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Control of magnetism of magnetic thin films and nanowires by surface chemical modification studied by the surface magnetization-induced second harmonic generation technique

通过表面磁化感应二次谐波产生技术研究表面化学修饰控制磁性薄膜和纳米线的磁性

基本信息

批准号：
15201029
负责人：
YOKOYAMA Toshihiko
金额：
$ 30.28万
依托单位：
Institute for Molecular Science (2004-2005)Okazaki National Research Institutes (2003)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

Magnetic properties of metal thin films, wires and clusters have attracted much interest in recent years. This project aimed the control of the magnetic properties by means of surface chemical techniques such as adsorption and deposition of atoms and molecules on the metal thin films. As a new powerful measurement equipment, we have prepared the system of the etization induced second harmonic generation (MSHG) method and tried to apply this technique to some interesting magnetic systems. This technique is known to be very surface sensitive and is one of the most suitable methods for the present purposes. As the other measurement techniques, we have employed the x-ray magnetic circular dichroism (XMCD) and the magneto-optical Kerr effect (MOKE).We have first investigated the Ag-coated Co/Cu(1 1 17) system, which inherently shows a magnetic easy axis along the step while the easy axis becomes the step perpendicular direction after Ag deposition. In order to understand the mechanism of the spin reorientation transition, we have measured the magnetization curves using the MSHG and have found unique curves that could not be obtained by the MOKE. By combining the XMCD and MOKE results, we have discussed the microscopic mechanism of the spin transition.We have subsequently examined the Fe films on Ni/Cu(OO1). The previous study indicated that this system shows an exchange bias, this leading to the possibility of perpendicular exchange interaction. If this is true, this is the first thin film system with perpendicular exchange interaction within single magnetic phase systems. Actually, we have found beautiful magnetization curves along the direction perpendicular to the magnetic field. This system is further being investigated by means of MOKE and XMCD.

金属薄膜、金属丝和金属团簇的磁性是近年来研究的热点。该项目旨在通过表面化学技术，如原子和分子在金属薄膜上的吸附和沉积来控制磁性。作为一种新的强有力的测量设备，我们研制了磁化感应二次谐波产生（MSHG）系统，并尝试将这项技术应用于一些有趣的磁系统。已知该技术是非常表面敏感的，并且是用于本发明目的的最合适的方法之一。作为其他测量技术，我们采用了x射线磁圆二色性（XMCD）和磁光克尔效应（MOKE）。我们首先研究了Ag包覆的Co/Cu（1117）系统，该系统固有地显示出沿台阶沿着的易磁化轴，而Ag沉积后易磁化轴变为垂直于台阶的方向。为了理解自旋重取向转变的机制，我们已经使用MSHG测量了磁化曲线，并发现了MOKE无法获得的独特曲线。结合XMCD和MOKE的结果，我们讨论了自旋跃迁的微观机制，并对Ni/Cu（OO 1）上的Fe膜进行了研究。之前的研究表明，该系统表现出交换偏差，这导致了垂直交换相互作用的可能性。如果这是真的，这是第一个在单磁相系统中具有垂直交换相互作用的薄膜系统。实际上，我们已经发现了沿垂直于磁场方向沿着的美丽磁化曲线。该系统正在进一步研究的MOKE和XMCD。