Electronic Structure of BiFe1−xMnxO3Thin Films Investigated by X-Ray Absorption Spectroscopy

Abduleziz Ablat,Jiaou Wang,Rong Wu,Nian Zhang,Rui Wu,Kurash Ibrahim,Emin Muhemmed,Cheng Si,Haijie Qian

doi:10.1155/2012/123438

Abduleziz Ablat, Jiaou Wang + Show 7 more

Open Access

https://doi.org/10.1155/2012/123438

Copy DOI

Abstract

Multiferroic polycrystalline BiFe1-xMnxO3(0≤x≤0.3) thin films have been prepared on the Pt(111)/Ti/SiO2/Si(100) substrates by pulsed laser deposition method. The influence of Mn substitution on the electronic structure and magnetic properties has been studied. X-ray diffraction spectroscopy shows that Mn substitution slightly modulates crystal structure of the BiFe1-xMnxO3system within the same structural phase. According to FeLedge X ray absorption spectroscopy, Fe ions are found to be formally trivalent for doping amountxin BiFe1-xMnxO3. The enhanced magnetization by increasing Mn content is attributed to an alternation degree of hybridization between Fe 3d-O 2pand Mn 3d-O 2porbitals, basing on the carefully examined FeLand OKedge X-ray absorption spectroscopy. The crystal structural and the electronic structural results show a causal relation between them by demonstrating intrinsic mutual dependence between respective variations.

Highlights

Multiferroics are a group of materials which simultaneously show up several kinds of ferroic properties such as ferroelectricity, ferromagnetism, and ferroelasticity in the same phase [1]
The BiFe1−xMnxO3 (0 ≤ x ≤ 0.3) films were prepared by pulsed laser deposition (PLD) method on the Pt(111)/Ti/SiO2/Si(100) substrates in a PLD chamber connected to the photoemission spectroscopy (PES) system at 4B9B beam line of the Beijing Synchrotron Radiation Facility
Decrease at the O K edge implies that the localization of Mn 3d5L states is enhanced with the Mn doping. These results indicate a scenario that the Fe 3d-O 2p hybridization strength weakens with the enhanced Mn 3d-O 2p hybridization effect in the BFMO thin films

Summary

Introduction

Multiferroics are a group of materials which simultaneously show up several kinds of ferroic properties such as ferroelectricity, ferromagnetism, and ferroelasticity in the same phase [1]. The BFO is considered to be a room-temperature multiferroics, its ME effect is too low because of weak ferromagnetism. The other is first to achieve phase transition from antiferromagnetic to ferromagnetic and increase magnetic properties while retaining the ferroelectricity through strain modification [6, 7]. Mn doping is the most common method to achieve an enhanced magnetization This is because the BiMnO3—a Mn centered compound of BiMO3 series—exhibits ferromagnetism below ∼105 K and ferroelectric at ∼450 K [8]. The BiMnO3 has a large ferromagnetic magnetization, implying that the Mn doping in BFO improves the magnetization and enhances the ME effects more effectively than other element substitution. Origin for the enhanced magnetization of the BFMO system with increased Mn amount of doping is investigated in terms of their electronic structural changes

Experiment

Findings

Result and Discussion

Conclusion