Ferromagnetic–Antiferromagnetic Coupling by Distortion of Fe/Mn Oxygen Octahedrons in (BiFeO3)m(La0.7Sr0.3MnO3)n Superlattices

Interface enhanced magnetism attracts much attention due to its potential use in exploring novel structure devices. Nevertheless, the magnetic behavior at interfaces has not been quantitatively determined. In this study, abnormal magnetic moment reduction is observed in La0.7Sr0.3MnO3 (LSMO)/BiFeO3...

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Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2017-05, Vol.13 (18), p.n/a
Main Authors: Xiong, Jie, Lei, Tianyu, Chu, Junwei, Yang, Chao, Wei, Jiake, Zhuo, Mujin, Choi, Eun‐Mi, Tao, Bowan, Zhang, Wanli, Wang, Yongqiang, Li, Yanrong
Format: Article
Language:English
Subjects:
Antiferromagnetism
Bismuth ferrite
Computer simulation
Coupling
Energy of formation
ferromagnetic–antiferromagnetic coupling
Ferromagnetism
Free energy
Heat of formation
heterointerfaces
Heterostructures
Interfaces
Magnetic domains
Magnetic moments
Magnetic properties
Magnetism
Manganese
Nanotechnology
Octahedrons
Reduction
Strontium titanates
Substrates
Superlattices
Thin films
Unit cell
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Summary:Interface enhanced magnetism attracts much attention due to its potential use in exploring novel structure devices. Nevertheless, the magnetic behavior at interfaces has not been quantitatively determined. In this study, abnormal magnetic moment reduction is observed in La0.7Sr0.3MnO3 (LSMO)/BiFeO3 (BFO) superlattices, which is induced by ferromagnetic (FM)/antiferromagnetic (AFM) coupling in the interface. With reduced repetition of the superlattice's unit cell [(LSMO)n/(BFO)n]60/n (n = 1, 2, 5, 10) on a SrTiO3 substrate, magnetic moment reduction from 25.5 emu cc−1 ([(LSMO)10/(BFO)10]6) to 1.5 emu cc−1 ([(LSMO)1/(BFO)1]60) is obtained. Ab initio simulations show that due to the different magnetic domain formation energies, the magnetic moment orientation tends to be paramagnetic in the FM/AFM interface. The work focuses on the magnetic domain formation energy and provides a pathway to construct artificial heterostructures that can be an effective way to tune the magnetic moment orientation and control the magnetization of ultrathin films. The ferromagnetic (FM)/antiferromagnetic (AFM) coupling between La0.7Sr0.3MnO3 (LSMO) and BiFeO3 (BFO) in [(LSMO)n/(BFO)n]60/n (n = 1, 2, 5, 10) superlattices on SrTiO3 substrate is investigated. The work indicates that the FM/AFM coupling in the BFO/LSMO interface is an obstacle for enhancing the magnetic properties of BFO.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.201700107