Professor Leon Abelmann, University of Twente, The Netherlands

Shaky nanomagnets: Magnetic reversal of sub-micron Co/Pt multilayered islands studied by Anomalous Hall Effect
When Oct 17, 2014
from 02:00 PM to 03:00 PM
Where LR8, IEB Building, Engineering Science
Contact Name
Contact Phone 01865-283302
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When magnets become sufficiently small, they will have only two magnetisation states (up/down, left/right). These states are separated by an energy barrier. If the barrier is much higher than the thermal energy, the magnetisation state is stable, and we can for instance store information. The energy barrier can be overcome by external field, temperature or simply by waiting sufficiently long. By means of Anomolous Hall Effect, we have studied the reversal of individual sub-micron magnetic elements with an out-of-plane easy axis. From thousands of hysteresis loops, we tried to extract the height of the energy barrier at zero field and switching field at zero temperature. All depends however on the exact relation beween the external field and the height of the energy barrier. Here the fun starts…

 

Leon Abelmann, University of Twente, Netherlands and KIST Europe, Germany

 

Leon Abelmann is working at the Korean Institute of Science and Technology in Saarbrücken, Germany, and hold professorships at the University of Twente and Saarland University. His expertise is on magnetostatics on the micro- and nanoscale. As a PhD student and postdoc, he worked mainly in the area of magnetic data storage, moving from tape recording to magnetic force microscopy, magnetic patterned media and probe storage. When the magnetic recording industry left Europe entirely, he changed his research field towards magnetostatics in combination with fluids. He currently address magnetism in life sciences and magnetically assisted three-dimensional self-assembly.

 

http://leon.manucodiata.org