Ferroelectric control of interface spin filtering in multiferroic tunnel junctions

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Gallego Toledo, Fernando
Hernández Martín, David
Cuéllar Jiménez, Fabián Andrés
Arias Serna, Diego
Sefriuoi, Zouhair
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American Physical Society
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The electronic reconstruction occurring at oxide interfaces may be the source of interesting device concepts for future oxide electronics. Among oxide devices, multiferroic tunnel junctions are being actively investigated as they offer the possibility to modulate the junction current by independently controlling the switching of the magnetization of the electrodes and of the ferroelectric polarization of the barrier. In this Letter, we show that the spin reconstruction at the interfaces of a La_0.7Sr_0.3MnO_3/BaTiO_3/La_0.7Sr_0.3MnO_3 multiferroic tunnel junction is the origin of a spin filtering functionality that can be turned on and off by reversing the ferroelectric polarization. The ferroelectrically controlled interface spin filter enables a giant electrical modulation of the tunneling magnetoresistance between values of 10% and 1000%, which could inspire device concepts in oxides-based low dissipation spintronics.
© 2019 American Physical Society Artículo firmado por más de once autores. Authors acknowledge received funding from the project Quantox of QuantERA ERA-NET Cofund in Quantum Technologies (Grant Agreement No. 731473) implemented within the European Union's Horizon 2020 Programme. This work was supported by Spanish MINECO through Grants No. MAT2014-52405-C02, No. MAT2017-87134-C02, No. MAT2015-72795-EXP, and by Comunidad de Madrid through S2013/336 MIT-2740. Work at Argonne National Laboratory (PNR experiments and analysis) was supported by the U.S. DOE, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. The neutron scattering experiment was conducted at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. Beam time support provided at Alice (BMBF Project No. 05K10PC2) is acknowledged. Financial support for developing and building the PM2-VEKMAG beam line and VEKMAG end station was provided by HZB and BMBF (05K10PC2, 05K10WR1, 05K10KE1), respectively. Steffen Rudorff is acknowledged for technical support. J. S. thanks Scholarship program Alembert funded by the IDEX Paris-Saclay, ANR-11-IDEX-0003-02.