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）

• 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
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16360182/
• 关键词: Stabilization of tiny magnetic domain; SiO_2 substrate having self organized nano-scale pores; FePt particulate; Composite films; Non-linear magneto optical effect; Opt-magnetic hybrid recording; Rapid-thermal annealing method; Femto second pulse l

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.

我们成功地获得了垂直磁化膜，它是通过使用快速的热退火：RTA方法来组成的小颗粒，即在SI底物上进行热氧化的SIO_2薄膜。由于通过溅射方法沉积的薄膜是连续膜，但是在RTA之后，它们变成了（001）面向的L1_0相结晶结构的小晶粒，显示出垂直的磁化。 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. FEPT具有平均晶粒尺寸，例如直径为29.6、16.6和7.0 nm，它们垂直于高矫正率（HC），高达30-45 koe在TROOOM处。 TBFECO/FEPT复合膜显示出比TBFeco胶片的Singe Ayer的HW，HC和MSHW更高的HW，HC和MSHW。我们还估计了TBFECO和FEPT之间的界面WAL能量的量。我们成功地制造了内部纳米空心的SIO_2膜，并表明Spaters Etching有效地将表面的纳米dent阵列作出作品。纳米孔薄膜的高度有序结构是通过订购自组装的三嵌段共聚物胶束来形成的。两种互补方法，即磁光kerr效应（MOKE）和磁诱导的光学诱导的光学第二次谐波生成（MSHG），用于检测该磁场的磁场，并在其bulk bulk and Force andf of the Outhace andf。观察到两种方法之间的明显差异仅与胶片和膜界面中的不同磁性行为有关。

项目成果

Dynamic Observation of Domain Shirinking Speed Over Walker's Limit

超过沃克极限的域收缩速度的动态观测

• 发表时间: 2004
• 期刊: Trans. Magn. Soc. Jpn. Vol 4(4)
• 作者: F.Izawa;S.Ozawa;A.Tsukamoto;K.Nakagawa;A.Itoh
• 通讯作者: A.Itoh

Small Grain FePt Films Prepared by Rapid Thermal Annealing

快速热退火制备小晶粒 FePt 薄膜

• 发表时间: 2005
• 期刊: Technical Report Of IEICE Vol 29(39)
• 作者: A.Itoh;Y.Itoh;A.Tsukamoto;K.Nakagawa
• 通讯作者: K.Nakagawa

Dynamic Observation of Domain Shrinking Speed Over Walker's Limit

超过沃克极限的域收缩速度的动态观测

• 发表时间: 2004
• 期刊: Trans. Magn. Soc. Jpn. 4巻4号
• 作者: F.Izawa;S.Ozawa;A.Tsukamoto;K.Nakagawa;A.Itoh
• 通讯作者: A.Itoh

Excitation of coherent spin waves at ultrafast thermomagnetic writing

• DOI: 10.1109/tmag.2004.834201
• 发表时间: 2004-08
• 期刊: IEEE Transactions on Magnetics
• 影响因子: 2.1
• 作者: A. Tsukamoto;K. Nakagawa;A. Itoh;A. Kimel;A. Tsvetkov;H. Awano;N. Ohta;A. Kirilyuk;T. Rasing

Magnetic Characteristics of TbFeCo Fabricated on Isolated FePt Thin Film

孤立 FePt 薄膜上制备的 TbFeCo 的磁特性

• 发表时间: 2004
• 期刊: Trans. Magn. Soc. Jpn. Vol 4(4)
• 作者: Y.Itoh;A.Tsukamoto;K.Nakagawa;A.Itoh
• 通讯作者: A.Itoh