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Magnetization Reversal by Out-of-plane Voltage in BiFeO3-based Multiferroic Heterostructures.

J J Wang1, J M Hu2, Ren-Ci Peng1

  • 1State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.

Scientific Reports
|May 22, 2015
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate out-of-plane voltage control of magnetization reversal in multiferroic heterostructures. This breakthrough offers a path toward practical, low-power spintronic devices using bismuth ferrite (BiFeO3).

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Voltage-controlled magnetization reversal is crucial for low-power spintronic devices.
  • Existing methods use in-plane voltage, limiting practical applications.
  • Bismuth ferrite (BiFeO3)-based multiferroic heterostructures show promise.

Purpose of the Study:

  • To investigate out-of-plane voltage control of magnetism in CoFe/BiFeO3 heterostructures.
  • To explore magnetization reversal in CoFe nanodots using perpendicular voltage.
  • To achieve non-volatile control via BiFeO3 nanoislands.

Main Methods:

  • Phase-field simulations were employed to model the heterostructures.
  • Investigated the effect of perpendicular voltage on CoFe/BiFeO3 interfaces.
  • Simulated magnetization reversal in CoFe nanodots and BiFeO3 nanoislands.

Main Results:

  • Out-of-plane voltage successfully controlled and reversed the in-plane magnetic moment at the CoFe/BiFeO3 interface.
  • Perpendicular voltage induced in-plane magnetization reversal in overlaying CoFe nanodots.
  • Non-volatile control was predicted by structuring BiFeO3 into nanoislands.

Conclusions:

  • Out-of-plane voltage control of magnetization reversal is feasible in BiFeO3 heterostructures.
  • This approach overcomes limitations of in-plane voltage for device applications.
  • Findings provide guidelines for developing practical electric-field controlled spintronic devices.