Large intrinsic magnetization in an epitaxial BiFeO3/NdGaO3system

Anomitra Sil; Devendra S. Negi; Mit H. Naik; Manish Jain; Ranjan Datta; Rajeev Ranjan; P. S. Anil Kumar

doi:10.1209/0295-5075/126/57003

All issues

Volume 126 / No 5 (June 2019)

EPL, 126 5 (2019) 57003

Abstract

Issue		EPL Volume 126, Number 5, June 2019


Article Number		57003
Number of page(s)		6
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/126/57003
Published online		05 July 2019

EPL, 126 (2019) 57003

Large intrinsic magnetization in an epitaxial BiFeO₃/NdGaO₃system

Anomitra Sil¹, Devendra S. Negi², Mit H. Naik³, Manish Jain³, Ranjan Datta², Rajeev Ranjan⁴ and P. S. Anil Kumar¹^,3^(a)

¹ Centre for Nano Science and Engineering, Indian Institute of Science - Bangalore-560012, India
² International Centre for Materials Science, Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research - Bangalore-560064, India
³ Department of Physics, Indian Institute of Science - Bangalore-560012, India
⁴ Materials Engineering Department, Indian Institute of Science - Bangalore-560012, India

^(a) anil@iisc.ac.in (corresponding author)

Received: 24 November 2018
Accepted: 28 May 2019

Abstract

We report a comparative study of the crystal structure and magnetic properties between (001) oriented epitaxial $\text{BiFeO}_{3}$ films grown on $\text{NdGaO}_{3}$ and $\text{SrTiO}_{3}$ substrates without any magnetic parasitic phase. The 15 nm $\text{BiFeO}_{3}$ film deposited on a $\text{NdGaO}_{3}$ substrate shows substantially high magnetization $({\sim}250\ \text{emu/cc})$ as compared to an identically thick $\text{BiFeO}_{3}$ film $({\sim}100\ \text{emu/cc})$ deposited on a $\text{SrTiO}_{3}$ substrate. Detailed structural analysis revealed that the high magnetization is associated with a monoclinic (Cm) like distortion of the $\text{BiFeO}_{3}$ crystal structure. We corroborated our experimental findings with first principles density functional theory calculations which suggested a saturation magnetization (266 emu/cc) close to the experimentally obtained one and a ferromagnetic ground state with the high spin moment in the Cm phase.

PACS: 75.85.+t – Magnetoelectric effects, multiferroics

© EPLA, 2019

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