the Si ripple structure. The morphology of the film reproduces that of the substrate perfectly.

     
 

People

Stefan Facsko
Jürgen Fassbender
Monika Fritzsche
Adrian Keller
Michael Körner
Kilian Lenz
Maciej Oskar Liedke

Publications

Two-magnon scattering in permalloy thin films due to rippled substrates
M. Körner, K. Lenz, R. A. Gallardo, M. Fritzsche, A. Mücklich, S. Facsko, J. Lindner, P. Landeros, and J. Fassbender
Phys. Rev. B 88, 054405 (2013)

Crossover in the surface anisotropy contributions of ferromagnetic films on rippled Si surfaces
M. O. Liedke, M. Körner, K. Lenz, M. Fritzsche, M. Ranja, A. Keller, E. Cizmar, S. A. Zvyagin, S. Facsko, K. Potzger, J. Lindner, and J. Fassbender
Phys. Rev. B 87, 024424 (2013).

Magnetic anisotropy engineering: Single-crystalline Fe films on ion eroded ripple surfaces
M. O. Liedke, M. Körner, K. Lenz, F. Grossmann, S. Facsko, and J. Fassbender
Appl. Phys. Lett. 100, 242405 (2012).

Interlayer exchange coupling of Fe/Cr/Fe thin films on rippled substrates
M. Körner, K. Lenz, M. O. Liedke, T. Strache, A. Mücklich, A. Keller, S. Facsko, and J. Fassbender
Phys. Rev. B 80, 214401 (2009)

Introducing artificial lenth scales to tailor magnetic properties
J. Fassbender, T. Strache, M. O. Liedke, D. Markó, S. Wintz, K. Lenz, A. Keller, S. Facsko, I. Mönch, J. McCord
New Journal of Physics 11,125002 (2009)

Nano-Wellblech mit großer magnetischer Wirkung
press release of FZ Dresden-Rossendorf from 26th June 2007

Induced anisotropies in exchange coupled systems on rippled substrates
M. O. Liedke, B. Liedke, A. Keller, B. Hillebrands, A. Mücklich, S. Facsko, J. Fassbender
Phys. Rev. Lett. B 75, 220407 (R) (2007) and Virt. J. Nanoscale Sci. and Technol., July 2007.

Investigation of the polycrystalline Ni81Fe19/Fe50Mn50 exchange bias system with a varying spacer layer for partial decoupling
M. O. Liedke, H. Nembach, B. Hillebrands, J. Fassbender
J. Magn. Magn. Mater. 290-291, 588 (2005).

Phase diagrams and energy barriers of exchange biased bilayers with additional anisotropies
T. Mewes, H. Nembach, J. Fassbender, B. Hillebrands, J. V. Kim, R. L. Stamps
Phys. Rev. B 67, 104422 (2003).

Angular dependence and phase diagrams of exchange coupled epitaxial Ni81Fe19/Fe50Mn50(001) bilayers
T. Mewes, H. Nembach, M. Rickart, S. O. Demokritov, J. Fassbender, B. Hillebrands
Phys. Rev. B 65, 224423 (2002).

Growth morphology in the Co/Cu(001) system
J. Fassbender, A. Bischof, R. Allenspach, U. May, M. Lange, U. Rüdiger, G. Güntherodt
Surf. Sci. 488, 99 (2001).

Intermixing and growth kinetics of the first Co monolayers on Cu(001)
J. Fassbender, R. Allenspach, U. Dürig
Surf. Sci. Lett. 383, L742 (1997).

Oscillatory surface in-plane lattice spacing during growth of Co and Cu on a Cu(001) single crystal
J. Fassbender, U. May, B. Schirmer, R. M. Jungblut, B. Hillebrands, G. Güntherodt
Phys. Rev. Lett. 75, 4476 (1995).


Contact

Dr. Kilian Lenz
Research Group Head
Magnetization Dynamics
k.lenzAthzdr.de
Phone: +49 351 260 - 2435
Fax: +49 351 260 - 12435