ULTRA-HIGH DENSITY MAGNETO-OPTICAL RECORDING SYSTEM

超高密度磁光记录系统

• 批准号: 08555074
• 负责人: TSUNASHIMA Shigeru
• 金额: $ 8.7万
• 依托单位: NAGOYA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08555074/
• 关键词: MAGETO-OPTICAL RECORDING; MAGNETO-OPTICAL EFFECT; OPTICAL WAVE GUIDE; OPTICAL HEAD; NEAR FIELD; KERR ROTATION

Thermomagnetic recording process has been simulated for transition metal (TM) -rich and rare earth (RE) -rich TbFeCo films assuming beam spot size of 1 and 0.1 micron, where very simple temperature dependence is assumed for the wall energy. For the TM-rich Tbl8 (Fe78Co22) 82 film, domains smaller than 0.1 micron can be written owing to the large stray field. On the other hand, for the RE-rich Tb25.6 (Fe78Co22) 74.4 film, small domains cannot be written due to the large effective field which, originating from the wall energy and its spatial gradient, forces to shrink the domain.Local structural anisotropy was estimated using extended X-ray absorption fine structure (EXAFS) spectroscopy for Dy/Fe multilayers prepared by sputtering and vacuum deposition methods.Fourier transformed Fe-EXAFS indicated a difference in the atomic coordination between in-plane and out-of-plane. Both the structural anisotropy and the perpendicular magnetic anisotropy change depending on the bilayer period and the preparation methods. The variation of the structural anisotropy was found corresponds closely to that of the perpendicular magnetic anisotropy

热磁记录过程已针对富含过渡金属 (TM) 和富含稀土 (RE) 的 TbFeCo 薄膜进行了模拟，假设束斑尺寸为 1 微米和 0.1 微米，其中假设壁能量非常简单的温度依赖性。对于富含TM的Tbl8(Fe78Co22)82薄膜，由于杂散场大，可以写入小于0.1微米的域。另一方面，对于富含稀土的 Tb25.6 (Fe78Co22) 74.4 薄膜，由于壁面能量及其空间梯度产生的大有效场迫使域收缩，因此无法写入小域。局部结构使用扩展 X 射线吸收精细结构 (EXAFS) 光谱对溅射和真空沉积方法制备的 Dy/Fe 多层膜的各向异性进行了评估。傅里叶变换 Fe-EXAFS 表明了之间的原子配位差异平面内和平面外。结构各向异性和垂直磁各向异性都根据双层周期和制备方法而变化。发现结构各向异性的变化与垂直磁各向异性的变化密切对应

项目成果

T.Kato: "Perpendicular Magnetic Anisotropy and Magneto-Optical Spectra of MBE Grown MnPt3/Co" J.Magn.Soc.Jpn. 22-S2. 85-88 (1998)

T.Kato：“MBE 生长的 MnPt3/Co 的垂直磁各向异性和磁光光谱”J.Magn.Soc.Jpn。

S.Iwata: "Magneto-Optical Spectra of MnPt_3 and Mn_<1-x>Fe_xPt_3 Alloy Films" J.Magn.Soc.Jpn.20. 427-432 (1996)

S.Iwata：“MnPt_3和Mn_<1-x>Fe_xPt_3合金膜的磁光光谱”J.Magn.Soc.Jpn.20。

X.Y.Yu, Y.Ban, S.Iwata and S.Tsunashima: "Simulation of Thermomagnetic Recording in Rare Earth-transition Magnetic Film Using Very Small Laser Spot" J.Magn.Soc.Jpn.Vol.22, No.S2. 129-132 (1998)

X.Y.Yu、Y.Ban、S.Iwata 和 S.Tsunashima：“使用非常小的激光点模拟稀土过渡磁性薄膜中的热磁记录”J.Magn.Soc.Jpn.Vol.22，No.S2。

Y.Fujiwara: "Structural and Magnetic Anisotropy of Tb/Fe Multilayers" JpnJ.Appl.Phys.Vol.36. 5097-5102 (1997)

Y.Fujiwara：“Tb/Fe 多层膜的结构和磁各向异性”JpnJ.Appl.Phys.Vol.36。

S.Iwata: "Magneto-Optical Spectra of MnPt_3 and Mn_<1-X>Fe_XPt_3 Alloy Films" J.Magn.Soc.Jpn.Vol.20. 427-432 (1996)

S.Iwata：“MnPt_3和Mn_<1-X>Fe_XPt_3合金膜的磁光光谱”J.Magn.Soc.Jpn.Vol.20。