Magnetism at an iridate/manganite interface: Influence of strong spin-orbit interaction

Abstract

The complex investigation of dc transport and magnetic properties of the epitaxial manganite/iridate heterostructure was carried out by mean of X-ray (XRD), dc resistance measurements, ferromagnetic resonance (FMR) and polarized neutron reflectivity (PNR).Epitaxial growth of the heterostructure proceeded according to the -cube-to-cube‖ mechanism with the small lattice turn. The dc measurement indicates the presence of a conduction channel at the iridate/manganite interface due to the charge leakage from iridate that makes it hole doped, while the manganite side becomes electron doped. This is confirmed by the first principles calculations based on density functional theory [Sayantika Bhowal, and Sashi Satpathy AIP Conference Proceedings 2005, 020007 (2018)] that show the charge transfer at the interface from the half-filled spin-orbit entangled J eff = 1/2 state of the iridate to the empty e ↑g states of manganite. The neutron scattering data show the turn of magnetization vector of the heterostructure (mainly manganite) on 26 degree closer to the external field with reducing temperature down to 10K. Additional ferromagnetic state appearing at T<100K indicate on emergence of ferromagnetism in the thin (10 nm) paramagnetic SIO film close to the interface.We have measured the dc voltage aroused on the SIO film caused by spin pumping and the anisotropic magnetoresistance in the heterostructure.

Direct Observation of Strong Anomalous Hall Effect and Proximity‐Induced Ferromagnetic State in SrIrO3

“…In manganite/SIO superlattices magnetic exchange between the different layers may also result in interfacial FM properties. [26][27][28][29][30][31][32][33][34] These can in principle be probed through magnetotransport as effects such as the anomalous Hall effect (AHE) or the anisotropic magnetoresistance (AMR), two hallmarks of an FM metal, directly relate to, e.g., the magnetization, ordering temperature and anisotropy of the magnetic state and are therefore useful quantities to characterize the magnetic properties of materials.…”

Emergence of Insulating Ferrimagnetism and Perpendicular Magnetic Anisotropy in 3d–5d Perovskite Oxide Composite Films for Insulator Spintronics

“…2(d), indicating that the observed AHE is closely related to the PMA of LSMIO composite films. We note that interfacial magnetism and AHE has been intensively studied in LSMO/SIO superlattices and heterostructures 21,[40][41][42][43][44][45][46] . Our observed AHE is quite different from that the AHE reported in ref.…”

Complementary Insights from Neutron and Resonant X‐Ray Reflectometry for the Study of Perovskite Transition Metal Oxide Heterostructures

“…These requirements are met at several instruments around the globe, where it is possible to perform NR of oxide heterostructures. Some recent examples come from studies carried out at large-scale facilities such as FRM II, [35][36][37] ILL, [38] SINQ, [39] ISIS, [40] SNS, [41,42] and NIST. [43][44][45] To demonstrate this important, complementary aspect of Xrays and neutrons, we show simulations for a hypothetical SrVO 3 =SrCrO 3 SL structure in Figure 2.…”

“…These requirements are met at several instruments around the globe, where it is possible to perform NR of oxide heterostructures. Some recent examples come from studies carried out at large‐scale facilities such as FRM II, [ 35–37 ] ILL, [ 38 ] SINQ, [ 39 ] ISIS, [ 40 ] SNS, [ 41,42 ] and NIST. [ 43–45 ]…”