Thermally induced switching field distribution of a single CoPt dot in a large array

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Engelen, J.B.C. and Delalande, M. and Febre le, A.J. and Bolhuis, T. and Kikuchi, N. and Abelmann, L. and Lodder, J.C. and Shimatsu, T. (2010) Thermally induced switching field distribution of a single CoPt dot in a large array. Nanotechnology, 21 (3). 035703-035709. ISSN 0957-4484

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Abstract:Magnetic dot arrays with perpendicular magnetic anisotropy were fabricated by patterning Co80Pt20-alloy continuous films by means of laser interference lithography. As commonly seen in large dot arrays, there is a large difference in the switching field between dots. Here we investigate the origin of this large switching field distribution, by using the anomalous Hall effect (AHE). The high sensitivity of the AHE permits us to measure the magnetic reversal of individual dots in an array of 80 dots with a diameter of 180 nm. By taking 1000 hysteresis loops we reveal the thermally induced switching field distribution SFDT of individual dots inside the array. The SFDT of the first and last switching dots were fitted to an Arrhenius model, and a clear difference in switching volume and magnetic anisotropy was observed between dots switching at low and high fields.

Item Type:Article
Copyright:© 2010 IOP Publishing
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/68790
Official URL:http://dx.doi.org/10.1088/0957-4484/21/3/035703
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