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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.

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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