Crystal-Orientation-Modulated Exchange Bias in Orthorhombic-YMnO₃/La_0.6Sr_0.4MnO₃ Multiferroic Heterostructures

Abstract

The magnetic properties of the all-oxide multiferroic heterostructures composed of orthorhombic YMnO3 (YMO) with E-type antiferromagnetic and double-exchange ferromagnetic (FM) La0.6Sr0.4MnO3 (LSMO) were studied. An orientation-modulated exchange bias effect, which is related to the interfacial Mn-O-Mn bond angle, was discovered. Because of the large bond angle in YMO/LSMO(100) heterostructures, a strong exchange coupling at the interface is formed. This strong exchange coupling sustains an FM phase in YMO at the interface region. The FM phase with strong magnetocrystalline anisotropy contributes to the vertical shift and exchange bias effect in (100) orientation heterostructures. When LSMO (110) and (111) were layered with YMO, the Mn-O-Mn bond angle was reduced, leading to a weakened exchange coupling at the interface, and only a relatively small exchange bias at low temperatures was visible.

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

“…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 Mn 3+ –O 2− –Mn 4+ bond angles at the interface 19 . Herewith, after the field cooling from 350 to 5 K with an in-plane magnetic field of 1 T, the hysteresis loops were measured.…”

“…S3 ) 23 24 . The lattice-orientation dependent EB can be attributed to the difference of the interfacial Mn 3+ –O 2− –Mn 4+ bond angle which leads to the different strength of interfacial coupling in the heterostructures 19 . As a comparison, the temperature dependent EB of the LSMO/YMO/STO heterostructures is also shown in the inset of Fig.…”

“…The YMO and LSMO layer thicknesses were ∼50 and ∼12 nm, respectively. Details for the epitaxial growth of YMO and LSMO layers were referred to our previous work 19 . The lattice structures were analyzed by reciprocal space mapping ( Supplementary Fig.…”

Controlling Magnetic Properties at BiFe1−xMnxO3/La2/3Ca1/3MnO3 Interfaces by Tuning the Spatial Distribution of Interfacial Electronic States

“…Charge freedom of oxide heterointerfaces plays an important role in strongly correlated oxide heterostructures . Generally, the valence states of interfacial ions can be effectively modified by charge transfer or doping . Modifying the valence of 3d ions can significantly affect the interfacial electronic structure, particularly the occupation of the 3d‐shell levels .…”

Triggering of spin-flipping-modulated exchange bias in FeCo nanoparticles by electronic excitation

“…An enhanced coercivity and asymmetric shift in the magnetic hysteresis loop are the manifestations of EB in magnetic materials. Till date, most of the EB related applicative research is focussed to different FM-AF multilayered systems only456. However, implementation of EB in nanoparticles (NPs) instead of hundreds of ‘nm’ thick multi-layers can provide the magnetic devices much higher order of compactness.…”