| Autor: |
Jung, H. S., Velu, E. M. T., Avenell, M., Malhotra, S. S., Bertero, G. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 4/15/2006, Vol. 99 Issue 8, p08Q901, 3p, 1 Black and White Photograph, 5 Graphs |
| Abstrakt: |
We have successfully demonstrated single-domain hard-magnet-biased (HB) soft magnetic underlayers (SULs) by means of a synthetic antiferromagnetically (SAF)-coupled structure. Magnetically in-plane isotropic CoCrTa-based alloys as a hard-magnet pinning layer were used. Amorphous soft CoTaZr was chosen as a pinned layer to minimize coercivity (Hc) at a thickness of 50–200 nm. Minor loops of CoCrTa/Ru/CoTaZr clearly showed single remanent magnetization and radial anisotropy orientation, and a single-domain structure was confirmed by Kerr images. Interfacial exchange energy (JAF) was in the range of 0.05–0.36 erg/cm2, which strongly depends on the kind of pinning layer used. HB SAF SUL exhibited a higher switching field (Hsw-) of 200–600 Oe than Hc in a single CoCrTa layer. The difference between Hsw- and Hc depends on the composition of CoCrTa and the relative thickness ratio of CoCrTa and CoTaZr. A radial anisotropy of the pinning layer in any directions is induced by applying an external field greater than Hsw- at room temperature. HB SAF SUL with Hsw-=936 Oe exhibited outstanding robustness to stray fields of up to 500 Oe. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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