Department of Chemistry and Chemical Biology, School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.
Nano Lett. 2011 Dec 14;11(12):5367-72. doi: 10.1021/nl202950h. Epub 2011 Nov 7.
We used a fluorescent chemical indicator of magnetic field to visualize the magnetic field around ferromagnetic nanostructures. The indicator was a chain-linked electron donor-acceptor molecule, phenanthrene-(CH2)12-O-(CH2)2-dimethylaniline, that forms spin-correlated radical pairs upon photoexcitation. The magnetic field altered the coherent spin dynamics, yielding an 80% increase in exciplex fluorescence in a 0.1 T magnetic field. The magnetic field distributions were quantified to precision of 1.8×10(-4) T by image analysis and agreed with finite-element nanomagnetic simulations.
我们使用荧光磁场指示剂来可视化铁磁纳米结构周围的磁场。该指示剂是一个链状的电子给体-受体分子，即菲-(CH2)12-O-(CH2)2-二甲基苯胺，它在光激发时形成自旋相关的自由基对。磁场改变了相干自旋动力学，在 0.1 T 磁场中使激基复合物荧光增加了 80%。通过图像分析将磁场分布定量到 1.8×10(-4) T 的精度，与有限元纳米磁模拟结果一致。
