Magnetic domain-free hard-magnet-biased soft magnetic underlayers for perpendicular media

被引：0
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作者：
Jung, H.S. [1 ]
Velu, E.M.T. [1 ]
Avenell, M. [1 ]
Malhotra, S.S. [1 ]
Bertero, G. [1 ]
机构：
[1] Komag Inc., 1710 Automation Parkway, San Jose, CA 95131
来源：
Journal of Applied Physics | 2006年 / 99卷 / 08期
关键词：
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 CoCrTaRuCoTaZr 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. © 2006 American Institute of Physics;
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