Magnetic phase transitions in two-dimensional films

二维薄膜中的磁相变

• 批准号: 41962-2012
• 负责人: Venus, David
• 金额: $ 1.46万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=593110
• 关键词: Magnetic; phase; transitions; two; dimensional

Even though everything has three spatial dimensions, in some cases the third dimension is so small that an object acts precisely as if it is two-dimensional. An example of this is the magnetic behaviour of an ultrathin film. A film of magnetic atoms, such as iron or nickel, that is only one atom thick can be deposited on a substrate that is non-magnetic. The magnetic behaviour of the film is profoundly affected by its two-dimensionality, especially with regard to the possible stable magnetic states, their orientation, and range of stability as the temperature is changed. This proposal aims to study magnetism in two-dimensional ultrathin magnetic films grown in ultrahigh vacuum and probed by magneto-optical interactions between the film magnetism and laser light. Specific projects involve fabricating and studying phase transitions in ferromagnetic films with no preferred direction of magnetization, with patterns of magnetic domains, and in antiferromagnetic films.

尽管一切事物都具有三个空间维度，但在某些情况下，第三个维度非常小，以至于物体的行为就像二维一样。超薄膜的磁性行为就是一个例子。只有一个原子厚的磁性原子薄膜，例如铁或镍，可以沉积在非磁性基底上。薄膜的磁性行为深受其二维性的影响，特别是在温度变化时可能的稳定磁态、它们的方向和稳定范围方面。该提案旨在研究在超高真空中生长的二维超薄磁性薄膜中的磁性，并通过薄膜磁性与激光之间的磁光相互作用进行探测。具体项目涉及制造和研究没有首选磁化方向、具有磁畴图案的铁磁薄膜以及反铁磁薄膜中的相变。