Pressure-tuning of the photomagnetic response of heterostructured CoFe@CrCr-PBA core@shell nanoparticles

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• 作者：Marcus K. Peprah^a ; Derrick VanGennep^a ; Pedro A. Quintero^a ; Oliva N. Risset^b ; Tatiana V. Brinzari^a ; Carissa H. Li^b ; Matthieu F. Dumont^a ; Jian-sheng Xia^a ; James J. Hamlin^a ; Daniel R. Talham^b ; ^{talham@chem.ufl.edu} ; Mark W. Meisel^a ; ^{meisel@phys.ufl.edu}
• 关键词：Core&ndash ; shell nanoparticles ; Heterostructures ; Prussian blue analogues ; Photomagnetism ; High pressure
• 刊名：Polyhedron
• 出版年：2017
• 出版时间：17 February 2017
• 年：2017
• 卷：123
• 期：Complete
• 页码：323-327
• 全文大小：620 K
• 卷排序：123

文摘

Using a home-made, anvil pressure-cell mounted to a probe suitable for use with a commercial magnetometer, the photo and thermal responses of the magnetism of CoFe@CrCr-PBA (PBA = Prussian blue analogue) core@shell nanoparticles were studied down to 5 K and up to 0.5 GPa in 100 G. The effect of pressure on the magnetic ordering temperatures of the CoFe-PBA core (≈25 K) and the CrCr-PBA shell (≈200 K) along with a shift of the relaxation temperature of the photo-CTIST (charge-transfer-induced spin-transition) of the CoFe-PBA core (≈125 K), were similar to the behaviors reported for the single-phase materials. Specifically, although the magnetic ordering temperature of the CrCr-PBA shell shifted to higher temperatures, the relaxation temperature of the photo-CTIST of the CoFe-PBA core moved to lower temperatures when the pressure was increased, thereby lowering the temperature range under which the CrCr-PBA component can be photoswitched.