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Title: Electric control of magnetism at the Fe/BaTiO3 interface

Interfacial magnetoelectric coupling (MEC) is a viable path to achieve electrical writing of magnetic information in spintronic devices. For the prototypical Fe/BaTiO3 (BTO) system, only tiny changes of the interfacial Fe magnetic moment upon reversal of the BTO dielectric polarization have been predicted so far. Here, by using X-ray magnetic circular dichroism in combination with high resolution electron microscopy and first principles calculations, we report on an undisclosed physical mechanism for interfacial MEC in the Fe/BTO system. At the Fe/BTO interface, an ultrathin FeOx layer exists, whose magnetization can be electrically and reversibly switched on-off at room-temperature by reversing the BTO polarization. The suppression / recovery of interfacial ferromagnetism results from the asymmetric effect that ionic displacements in BTO produces on the exchange coupling constants in the adjacent FeOx layer. The observed giant magnetoelectric response holds potential for optimizing interfacial MEC in view of efficient, low-power spintronic devices.
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [1] ;  [1] ;  [6] ;  [4] ;  [7] ;  [8] ;  [6] ;  [1]
  1. Politecnico di Milano, Como (Italy)
  2. National Research Council (CNR), L'Aquila (Italy)
  3. Inst. of Barcelona (ICMAB-CSIC), Catalonia (Spain)
  4. Consiglio Nazionale delle Ricerche (CNR - IOM), Trieste (Italy)
  5. Consiglio Nazionale delle Ricerche (CNR - IOM), Trieste (Italy); Univ. Federale do Rio de Janeiro, Rio de Janeiro (Brazil)
  6. Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC), Catalonia (Spain)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. Complutense de Madrid, Madrid (Spain)
  8. Consiglio Nazionale delle Ricerche (CNR - SPIN), L'Aquila (Italy)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 5; Journal ID: ISSN 2041-1723
Nature Publishing Group
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
74 ATOMIC AND MOLECULAR PHYSICS magnetism; magnetoelectric coupling; spintronics; ferroelectricity; interfaces