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Broader Impact:

CAREER: Magnetic Resonance - From Materials Research to Science Education Stephen Hill, University of Florida, DMR-0239481.

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Broader Impact:

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  1. CAREER: Magnetic Resonance - From Materials Research to Science EducationStephen Hill, University of Florida, DMR-0239481 We have quite literally disassembled a molecule-based nanomagnet, then reassembled it, with a view to gaining important new insights into the interactions that govern its fascinating low-temperature quantum properties. This study focuses on a simple Ni4O4 cube, which exhibits magnetic quantum tunneling below 1 K. By preparing crystals of a non-magnetic Zn4O4 analog, doped with a small quantity of Ni, we have been able to determine (by EPR) the magnetic properties of the individual NiII ions which make up the Ni4O4 molecule. This enables us to then piece the molecule back together using a fairly simple numerical model, and to compare the results with EPR data obtained for the real molecule. We find an unexpected cause of the quantum tunneling in Ni4O4, which we believe to be relevant to many other single-molecule magnets (SMMs). This work exposes limitations of widely used models for describing SMMs. Calculated energy levels for 4 coupled S = 1 NiII ions. Standard approaches to SMMs consider only the lowest 9 levels (in red). Our work highlights that one cannot neglect the remaining 72 levels. • See: E.-C. Yang et al., Inorg. Chem. 44, 3827 (2005); A. Wilson et al., cond-mat/0606252 (2006).

  2. CAREER: Magnetic Resonance - From Materials Research to Science EducationStephen Hill, University of Florida, DMR-0239481 NHMFL EMR Broader Impact: • The PI is serving as chair of internal scientific advisory committee for the Electron Magnetic Resonance (EMR) group at the NHMFL. In this capacity, the PI has been involved in developing a vision for the EMR program as part of the NHMFL five year renewal proposal. • The PI’s research group participates in regular WebCast seminars with the EMR group at the NHMFL, as well as hosting joint visitors. • The PI’s research group have developed a unique high-frequency EPR spectrometer operating to frequencies up to 670 GHz (24 T for g = 2) that is now available to users of the NHMFL. Education: Undergraduate Emmitt Thompson presented work conducted under this award at an international conference. Emmitt is pictured at his poster (top) and together with another UF undergraduate (lower) who attended the meeting.

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