Proximity‐Induced Novel Ferromagnetism Accompanied with Resolute Metallicity in NdNiO₃ Heterostructure

Abstract

Employing X-ray magnetic circular dichroism (XMCD), angle-resolved photoemission spectroscopy (ARPES), and momentum-resolved density fluctuation (MRDF) theory, the magnetic and electronic properties of ultrathin NdNiO 3 (NNO) film in proximity to ferromagnetic (FM) La 0.67 Sr 0.33 MnO 3 (LSMO) layer are investigated. The experimental data shows the direct magnetic coupling between the nickelate film and the manganite layer which causes an unusual ferromagnetic (FM) phase in NNO. Moreover, it is shown the metal-insulator transition in the NNO layer, identified by an abrupt suppression of ARPES spectral weight near the Fermi level (E F ), is absent. This observation suggests that the insulating AFM ground state is quenched in proximity to the FM layer. Combining the experimental data (XMCD and AREPS) with the momentum-resolved density fluctuation calculation (MRDF) reveals a direct link between the MIT and the magnetic orders in NNO systems. This work demonstrates that the proximity layer order can be broadly used to modify physical properties and enrich the phase diagram of RENiO 3 (RE = rare-earth element).

Symmetry‐Mismatch‐Induced Ferromagnetism in the Interfacial Layers of CaRuO3/SrTiO3 Superlattices

“…[ 14,15 ] In contrast, PM NdNiO 3 becomes ferromagnetic (FM) when sandwiched by La 0.67 Sr 0.33 MnO 3 layers. [ 16 ] Interfacial FM also emerges in the PM SrIrO 3 layer in proximity to the La 0.7 Sr 0.3 MnO 3 or LaCoO 3 FM layers. [ 17–19 ] These results are usually understood by the concept of magnetic proximity effect: when two oxides are in close contact, the hybridization of adjacent atomic orbitals produces low‐lying molecular orbits thus interlayer charge transfer and exchange interaction according to the Goodenough–Kanamori–Anderson rules, [ 20–22 ] transferring magnetic order from FM layer to adjacent layers.…”

Layered Ferromagnetic Structure Caused by the Proximity Effect and Interlayer Charge Transfer for LaNiO3/LaMnO3 Superlattices

“…Subsequent works showed that the exchange-bias effect generally existed in LNO/FM-oxide heterostructures, such as LNO/La 2/3 Sr 1/3 MnO 3 (LSMO) and LNO/La 2/3 Ca 1/3 MnO 3 . , These results are interesting because the PM LNO layers have generated magnetic pining to the neighboring FM layers. This implies the development of magnetic order in the LNO layers, which is usually understood by the concept of the magnetic proximity effect. − However, there is still controversy regarding the magnetic ground state of LNO layers. On the basis of the polarization-dependent resonant X-ray reflectivity (XRR) experiments, Gibert et al declared that the ultrathin (111)-LNO layer sandwiched between LMO layers was in an antiferromagnetic state with a (1/4, 1/4, 1/4) wavevector .…”