Domain walls as new information storage medium

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While searching for ever smaller devices that can be used as data storage systems and novel sensors, physicists at Johannes Gutenberg University Mainz (JGU) have directly observed magnetization dynamics processes in magnetic nanowires and thus paved the way for further research in the field of nanomagnetism.

This is an image of a ferromagnetic ring prepared using a scanning electron microscope: The magnetization (black/white contrast) runs along the ring and forms two domain walls. Credit: André Bisig, Institute of Physics, Johannes Gutenberg University Main

Small magnetic domain wall structures in nanowires can be used to store information and, for example, can be used as angle sensors. Initial applications based on magnetic domain walls have been developed and are already in use in sensor technology. The current findings represent the first experimentally recorded direct imaging of predicted correlations between magnetic spin structure and wall velocity. The newly discovered properties could be used for other future applications in information technology.

More information: A. Bisig et al., Correlation between spin structure oscillations and domain wall velocities, Nature Communications, 4:2328, 27. August 2013, DOI: 10.1038/ncomms3328

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