Magnetisation Density Mapping of Strongly Delocalized Giant Spin Hexa-iron Clusters Exhibiting Superparamagnetism
Superparamagnetic metal clusters are of fundamental interest due to the quantum origin of their magnetic behavior, and they have been proposed for use in information storage and spintronics devices, but the small size of the spin reversal energy barriers limits applications. 1-D coordination polymers containing anisotropic paramagnetic molecules also exhibit spin reversal barriers whose magnitude depends on the spin state of the component molecules and the strength of the intrachain magnetic exchange. Thus, 1-D exchange coupled systems containing giant-spin metal clusters could exhibit higher spin reversal barriers. We have prepared a series of clusters that are uniquely suited to this challenge, featuring strong exchange leading to the highest reported thermally isolated spin ground states. We propose to map the spin density within the clusters using polarized neutron diffraction to gain insight into the role of electronic delocalization and short metal-metal distances in promoting the strong magnetic exchange and to better predict how the clusters will behave as building blocks in magnetic materials.
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BETLEY Theodore; Kevin J. Anderton; Caņadillas-Delgado, L.; RODOLPHE CLERAC; Rebecca A. Musgrave; OYARZABAL EPELDE Itziar; PERLEPE Panagiota and STUNAULT Anne. (2018). Magnetisation Density Mapping of Strongly Delocalized Giant Spin Hexa-iron Clusters Exhibiting Superparamagnetism. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-51-526
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