Probing Magnetic Exchange in Dilute Magnetic Semiconductors by Neutron Scattering

ORAL

Abstract

There is presently much interest in magnetic transition metal doped group II-VI semiconductors (A$^{\mathrm{II}}_{1-x}$Mn$_{x}$B$^{\mathrm{VI}}$). It is theorized making them strongly p-type would allow materials to remain ferromagnetic at room temperature. Since this interaction must compete with the intrinsic antiferromagnetism of the material, neutron scattering experiments were undertaken to better understand the antiferromagnetic interactions in these materials. Primarily, the study focused on the effects altering the distance between magnetic atom has on the exchange interaction. Inelastic neutron scattering was undertaken to determine the exchange constant in various materials while neutron diffraction was used to determine the distances involved in the exchange interaction. There appears to be an overall distance dependance in the materials, but high pressure studies undertaken show the functionality differers between the overall trend and the individual materials. Results will be discussed for Zn(Mn)O, Zn(Mn)S, Zn(Mn)Se, Zn(Mn)Te, and Cd(Mn)Te. The data taken is also analyzed to determine more distant interactions.

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Authors

  • Zachary Wiren

    National Institute of Standards and Technology Center for Neutron Research, Physics Department, Oregon State University

  • Tomasz Giebultowicz

    Physics Department, Oregon State University

  • Ernest Henley

    Green River College, University of British Columbia, Pacific Northwest National Laboratory, BYU-Idaho Dept. of Physics, University of Washington, Applied Physics Technologies, Inc., Montana State University, Universidade Estadual de Campinas, Southern Oregon University, Oregon State University Department of Physics, Oregon State University Department of Chemistry, National Institute of Standards and Technology Center for Neutron Research, Physics Department, Oregon State University, University of Idaho, University of Wyoming, Department of Physics, Montana State University, University of Portland, Idaho State University, WWU, Advanced Light Source, Lawrence Berkeley National Laboratory, Oregon Center for Optics and Department of Physics, University of Oregon, Lewis and Clark, Queen's University, University of Notre Dame, Idaho National Lab, TRIUMF, RCNP, Japan, University of Guelph, Mexico University, St. Mary's University, University of Montreal, Deep River, Dept. of Physics; Montana State University, Dept. of Plant Sciences and Pathology, Dept. of Chem. and Biochem.; Montana State University, Department of Physics, Shandong University, P. R. China, Department of Physics, University of Idaho, USA, Dept. of Physics, Simon Fraser University, Burnaby, BC V5A 1S6 Canada, University of Calgary

  • Ernest Henley

    Green River College, University of British Columbia, Pacific Northwest National Laboratory, BYU-Idaho Dept. of Physics, University of Washington, Applied Physics Technologies, Inc., Montana State University, Universidade Estadual de Campinas, Southern Oregon University, Oregon State University Department of Physics, Oregon State University Department of Chemistry, National Institute of Standards and Technology Center for Neutron Research, Physics Department, Oregon State University, University of Idaho, University of Wyoming, Department of Physics, Montana State University, University of Portland, Idaho State University, WWU, Advanced Light Source, Lawrence Berkeley National Laboratory, Oregon Center for Optics and Department of Physics, University of Oregon, Lewis and Clark, Queen's University, University of Notre Dame, Idaho National Lab, TRIUMF, RCNP, Japan, University of Guelph, Mexico University, St. Mary's University, University of Montreal, Deep River, Dept. of Physics; Montana State University, Dept. of Plant Sciences and Pathology, Dept. of Chem. and Biochem.; Montana State University, Department of Physics, Shandong University, P. R. China, Department of Physics, University of Idaho, USA, Dept. of Physics, Simon Fraser University, Burnaby, BC V5A 1S6 Canada, University of Calgary

  • Zachary Wiren

    National Institute of Standards and Technology Center for Neutron Research, Physics Department, Oregon State University