Materials World Network: Designed Preparation, Characterization, Magnetic Properties of New Complex Itinerant MagnetsGordon J. Miller, Iowa State University, DMR 0806507

Favored by 375 meV

AFM

FM

NEW Ferro-(permanent) magnet; TC ≈ 230 K;

Predicted by theoretical calculations

New Compound: Zr2Fe0.87(8)Ru5.13B2

Fe1.06S: Role of “extra” Fe atoms on stability and magnetism?Stability? The extra Fe atom provides more

electrons so the Fermi level can reach a “near gap” in the energy level diagram and optimize Fe-Fe bonding;

Magnetism? “FeS” has VERY small magnetic moments, diagonal antiferromagnetic ordering; Fe1.06S has larger magnetic moments, concentric antiferromagnetically ordered rings moving out from the extra Fe atoms

Materials World Network: Designed Preparation, Characterization, Magnetic Properties of New Complex Itinerant Magnets Gordon J. Miller, Iowa State University, DMR 0806507

Education and MentoringUndergraduate Participation:Dabanjan Ghosh (ISU Undergraduate Research Assistant)

Graduate Participation:Jakoah Brgoch (Will gain training at Oak Ridge Spallation Source for neutron powder diffraction in 2011)

International ActivitiesJakoah Brgoch (June, 2009 and November, 2010): Visited RWTH-Aachen in Germany

Christian Goerens (Ph.D. student at RWTH-Aachen) visited ISU in August, 2010

(Both students presented at 2010 Gordon Research Conference in Solid-State Chemistry;

PI: Advanced Masters School in Materials, TU-München, Invited Lecturer in Feb, 2010.