Ultrathin Co/Pt and Co/Pd new magneto-optical recording media

Shunichi Hashimoto; Hideki Matsuda; Yoshitaka Ochiai

doi:10.1117/12.19627

1 August 1990 Ultrathin Co/Pt and Co/Pd new magneto-optical recording media

Shunichi Hashimoto, Hideki Matsuda, Yoshitaka Ochiai

Proceedings Volume 1248, Storage and Retrieval Systems and Applications; (1990) https://doi.org/10.1117/12.19627
Event: Electronic Imaging: Advanced Devices and Systems, 1990, Santa Clara, CA, United States

Abstract

Co/Pt and Co/Pd multilayers were prepared by two source dc-magnetron sputtering. Magneto-optical properties of these multilayers were affected by total film thickness, and a perfect squareness of Kerr loop and an enhancement of Kerr rotation angle weresimultaneously achieved when the film thickness was below several hundred angstroms. The improvement of Kerr remanence ratio can be explained by the change in domain structure from a stripe domain to a single domain, d the enhancement of Kerr rotation is due to the optical interference effect with the multiple reflection. The ultrathin films have high corrosion resistance, large Kerr rotation and strong perpendicular magnetic anisotropy even in very thin film thickness. A hermomagnetic writing was successfully made in the magneto-optical disks using these ultrathin media,and the C/N ratio showed 53 dB and 46 dB for Co/Pt and Co/Pd disks,respectively.The figure of merit becomes larger at shorter wavelength, and thus the ultrathin multilayers can be new promising magneto-optical recording media, especially for higher density recording using a shorter wavelength laser.

Citation Download Citation

Shunichi Hashimoto, Hideki Matsuda, and Yoshitaka Ochiai "Ultrathin Co/Pt and Co/Pd new magneto-optical recording media", Proc. SPIE 1248, Storage and Retrieval Systems and Applications, (1 August 1990); https://doi.org/10.1117/12.19627

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