Deterministic, Reversible, and Nonvolatile Low-Voltage Writing of Magnetic Domains in Epitaxial BaTiO3/Fe3O4 Heterostructure

Gaokuo Zhong, Feng An, Yugandhar Bitla, Jinbin Wang, Xiangli Zhong, Junxi Yu, Wenpei Gao, Yi Zhang, Congbing Tan, Yun Ou, Jie Jiang, Ying Hui Hsieh, Xiaoqing Pan, Shuhong Xie, Ying-hao Chu*, Jiangyu Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The ability to electrically write magnetic bits is highly desirable for future magnetic memories and spintronic devices, though fully deterministic, reversible, and nonvolatile switching of magnetic moments by electric field remains elusive despite extensive research. In this work, we develop a concept to electrically switch magnetization via polarization modulated oxygen vacancies, and we demonstrate the idea in a multiferroic epitaxial heterostructure of BaTiO3/Fe3O4 fabricated by pulsed laser deposition. The piezoelectricity and ferroelectricity of BaTiO3 have been confirmed by macro- and microscale measurements, for which Fe3O4 serves as the top electrode for switching the polarization. X-ray absorption spectroscopy and X-ray magnetic circular dichroism spectra indicate a mixture of Fe2+ and Fe3+ at Oh sites and Fe3+ at Td sites in Fe3O4, while the room-temperature magnetic domains of Fe3O4 are revealed by microscopic magnetic force microscopy measurements. It is demonstrated that the magnetic domains of Fe3O4 can be switched by not only magnetic fields but also electric fields in a deterministic, reversible, and nonvolatile manner, wherein polarization reversal by electric field modulates the oxygen vacancy distribution in Fe3O4, and thus its magnetic state, making it attractive for electrically written magnetic memories.

Original languageEnglish
Pages (from-to)9558-9567
Number of pages10
JournalACS Nano
Volume12
Issue number9
DOIs
StatePublished - 25 Sep 2018

Keywords

  • FeO
  • low-voltage writing
  • magnetoelectric coupling
  • multiferroic heterostructure
  • oxygen vacancies

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