Research of Ultra High Density Magneto-optical Recording Material

超高密度磁光记录材料的研究

• 批准号: 04452173
• 负责人: UCHIYAMA Susumu
• 金额: $ 4.16万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452173/
• 关键词: Magneto-optics; Super Lattice; Magnetic Anisotropy; Multilayr; Magneto-striction; Exchange-coupling; 磁歪; 磁性多層膜; 磁気弾性異方性; 磁歪定数

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.

根据诱导各向异性，估算了[111]取向PdCo和PtCo合金多层膜和多层膜的磁致伸缩常数。结果表明，Pd/Co和Pt/Co合金的磁致伸缩常数不受面心立方Co的磁致伸缩常数的影响，但受PdCo和PtCo合金的磁致伸缩常数的影响较大。测量了超薄Co薄膜的磁光Kerr磁滞回线及其能谱。在Au/20A Co/Au三明治中，克尔旋转和克尔椭圆度的谱形与由块体数据计算的结果一致。随着Co厚度的减小，光谱形状变得与理论计算的不同。研究了射频溅射制备的NdGd/Fe和NdGd/FeCo多层膜的磁学和磁光性质。在10~15A的双层周期内，垂直磁各向异性出现最大值，约为2.5×10~(-6)erg/cm~(-3)。多层膜的磁光克尔转角在400 nm处达到0.33ﾟ，反映了Nd的贡献。

项目成果

H.Takahashi: "Measurement of Magnetostriction Constants in(111)-Oriented Polycrystalline PdCo Alloy and Multilayered Films" Jpn.J.Appl.Phys.32. L1328-L1331 (1993)

H.Takahashi：“（111）取向多晶 PdCo 合金和多层薄膜中磁致伸缩常数的测量”Jpn.J.Appl.Phys.32。

A.Yamaguchi: "Magneto-Optical Effect of Ultrathin Co Films" J.Magn.& Magn.Mat.121. 542-544 (1993)

A.Yamaguchi：“超薄钴薄膜的磁光效应”J.Magn。

X.Y.Yu, S.Tsunashima, S.Uchiyama: ""Magnet-Optic Properties of (Nd, Pr)Gd/FeCo Multilayrs"" J.Magn.Soc.Jpn.Vol.16, No.3. 547-550 (1992)

X.Y.Yu、S.Tsunashima、S.Uchiyama：“(Nd, Pr)Gd/FeCo 多层膜的磁光特性”J.Magn.Soc.Jpn.Vol.16，No.3。

X.Y.Yu, H.Watabe, S.Iwata, S.Tsunashima, S.Uchiyama, R.Gerber: ""Magnet-Optic Kerr Rotation of Rare Earth-Iron Based Alloys"" Mat.Res.Soc.Symp.Proc.(1993)

X.Y.Yu、H.Watabe、S.Iwata、S.Tsunashima、S.Uchiyama、R.Gerber：“稀土铁基合金的磁光克尔旋转”Mat.Res.Soc.Symp.Proc.（

A.Yamaguchi(4名): "Magneto-optical effect of ultra thin Co films" J.Magnetism and Magneticmaterials,to be published. (1993)

A.山口（4人）：《超薄Co薄膜的磁光效应》J.Magnetism and Magnetic Materials，待出版（1993年）。