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Title: Optical diode effect at spin-wave excitations in the room-temperature multiferroic BiFeO3.

The ability to read and write a magnetic state current-free by an electric voltage would provide a huge technological advantage. Dynamic or optical ME effects are equally interesting, because they give rise to unidirectional light propagation as recently observed in low-temperature multiferroics. This phenomenon, if realized at room temperature, would allow the development of optical diodes which transmit unpolarized light in one, but not in the opposite, direction. Here, we report strong unidirectional transmission in the room-temperature multiferroic BiFeO3 over the gigahertz-terahertz frequency range. The supporting theory attributes the observed unidirectional transmission to the spin-current-driven dynamic ME effect. Our findings are an important step toward the realization of optical diodes, supplemented by the ability to switch the transmission direction with a magnetic or electric field.
 [1] ;  [2] ;  [1] ;  [3] ;  [3] ;  [4] ;  [4] ;  [2]
  1. Budapest University of Technology and Economics (Hungary)
  2. National Institute of Chemical Physics and Biophysics, Tallinn (Estonia)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Rutgers Univ., Piscataway, NJ (United States)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 115; Journal Issue: 12; Journal ID: ISSN 0031-9007
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States