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Title: The Origin and Coupling Mechanism of the Magnetoelectric Effect in TM Cl 2 -4SC(NH 2 ) 2 ( TM = Ni and Co)

Most research on multiferroics and magnetoelectric effects to date has focused on inorganic oxides. Molecule-based materials are a relatively new field in which to search for magnetoelectric multiferroics and to explore new coupling mechanisms between electric and magnetic order. We present magnetoelectric behavior in NiCl 2 -4SC(NH 2 ) 2 (DTN) and CoCl 2 -4SC(NH 2 ) 2 (DTC). These compounds form tetragonal structures where the transition metal ion (Ni or Co) is surrounded by four electrically polar thiourea molecules [SC(NH 2 ) 2 ]. By tracking the magnetic and electric properties of these compounds as a function of magnetic field, we gain insights into the coupling mechanism by observing that, in DTN, the electric polarization tracks the magnetic ordering, whereas in DTC it does not. For DTN, all electrically polar thiourea molecules tilt in the same direction along the c -axis, breaking spatial-inversion symmetry, whereas, for DTC, two thiourea molecules tilt up and two tilt down with respect to c -axis, perfectly canceling the net electrical polarization. Thus, the magnetoelectric coupling mechanism in DTN is likely a magnetostrictive adjustment of the thiourea molecule orientation in response to magnetic order.
ORCiD logo [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5]
  1. National High Magnetic Field Laboratory (NHMFL), MPA-CMMS Group, Los Alamos National Laboratory (LANL), Los Alamos, NM 87545, USA, Department of Physics, Simon Fraser University, Burnaby, BC, Canada V5A 1S6
  2. Department of Chemistry and Biochemistry, Eastern Washington University, Cheney, WA 99004, USA
  3. Materials Synthesis & Integrated Devices, LANL, Los Alamos, NM 87545, USA
  4. Material Science and Technology Division, LANL, Los Alamos, NM 87545, USA
  5. National High Magnetic Field Laboratory (NHMFL), MPA-CMMS Group, Los Alamos National Laboratory (LANL), Los Alamos, NM 87545, USA
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Advances in Condensed Matter Physics
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Journal Volume: 2014; Related Information: CHORUS Timestamp: 2016-08-18 17:06:16; Journal ID: ISSN 1687-8108
Hindawi Publishing Corporation
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