1993 Fiscal Year Final Research Report Summary
Research of Ultra High Density Magneto-optical Recording Material
| Project/Area Number |
04452173
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
電子材料工学
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| Research Institution | Nagoya University |
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Principal Investigator |
UCHIYAMA Susumu Nagoya University, Faculty of Engineering, Professor, 工学部, 教授 (40023022)
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| Co-Investigator(Kenkyū-buntansha) |
HANE Kazuhiro Nagoya Univ., Faculty of Engineering, Associate Professor, 工学部, 助教授 (50164893)
IWATA Satoshi Nagoya Univ., Faculty of Engineering, Associate Professor, 工学部, 助教授 (60151742)
TSUNASHIMA Shigeru Nagoya Univ., Faculty of Engineering, Professor, 工学部, 教授 (80023323)
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| Project Period (FY) |
1992 – 1993
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| Keywords | Magneto-optics / Super Lattice / Magnetic Anisotropy / Multilayr / Magneto-striction / Exchange-coupling / 磁歪 |
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| Research Abstract |
Magnetostriciton constants lambda_<111> and lambda_<100> were estimated for [111] oriented polycrystalline PdCo and PtCo alloy films and multilayr films (MLs) from the induced anisotropy. It was found that the mangetostriction constants of Pd/Co and Pt/Co MLs are not determined by the mangetostriction constants of fcc Co, but are strongly affected by those of PdCo and PtCo alloys. This result implies the effect of electron hybridization and/or alloy formation at the interface.
Magneto-optical Kerr hysteresis loops and their energy spectra are measured for ultrathin Co films. In Au/20 A Co/Au sandwiches, the spectra shape of the Kerr rotation as well as the Kerr ellipticity agrees with those calculated from bulk data. With decreasing Co thickness, the spectral shape becomes different from the calculated one. The imaginary prot of off-diagonal conductivity was also estimated for ultrathin Co films.
Magnetic and magnetooptic properties have been investigated for NdGd/Fe and NdGd/FeCo multilayrs prepared by rf sputtering method. At a bilayr period of 10 to 15 A, perpendicular magnetic anisotropy showed the maximum value of about 2.5 X 10^6 erg/cm^3. Magnetooptic Kerr rotation of the multilayrs reach 0.33ﾟ at 400 nm, reflecting the contribution of Nd.
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