On-chip terahertz characterization of the antiferromagnet CaFe<sub>2</sub>O<sub>4</sub>

ORAL

Abstract

We report on the magnetic excitations of the antiferromagnet CaFe2O4 as measured with time-domain terahertz spectroscopy via an on-chip device. This material has been previously measured with a free-space terahertz apparatus, showing a magnon excitation at ~725 GHz below the material’s Neel temperature of 200 K. We have observed a possible first-order phase transition between 60 K and 120 K, indicating the coexistence of two different magnetic phases. For this experiment the material was measured with a device that generates a terahertz pulse confined to a transmission line. We report on the results of this experiment.

*Funding for this research was provided by the Center for Emergent Materials: an NSF MRSEC under award number DMR-1420451

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Presenters

  • Daniel Heligman

    • Ohio State Univ - Columbus

Authors

  • Daniel Heligman

    • Ohio State Univ - Columbus

  • Rachel Resnick

    • Ohio State Univ - Columbus

  • Lunyong Zhang

    • Laboratory for Pohang Emergent Materials and Max Plank POSTECH Center for Complex Phase Materials, Pohang University of Science and Technology, Pohang 790-784, Korea
    • Laboratory for Pohang Emergent Materials and Max Plank POSTECH Center for Complex Phase Materials, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
    • Max Planck Institute for Chemical Physics of Solids

  • Jae Wook Kim

    • Physics and Astronomy, Rutgers University
    • Department of Physics and Astronomy, Rutgers University

  • Sang-Wook Cheong

    • Rutgers University
    • R-CEM & Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
    • Rutgers Center for Emergent Materials, Rutgers University
    • Department of Physics and Astronomy, Center for Emergent Materials, Rutgers University; Max Planck POSTECH/Korea Research Initiative, Pohang University of Science and Technol
    • Physics and Astronomy, Rutgers University
    • Rutgers University, Physics and Astronomy, and Laboratory for Pohang Emergent Materials and Max Plank POSTECH Center for Complex Phase Materials, Pohang University of Science
    • Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
    • Rutgers University, Piscataway
    • Department of Physics and Astronomy, Rutgers University, New Brunswick
    • Department of Physics and Astronomy, Rutgers University
    • Department of Physics, Rutgers University
    • Physics & Astronomy, Rutgers University
    • Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University
    • Rutgers University, New Brunswick
    • Physics, Rutgers University
    • Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA

  • Rolando Valdes Aguilar

    • Ohio State Univ - Columbus
    • Ohio State Univ
    • Physics, The Ohio State University
    • Ohio State University
    • Department of Physics, The Ohio State University