Tailoring Magnetoelectric Coupling in BiFeO 3 /La 0.7 Sr 0.3 MnO 3 Heterostructure through the Interface Engineering

Di Yi*, Pu Yu, Yi Chun Chen, Hsin Hua Lee, Qing He, Ying-hao Chu, Ramamoorthy Ramesh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Electric field control of magnetism ultimately opens up the possibility of reducing energy consumption of memory and logic devices. Electric control of magnetization and exchange bias are demonstrated in all-oxide heterostructures of BiFeO 3 (BFO) and La 0.7 Sr 0.3 MnO 3 (LSMO). However, the role of the polar heterointerface on magnetoelectric (ME) coupling is not fully explored. Here, the ME coupling in BFO/LSMO heterostructures with two types of interfaces, achieved by exploiting the interface engineering at the atomic scale, is investigated. It is shown that both magnetization and exchange bias are reversibly controlled by switching the ferroelectric polarization of BFO. Intriguingly, distinctly different modulation behaviors that depend on the interfacial atomic sequence are observed. These results provide new insights into the underlying physics of ME coupling in the model system. This study highlights that designing interface at the atomic scale is of general importance for functional spintronic devices.

Original languageEnglish
Article number1806335
JournalAdvanced Materials
Volume31
Issue number11
DOIs
StatePublished - 15 Mar 2019

Keywords

  • BiFeO
  • exchange bias
  • magnetoelectric
  • multiferroic
  • oxide interface
  • polar discontinuity

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