Proximity-Induced Novel Ferromagnetism Accompanied with Resolute Metallicity in NdNiO3 Heterostructure.

Marco Caputo,Jasmin Jandke,Eduardo B Guedes,Muntaser Naamneh,Joël Mesot,Milan Radović,Marisa Medarde,Zoran Ristic,Christan E Matt,Anna Zakharova,Tanmoy Das,Nicholas C Plumb,Luc Patthey,Zhiming Wang,Cinthia Piamonteze,Ming Shi,Rajendra S Dhaka

doi:10.1002/advs.202101516

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 NdNiO3 (NNO) film in proximity to ferromagnetic (FM) La0.67Sr0.33MnO3 (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 RENiO3 (RE = rare‐earth element).

Highlights

We report the emergence of a ferromagnetic phase in NNO thin films in proximity with the ferromagnetic metal (FM-M) La0.67Sr0.33MnO3 (LSMO) layer, as confirmed by X-ray magnetic circular dichroism (XMCD) on the Ni edge
All samples were grown by pulsed laser deposition (PLD): growth and transport details are in the ref. [21] and Supporting Information
We studied the emergence of the ferromagnetic phase and its influence on the electronic structure in nickelate thin film in www.advancedscience.com proximity to the magnetic layer

Summary

Introduction

We report the emergence of a ferromagnetic phase in NNO thin films in proximity with the ferromagnetic metal (FM-M) La0.67Sr0.33MnO3 (LSMO) layer, as confirmed by X-ray magnetic circular dichroism (XMCD) on the Ni edge. Some of the co-authors of this work already reported the comprehensive temperature dependence of EDCs and MDCs from 20 u.c. NNO grown on NGO (110).[21] By contrast, the spectral weight near EF in NNO/LSMO for cut#1 and cut#2 remains at low temperature forming a clear Fermi step.

Results

Conclusion