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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
Published on: April 8, 2018
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Ferroelectric Control of Interface Spin Filtering in Multiferroic Tunnel Junctions.
J Tornos1, F Gallego1, S Valencia2
1GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain.
Physical Review Letters
|February 9, 2019
Summary
Interface spin reconstruction in multiferroic tunnel junctions creates a tunable spin filter. This ferroelectric control enables giant electrical modulation of tunneling magnetoresistance for low-dissipation spintronics.
Area of Science:
- Condensed matter physics
- Materials science
- Spintronics
Background:
- Oxide interfaces exhibit electronic reconstruction, offering potential for novel electronic devices.
- Multiferroic tunnel junctions (MTJs) allow current modulation via magnetization and ferroelectric polarization switching.
Purpose of the Study:
- Investigate spin reconstruction at oxide interfaces in MTJs.
- Demonstrate ferroelectric control of spin filtering functionality.
Main Methods:
- Fabrication and characterization of La_{0.7}Sr_{0.3}MnO_{3}/BaTiO_{3}/La_{0.7}Sr_{0.3}MnO_{3} MTJs.
- Analysis of interface spin reconstruction and its effect on transport properties.
Main Results:
- Observed spin reconstruction at the LSMO/BTO interfaces.
- Demonstrated a tunable spin filter effect controlled by ferroelectric polarization.
- Achieved giant electrical modulation of tunneling magnetoresistance (10% to 1000%).
Conclusions:
- Interface spin reconstruction is the origin of the spin filter functionality.
- Ferroelectric control of the spin filter enables significant modulation of magnetoresistance.
- This ferroelectric spin filter could inspire low-dissipation spintronic devices.
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