Spin-flop Coupling at La0.5Sr0.5FeO3/La0.7Sr0.3MnO3 Interfaces

ORAL

Abstract

Antiferromagnetic (AFM) spintronics have gained the scientific community’s interest due to promising characteristics such as high storage capacity and faster processing speed, however, challenges remain for the reorientation of AFM moments with moderate magnetic fields and performing spin transport measurements. In this study, we showed that spin-flop coupling, the perpendicular coupling between ferromagnetic (FM) and AFM moments, at (001)-interfaces of La0.5Sr0.5FeO3 (LSFO)/La0.7Sr0.3MnO3 (LSMO) bilayers can be utilized to reorient the AFM moments with moderate magnetic field in the scale of tenths of a tesla. Compressively strained epitaxial LSFO/LSMO bilayers with fixed LSMO thickness (<!--[if gte msEquation 12]> style='mso-bidi-font-style:normal'>~85-unit cell (u.c.)) were investigated to understand the effect of Sr-doping in La1-xSrxFeO3 and LSFO layer thickness (varying from 10 to 70 u.c.) on the spin-flop coupling strength. X-ray magnetic linear dichroism revealed that the spin-flop coupling strength decreased with increasing LSFO layer thickness, vanishing at 70 u.c., when the LSFO magnetocrystalline anisotropy overcame the spin-flop coupling strength. Additionally, photoemission electron microscopy revealed a domain-by-domain correlation between FM and AFM moments as dictated by spin-flop coupling.

* This project was funded by the National Science Foundation Award (DMR-2004704). This research used resources of the Advanced Light Source, which is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the US Department of Energy under Contract No. DE-AC02-05CH11231.

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Presenters

  • Ishmam Nihal

    University of California, Davis

Authors

  • Ishmam Nihal

    University of California, Davis

  • Dayne Y Sasaki

    University of California, Davis, University of California Davis, Davis

  • Mingzhen Feng

    University of California, Davis, University of California Davis, University of Calilfornia, Davis

  • Christoph Klewe

    Lawrence Berkeley National Laboratory, Advanced light source

  • Padraic Shafer

    Lawrence Berkeley National Lab, Lawrence Berkeley National Laboratory, Brookhaven National Laboratory, University of California, Davis

  • Andreas Scholl

    Lawrence Berkeley National Laboratory

  • Yayoi Takamura

    University of California, Davis