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Composite magnetic films for ultrahigh density opt-magnetic hybrid recording (Approach from magneto optical recording film)

用于超高密度光磁混合记录的复合磁性薄膜（来自磁光记录薄膜的方法）

基本信息

批准号：
16360182
负责人：
ITOH Akiyoshi
金额：
$ 9.79万
依托单位：
Nihon University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

We have succeeded to obtain perpendicular magnetized films consists of small grains of FePt by using a rapid thermal annealing : RTA method on to thermally oxidized SiO_2 thin films on Si substrates. As deposited films of FePt by sputtering method are continuous films, however after RTA they become small grains of (001) oriented L1_0 phase crystalline structure showing a perpendicular magnetization. The average grain diameter is strongly depended on the film thickness of as sputtered film before RTA.TbFeCo film is fabricated on isolated FePt grains to increase the domain wall coercivity (Hw) of TbFcCo film by exchange coupling effect between TbFeCo and FePt The transition metal(TM) moment has a dominant charge in TbFeCo film langing from room temperature (Troom) to Curie temperature. The FePt has average grain sizes such as 29.6, 16.6 and 7.0 nm in diameter, which are perpendicularly magnetized with a high coercivity (Hc), as high as 30-45 kOe at Troom. The TbFeCo/FePt composite film shows higher Hw, Hc and MsHw than those of the singe ayer of TbFeCo film. We also estimate the amount of interfacial wal energy between TbFeCo and FePt.We succeeded to fabricate SiO_2 film having nano-hollowws inside and show that the spatter etching is effective to crop out the nano-dent array at the surface. The highly ordered structure of the nano-pore thin film is formed by ordering of self-assembled triblock copolymer micelles.Two complementary methods, namely the magneto-optical Kerr effect (MOKE) and magnetically induced optical second harmonic generation (MSHG) were used to detect the magnetization behavior in the bulk of the film and at its interfaces, respectively. A clear difference between the two methods was observed that could only be related to the different magnetic behavior in the bulk and at the interfaces of the film.

采用快速热退火RTA法，在Si衬底的热氧化SiO_2薄膜上成功地获得了由小晶粒FePt组成的垂直磁化薄膜。溅射法沉积的FePt薄膜为连续薄膜，而RTA后，薄膜呈（001）取向L1_0相的小晶粒，呈垂直磁化结构。平均晶粒直径在很大程度上取决于RTA前溅射膜的膜厚。在孤立的FePt晶粒上制备TbFeCo薄膜，利用TbFeCo与FePt之间的交换耦合效应，提高了tbfco薄膜的畴壁矫顽力（Hw）。从室温（Troom）到居里温度，TbFeCo薄膜的过渡金属（TM）矩占主导地位。FePt的平均晶粒尺寸分别为29.6、16.6和7.0 nm，垂直磁化后的矫顽力（Hc）高达30-45 kOe。TbFeCo/FePt复合膜的Hw、Hc和MsHw均高于单层TbFeCo膜。我们还估计了TbFeCo和FePt之间的界面壁能。我们成功地制备了内部有纳米空洞的SiO_2薄膜，并证明了溅射刻蚀可以有效地去除表面的纳米凹痕阵列。高度有序的纳米孔薄膜结构是由自组装的三嵌段共聚物胶束有序形成的。利用磁光克尔效应（MOKE）和磁致光二次谐波产生（MSHG）两种互补的方法分别检测了薄膜本体和界面处的磁化行为。两种方法之间的明显差异被观察到，这只能与体和膜界面的不同磁性行为有关。