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.

尽管一切都有三维空间，但在某些情况下，第三维是如此之小，以至于一个物体的行为就像它是二维的。这方面的一个例子是磁性薄膜的磁性行为。一层只有一个原子厚的磁性原子膜，如铁或镍，可以沉积在非磁性的基底上。薄膜的磁性行为受到其二维性的深刻影响，特别是在温度变化时可能的稳定磁性状态、取向和稳定范围方面。本计画旨在研究在真空中生长的二维磁性薄膜的磁性，并利用薄膜磁性与雷射光的磁光交互作用来探讨磁性。具体项目涉及制造和研究铁磁薄膜中的相变，没有优选的磁化方向，磁畴图案，以及反铁磁薄膜。