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Physical Properties of Artificial Metallic Superlattices

人造金属超晶格的物理性质

基本信息

批准号：
60460032
负责人：
SHINJO Teruya
金额：
$ 4.48万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1987
项目状态：
已结题

项目摘要

By ultrahigh veacuum deposition method, multilayered films with artificial superstructures have been prepared from various combinations of metallic elements. It has been confirmed that structures are able to be controlled on an atomic scale in various cases. It is thus possible to synthesize model systems for various fundamental researches.It was found that Mn atoms deposited onto Sb surface react to form a ferromagnetic MnSb compound layer. If the nominal thickness of Mn is 1<Ang>, a ferromagnetic monolayer of Mn epitaxially stacked in between Sb layers is obtained. The easy direction of the magnetization is in perpendicular to the film plane. As examples of multilayers consisting of magnetic elements, Fe-Dy and Fe-Nd multilayers have been prepared. If the individual layer thickness is less than 20<Ang>, the structure is amorphous and the Curie temperature is normally lower than room termperature. An interesting spin reorientation phenomenon was observed in Fe(44<Ang>-Nd(6<Ang>; The magnetization in the plane at 300K turns gradually to the direction along the normal with the decrease of temperature.The utility of synchrotron X-ray has been revealed to study the complicated structure of Fe-Mn multilayers. The magnetic properties of multilayers consisting of thin Fe and thick Mn layers may be regarded as a mictomagnetism; i.e. weak ferromagnetic Fe-rich layers(amorphous ) are coupled through the antiferromagnetic interaction fo Mn layer.Superconducting properties of multilayers are investigated with combining V and Ag or V and Si. Dimensional crossover phenomenon was observed in the temperature dependences of critical field. In both cases, the transition temperature decreases with decrease of V layer thickness although there had been some speculation that an interface effect might raise the transition temperature.

采用超高真空沉积方法，从不同的金属元素组合中制备了具有人工超结构的多层膜。已经证实，在各种情况下，结构都能够在原子尺度上进行控制。研究发现，沉积在Sb表面的Mn原子发生化学反应，形成铁磁性的MnSb化合物层。如果锰的标称厚度为1，则得到外延堆积在Sb层之间的铁磁性单分子膜。容易磁化的方向是垂直于薄膜平面。作为由磁性元素组成的多层膜的例子，已经制备了Fe-Dy和Fe-Nd多层膜。如果单层厚度小于20℃，则为非晶态结构，居里温度通常低于室温。在Fe(44&lt；Ang&gt；-Nd(6&lt；Ang&gt；)中观察到了有趣的自旋重取向现象，300K时平面内的磁化强度随着温度的降低逐渐向法线方向转变。同步辐射X射线在研究Fe-Mn多层膜的复杂结构中具有重要的应用价值。由薄Fe和厚Mn层组成的多层膜的磁性可视为微磁学，即弱的铁磁性富Fe层(非晶态)通过与Mn层的反铁磁相互作用而耦合。在临界场的温度依赖关系中，观察到了跨维现象。在这两种情况下，转变温度都随着V层厚度的减小而降低，尽管有人推测界面效应可能会提高转变温度。