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Miniaturization of data storage devices? Origin of ultra-fast manipulation of domain walls discovered

Date:
October 5, 2012
Source:
Universität Mainz
Summary:
Researchers have found a surprising effect that leads in ferromagnetic materials to a spatially varying magnetization manipulation on an ultrafast timescale. This effect could be the key to further miniaturization and performance increase of magnetic data storage devices.

Magnetic force microscopy image of a 10µm X 10µm sized sample showing a labyrinth-type magnetic domain structure. The magnetization is oriented perpendicularly to the surface (white: magnetization pointing out of the plane; brown: magnetization pointing into the plane).
Credit: photo/©: Bastian Pfau, TU Berlin

An international team of researchers has found, at the free electron laser FLASH in Germany, a surprising effect that leads in ferromagnetic materials to a spatially varying magnetization manipulation on an ultrafast timescale. This effect could be the key to further miniaturization and performance increase of magnetic data storage devices. From Mainz, the group of Professor Dr. Mathias Kläui from the Institute of Physics at Johannes Gutenberg University Mainz and in particular Felix Büttner, a member of the Graduate School of Excellence "Materials Science in Mainz," were involved.

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The results have been published in the current issue of Nature Communications.

It is known that magnetization can be manipulated by short light pulses but so far the spatially-resolved magnetization change could not be determined due to the limited spatial resolution of conventional optical techniques. Since most of the ferromagnetic materials consist of multiple domains with different magnetization directions, the local change of the magnetization in these domains and at the interfaces between the domains, i.e. at the so-called domain walls, is of particular interest. At the FLASH free electron laser at the DESY Research Center in Hamburg, results were obtained that are in agreement with a recently theoretically predicted mechanism: due to the laser pulses, highly excited electrons are generated that move quickly through the material. They thus move from one domain into a neighboring domain with a different magnetization direction. Since the electrons carry part of the magnetization, they manipulate the magnetization in the domains as they move across a domain wall. This means that domain walls can change their geometry on the fs time scale.

As domain walls are also used in memory devices, such as the racetrack memory, these investigations could be the first step to improving the performance of such devices. The racetrack memory is a development by IBM and could in the future be a fast and low power alternative to conventional random access memory or hard drives.

The experiments were carried out by the researchers from Johannes Gutenberg University Mainz (JGU) with colleagues from TU Berlin, the universities of Hamburg and Paris, and six further research institutes at the free electron laser FLASH at DESY in Hamburg. The samples investigated consist of a cobalt-platinum multilayer system, which forms labyrinth-type domain structures.


Story Source:

The above story is based on materials provided by Universität Mainz. Note: Materials may be edited for content and length.


Journal Reference:

  1. B. Pfau, S. Schaffert, L. Müller, C. Gutt, A. Al-Shemmary, F. Büttner, R. Delaunay, S. Düsterer, S. Flewett, R. Frömter, J. Geilhufe, E. Guehrs, C.M. Günther, R. Hawaldar, M. Hille, N. Jaouen, A. Kobs, K. Li, J. Mohanty, H. Redlin, W.F. Schlotter, D. Stickler, R. Treusch, B. Vodungbo, M. Kläui, H.P. Oepen, J. Lüning, G. Grübel, S. Eisebitt. Ultrafast optical demagnetization manipulates nanoscale spin structure in domain walls. Nature Communications, 2012; 3: 1100 DOI: 10.1038/ncomms2108

Cite This Page:

Universität Mainz. "Miniaturization of data storage devices? Origin of ultra-fast manipulation of domain walls discovered." ScienceDaily. ScienceDaily, 5 October 2012. <www.sciencedaily.com/releases/2012/10/121005123738.htm>.
Universität Mainz. (2012, October 5). Miniaturization of data storage devices? Origin of ultra-fast manipulation of domain walls discovered. ScienceDaily. Retrieved January 25, 2015 from www.sciencedaily.com/releases/2012/10/121005123738.htm
Universität Mainz. "Miniaturization of data storage devices? Origin of ultra-fast manipulation of domain walls discovered." ScienceDaily. www.sciencedaily.com/releases/2012/10/121005123738.htm (accessed January 25, 2015).

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