Anisotropic fluoride nanocrystals modulated by facet-specific passivation and their disordered surfaces

• 来源期刊: 国家科学评论（英文版）
• 关键词: solution synthesis fluorides nanostructures magnetic properties exchange anisotropy surface effect
• 年，卷（期）: 2020,（5）
• 页码范围: 841-848
• 页数: 8页
• 语种: 英文
• DOI: 10.1093/nsr/nwaa042

摘要

Rutile-type fluorides have been proven to be active components in the context of emerging antiferromagnetic devices.However,controlled synthesis of low-dimensional,in particular two-dimensional (2D),fluorides in a predictable and deterministic manner remains unrealized because of a lack of efficient anisotropic control,which impedes their further development in reduced dimensions.We report here that altered passivation of { 110} growing facets can direct the synthesis of mtile-type fluoride nanocrystals into well-defined zero-dimensional (0D) particulates,one-dimensional (1D) rods and 2D sheets in a colloidal approach.The obtained nanocrystals show positive exchange bias and enhanced magnetic transition temperature from the coexistence of long-range antiferromagnetic order and disordered surface spins,making them strong alternatives for flexible magnetic devices and sensors.