Abstract
Bilayers of the oxide 3d ferromagnet La0.7Sr0.3MnO3 (LSMO) and the 5d paramagnet SrIrO3 (SIO) with large spin–orbit coupling (SOC) have been investigated regarding the impact of interfacial SOC on magnetic order. For the growth sequence of LSMO on SIO, ferromagnetism is strongly altered and large out-of-plane-canted anisotropy associated with lacking magnetic saturation up to 4 T has been observed. Thin bilayer films have been grown coherently in both growth sequences on SrTiO3 (001) by pulsed laser deposition and structurally characterized by scanning transmission electron microscopy and x-ray diffraction. Measurements of magnetization and field-dependent Mn L2,3 edge x-ray magnetic circular dichroism reveal changes of the LSMO magnetic order, which are strong in LSMO on SIO and weak in LSMO underneath SIO. We attribute the impact of the growth sequence to the interfacial lattice structure, which is known to influence the interfacial magnetic coupling governed by MnO6 octahedral rotations and/or distortions.
Highlights
Heterostructures of 3d transition metal oxides (TMOs) with strong electron correlation and Ir-based 5d TMOs, which have a strong spin–orbit coupling (SOC), are increasingly gaining scientific interest.1 Designing artificial heterostructures of iridates with other well-studied transition metal oxides in order to explore the interfacial coupling between 5d and 3d electrons in oxides is important, both fundamentally and for future applications, since emergent magnetic states are expected
Our results demonstrate the importance of the growth sequence for the magnetism of the La0.7Sr0.3MnO3–SrIrO3 interface with large spin orbit coupling
Bilayer samples consisting of La0.7Sr0.3MnO3 (LSMO) and SrIrO3 (SIO) layers were grown on TiO2-terminated SrTiO3 (100) substrates (STO) by pulsed laser deposition (PLD) using an excimer laser operating at 248 nm
Summary
Heterostructures of 3d transition metal oxides (TMOs) with strong electron correlation and Ir-based 5d TMOs, which have a strong spin–orbit coupling (SOC), are increasingly gaining scientific interest. Designing artificial heterostructures of iridates with other well-studied transition metal oxides in order to explore the interfacial coupling between 5d and 3d electrons in oxides is important, both fundamentally and for future applications, since emergent magnetic states are expected. Designing artificial heterostructures of iridates with other well-studied transition metal oxides in order to explore the interfacial coupling between 5d and 3d electrons in oxides is important, both fundamentally and for future applications, since emergent magnetic states are expected. There is increasing insight into the effects of large SOC induced by SrIrO3 on the magnetic order of adjacent oxide ferromagnets. It confirms the promise of controllable non-collinear interface spin textures. The soft ferromagnetism of La0.7Sr0.3MnO3 changes toward a more hard-magnetic behavior with a canted perpendicular magnetic moment and reduced saturated magnetization These changes are much stronger in La0.7Sr0.3MnO3 grown on top of SrIrO3 than for the other growth sequence. Our results demonstrate the importance of the growth sequence for the magnetism of the La0.7Sr0.3MnO3–SrIrO3 interface with large spin orbit coupling
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