GdFe0.8Ni0.2O3: A Multiferroic material for low-power spintronic devices with high storage capacity

Shu Jui Chang, Ming Han Chung, Ming Yi Kao, Shang Fan Lee, Yi Hsing Yu, Chao Cheng Kaun, Tetsuya Nakamura, Norimasa Sasabe, Shang Jui Chu, Yuan Chieh Tseng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Multiferroic materials are strong candidates for reducing the energy consumption of voltage-controlled spintronic devices because of the coexistence of ferroelectric (FE) and magnetic orders in a single phase. In this article, we present a new multiferroic perovskite, GdNixFe1-xO3 (GFNO), produced via sputtering on a SrTiO3 substrate. The proposed GFNO is FE and canted antiferromagnetic (AFM) within a monoclinic framework at room temperature. The FE polarization of the GFNO is up to 37 μC/cm2. When capped with a Co layer, the resulting heterostructure exhibits voltage-controlled magnetism (VCM). The heterostructured device exhibits two distinct features. First, its VCM depends on the magnitude as well as the polarity of the applied bias, thereby doubling the number of available magnetic readout states under a fixed voltage. Furthermore, the magnetic order of the device can be controlled very effectively within ±1 V. These two characteristics satisfy the requirements for low-power and high-storage technology. Theoretical analysis and experimental results indicate the importance of Ni dopant in regulating the polarity-dependent multiferroicity of this gadolinium ferrite system.

Original languageEnglish
Pages (from-to)31562-31572
Number of pages11
JournalACS Applied Materials and Interfaces
Volume11
Issue number34
DOIs
StatePublished - 28 Aug 2019

Keywords

  • electric-field control
  • multiferroics
  • perovskite
  • spintronics
  • Voltage-controlled magnetism

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