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 3z2 − r2 and low energy x2 − y2 orbitals, which makes electrons occupy the localized x2 − y2 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.
Highlights
The exchange bias in ferromagnetic/multiferroic heterostructures is usually considered to originate from interfacial coupling
The lattice-orientation dependent exchange bias (EB) can be attributed to the difference of the interfacial Mn3+–O2−–Mn4+ bond angle which leads to the different strength of interfacial coupling in the heterostructures[19]
To further clarify the temperature-dependent EB, the temperature-dependent EB field ΔHEB (ΔHEB = HEB(LSMO/YMO) − HEB(YMO/LSMO)) is given in Fig. 1(d), indicating that some other factors contribute to the EB in the heterostructures besides the interfacial coupling
Summary
The exchange bias in ferromagnetic/multiferroic heterostructures is usually considered to originate from interfacial coupling. Our previous study on the magnetic properties of the YMO/LSMO/STO heterostructures with different lattice orientations showed that EB strongly depends on the lattice orientations with different Mn3+–O2−–Mn4+ bond angles at the interface[19]. As shown, the magnetic properties of the LSMO/YMO/STO are quite different from those in the YMO/LSMO/STO heterostructures.
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