Seminars at the Acceletator - Nanomagnets, created and tailored by ions
17.09.2013 - 17.09.2013
CMAM - Madrid
Informal seminars at the Accelerator


Speaker: Jürgen Fassbender, Helmholtz-Zentrum Dresden-Rosendorf

Title: Nanomagnets, created and tailored by ions

Abstract: Magnetism is a collective phenomena. Hence, a local variation on the nanoscale of material properties which act on the magnetic properties affect the overall magnetism in an intriguing way [1-4]. In particular important are the length scales on which a material property changes. These might be related to the exchange length, the domain wall width, a typical roughness correlation length or a length scale introduced by patterning of the material. Here we report on the influence of two artificially created length scales: i) Ion erosion templates which serve as a source of a predefined surface morphology and hence allow for the investigation of roughness phenomena, ii) Ion irradiation through a lithographically defined mask which is used for a magnetic property patterning on various length scales. The resulting magnetic properties are neither present in non-irradiated nor in homogeneously irradiated films. In both cases the magnetic properties, the magnetization reversal process as well as the magnetic domain configurations depend sensitively on the artificially introduced length scale.


[1] E. Menendez, J. Sort, M. O. Liedke, J. Fassbender, T. Gemming, A. Weber, L. J. Heydermann, S. Surinach, K. V. Rao, S. C. Deevi, M. D. Baro, J. Nogues, Creation of sub-100 nm ferromagnetic dots by selective irradiation of a paramagnetic intermetallic alloy, Small 5, 229 (2009).

[2] J. McCord, L. Schultz, J. Fassbender, Hybrid soft-magnetic films with novel functionality created by magnetic property patterning, Advanced Materials 20, 2090 (2008).

[3] J. Fassbender, J. McCord, Magnetic patterning by means of ion irradiation and implantation, J. Magn. Magn. Mater. 320, 579 (2008).

[4] M. O. Liedke, B. Liedke, A. Keller, B. Hillebrands, A. Mücklich, S. Facsko, J. Fassbender, Induced anisotropies in exchange coupled systems on rippled substrates, Phys. Rev. B 75, 220407(R) (2007).



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