Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2016 Apr 19:6:24568.
doi: 10.1038/srep24568.

Orbital Reconstruction Enhanced Exchange Bias in La0.6Sr0.4MnO3/Orthorhombic YMnO3 Heterostructures

Dongxing Zheng  1 , Chao Jin  1 , Peng Li  1 , Liyan Wang  1 , Liefeng Feng  1 , Wenbo Mi  1 , Haili Bai  1
Affiliations

Orbital Reconstruction Enhanced Exchange Bias in La0.6Sr0.4MnO3/Orthorhombic YMnO3 Heterostructures

Dongxing Zheng et al. Sci Rep. .

Abstract

The exchange bias in ferromagnetic/multiferroic heterostructures is usually considered to originate from interfacial coupling. In this work, an orbital reconstruction enhanced exchange bias was discovered. As La0.6Sr0.4MnO3 (LSMO) grown on YMnO3 (YMO) suffers a tensile strain (a > c), the doubly degenerate eg orbital splits into high energy 3z(2) - r(2) and low energy x(2) - y(2) orbitals, which makes electrons occupy the localized x(2) - y(2) orbital and leads to the formation of antiferromagnetic phase in LSMO. The orbital reconstruction induced antiferromagnetic phase enhances the exchange bias in the LSMO/YMO heterostructures, lightening an effective way for electric-field modulated magnetic moments in multiferroic magnetoelectric devices.

PubMed Disclaimer

Figures

Figure 1
Figure 1
M-H curves of the (a) YMO/LSMO/STO and (b) LSMO/YMO/STO heterostructures with different lattice orientations. (c) Temperature-dependent EB field in the YMO/LSMO/STO heterostructures with different lattice orientations. The inset shows the temperature-dependent EB field in the LSMO/YMO/STO heterostructures. (d) Temperature-dependent ΔHEB with different lattice orientations.
Figure 2
Figure 2
ZFC and FC curves of the LSMO/YMO/STO and YMO/LSMO/STO heterostructures with (a,d) (001), (b,e) (011) and (c,f) (111) orientations. The inset gives the M-T curve of the LSMO(001) single layer.
Figure 3
Figure 3
Temperature dependent EB field in the LSMO(001)/YMO/STO heterostructures with different (a) LSMO and (b) YMO thicknesses, the inset shows the YMO thickness dependent EB field at 5 K.
Figure 4
Figure 4
HRTEM images of the (a,d) LSMO(001)/YMO and YMO/LSMO(001) interfaces, corresponding to (b,e) LSMO layers and (c,f) SAED patterns of the LSMO/YMO/STO and YMO/LSMO/STO heterostructures.
Figure 5
Figure 5
Orbital reconstruction of LSMO layers in the heterostructures, top panel: representation of the MnO6 octahedral distortions as a function of strain; middle panel: orbital reconstruction of the eg orbitals of Mn ions; bottom panel: calculated density states of Mn ions.
See this image and copyright information in PMC

References

    1. Zheng H. et al.. Multiferroic BaTiO3-CoFe2O4 Nanostructures. Science 303, 661–663 (2004). - PubMed
    1. Caviglia A. D., Gabay M., Gariglio S., Reyren N., Cancellieri C. & Triscone J. M. Tunable Rashba spin-orbit interaction at oxide interfaces. Phys. Rev. Lett. 104, 126803 (2010). - PubMed
    1. Chu Y. H. et al.. Electric-field control of local ferromagnetism using a magnetoelectric multiferroic. Nat. Mater. 7, 478–482 (2008). - PubMed
    1. Skumryev V. et al.. Magnetization reversal by electric-field decoupling of magnetic and ferroelectric domain walls in multiferroic-based heterostructures. Phys. Rev. Lett. 106, 057206 (2011). - PubMed
    1. Laukhin V. et al.. Electric-field control of exchange bias in multiferroic epitaxial heterostructures. Phys. Rev. Lett. 97, 227201 (2006). - PubMed

Publication types