| Autor: |
J.C. Toussaint, Massimo Ghidini, Dominique Givord, J.P. Nozières, B. Gervais, B. Kevorkian |
| Rok vydání: |
1998 |
| Předmět: |
|
| Zdroj: |
IEEE Transactions on Magnetics. 34:991-993 |
| ISSN: |
0018-9464 |
| DOI: |
10.1109/20.706334 |
| Popis: |
2.5 nm wide amorphous ferromagnetic nanocolumns were prepared by swift heavy ions irradiation of paramagnetic YCo/sub 2/ thin films. The shape anisotropy-induced coercive field H/sub C/ is approximately half the anisotropy field H/sub A/. Magnetic aftereffect measurements reveal that the activation volume involved during magnetization reversal is comparable to the particle size. Given the small diameters involved, such a behaviour can be addressed either by Stoner-Wohlfarth rotation with surface perturbation or to the end-surface nucleation of a 1-D domain wall. For the later, an upper bound of the coercive field, estimated by considering a simple planar configuration, yields a reduced H/sub c//H/sub A/ ratio in agreement with the experimental value. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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