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S. M. Winter, S. Datta, S. Hill, R. T. Oakley, J. Am. Chem. Soc. 133 , 8126 (2011).

Magnetic Anisotropy in a Heavy Atom Organic Radical Ferromagnet Stephen O. Hill, Florida State University, DMR 0804408.

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S. M. Winter, S. Datta, S. Hill, R. T. Oakley, J. Am. Chem. Soc. 133 , 8126 (2011).

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  1. Magnetic Anisotropy in a Heavy Atom Organic Radical FerromagnetStephen O. Hill, Florida State University, DMR 0804408 The electronic properties of purely organic compounds have been studied as potential alternatives to traditional device materials (Si, Cu, etc..). This interest has been driven by the advantages that such materials offer in terms of their light weight, bio-compatibility, and the tremendous control that synthetic methods provide. The recent report of hard ferromagnetism in a selenazyl radical with a record TC=17K and coercivity (HC= 0.137T) represents a major breakthrough. We have employed ferromagnetic resonance to reveal an anisotropy field that is comparable to hcp cobalt, and orders of magnitude stronger than other light-heteroatom organic magnets. We demonstrate conclusively via a perturbative approach that these properties arise due to significant spin-orbit mediated exchange anisotropy associated with the heavy Se atom, suggesting that there may be room for significant further development of heavy p-block organic magnets. (Left) Three types of electronic transition induced by the anisotropic spin-orbit interaction. (Right) Orthogonal overlap of the radical SOMOs along the π-stacks. S. M. Winter, S. Datta, S. Hill, R. T. Oakley, J. Am. Chem. Soc. 133, 8126 (2011). Anisotropic ferromagnetic resonance response.

  2. Magnetic Anisotropy in a Heavy Atom Organic Radical Ferromagnet Stephen O. Hill, Florida State University, DMR 0804408 Under a separate award (CHE0924374), a method has been developed to perform high-field/frequency Electron Paramagnetic Resonance (EPR) measurements of single-crystal samples under hydrostatic pressures of up to 30 kbar. This new capability has played an important role in this DMR project, with the first results presented at an international workshop in April 2010. This technique is of particular interest to users of the NHMFL working in the area of low-dimensional magnetism. Indeed, the results shown left resulted from a collaboration that was initiated by a NHMFL user (John Schlueter, Argonne National Lab). CuF2(pyz)(H2O)2 a b a c (Upper figure) Pressure dependence of the g-tensor for a 2D molecular magnetic framework material. (Lower figure) Chelsey Morien presents her results at the International School and Symposium on Multifunctional Molecule-based Materials at Argonne National Lab, March, 2011.

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