development of field ion-magnetic force microscope (FI-MFM) and its application to surface magnetism

在本研究项目中，我们开发了一个磁力显微镜（MFM）结合场离子显微镜（EIM）的尖端表征和修改，使用该系统，我们研究了表面磁性。为了获得高性能的MFM，对针尖的表征是非常重要的，因此我们利用原子探针场离子显微镜（Atomprobefieldionmicroscope，APPEMS）以原子尺度的空间分辨率研究了针尖中的元素分布.我们开发了一个高性能的STM结合的针尖表征。为了检验其性能，我们观察了金属表面的STM图像，并成功地实现了原子分辨率。我们还研究了吸附诱导的重构表面结构使用该系统。这些结果在一些综述论文中进行了总结。Mn/Cu（001）体系表面磁性研究：从物理角度看，表面磁性是一个很有吸引力的课题，但它与原子结构的关系还没有得到很好的理解。本文利用STM研究了Mn/Cu（001）体系表面磁性与原子结构的关系。超过一个临界厚度，Mn吸附物交换其位置与Cu原子在衬底中，形成c（2 × 2）相，直到半单层。c（2x2）结构的波纹没有LEED报道的那么多，我们的结果与LEED的结果相矛盾，LEED的结果认为Mn原子突出是因为原子间的铁磁相互作用.薄膜和AP-XRD表征MFM针尖：精确表征针尖尖端的自旋态和磁性是必然的。为此，我们对磁性材料针尖进行了原子探针分析，研究了纳米尺度的磁畴分布。

In this research project, we have developed an magnetic force microscope (MFM) combined with field ion microscope (FIM) for tip characterization and modification, using the system, we studied on surface magnetism. For a high performance of MFM, it is very important to characterize a tip, and thus we studied elemental distribution in the tip with an atomic scale spatial resolution using atom probe field ion microscope (APFIM).1. We developed a high performance STM combined with FIM for tip characterization. In order to check its performance, we observed STM images on metal surfaces and successfully achieved atomic resolution. We also studied adsorbate-induced reconstructed surface structures using the system. Those results are summerized in some review papers.2. study on surface magnetism on Mn/Cu(001) system :Surface magnetism is quite attractive subject in a physical point of view, but its relation with atomic structure have not been really understood well, In this study, we tried to investigate a relation of magnetic properties and atomic structure of surfaces using STM.Based on STM observation, we found that Mn atoms forms clusters in an initial stage of adsorption. Above a critical thickness, Mn adsorbate exchange its site with Cu atoms in the substrate, forming c(2x2) phase, until a half monolayer. Corrugation of the c(2x2) structure is not so much as reported with LEED.Our results are contradictory with the LEED results, which claims that Mn atoms protrude because of ferromagnetic interaction among the atoms.3. characterization of MFM tip by FILM and AP-FIM :It is inevitable to characterize precisely spin states and magnetic properties of tip apex. For the parposes, we performed atom probe analysis of magnetic material tip and studied a distribution of magnetic domains with nanometer scale spatial resolution.