Magnetization Process of High Anisotropy Copt Nanosized Dots


Kikuchi, N. and Murillo, R. and Lodder, J.C. and Mitsuzuka, K. and Shimatsu, T. (2005) Magnetization Process of High Anisotropy Copt Nanosized Dots. IEEE Transactions on Magnetics, 41 (10). pp. 3613-3615. ISSN 0018-9464

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Abstract:Dot arrays with diameter ranging from 80 to 245 nm are made of Co/sub 80/Pt/sub 20/ films with large perpendicular anisotropy. Magnetic properties are investigated by detecting the anomalous Hall effect. The all arrays show angular dependence of remanent coercivity similar to coherent rotation. The result shows that reversal process is independent of dot diameter. The energy barrier height of magnetization reversal is estimated as 1.0/spl times/10/sup -10/ erg for the array consists of 140-nm-diameter dots. From the energy value, the switching volume is estimated as equivalent to the volume of a physical grain in the film. The results indicate that the reversal process starts from a nucleation of a "reversed grain" followed by propagation process.
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Copyright:©2005 IEEE
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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