Magnetic interactions in BiFe₀.₅Mn₀.₅O₃ films and BiFeO₃/BiMnO₃ superlattices

Scientific Reports
Qingyu XuJun Du

Abstract

The clear understanding of exchange interactions between magnetic ions in substituted BiFeO3 is the prerequisite for the comprehensive studies on magnetic properties. BiFe0.5Mn0.5O3 films and BiFeO3/BiMnO3 superlattices have been fabricated by pulsed laser deposition on (001) SrTiO3 substrates. Using piezoresponse force microscopy (PFM), the ferroelectricity at room temperature has been inferred from the observation of PFM hysteresis loops and electrical writing of ferroelectric domains for both samples. Spin glass behavior has been observed in both samples by temperature dependent magnetization curves and decay of thermo-remnant magnetization with time. The magnetic ordering has been studied by X-ray magnetic circular dichroism measurements, and Fe-O-Mn interaction has been confirmed to be antiferromagnetic (AF). The observed spin glass in BiFe0.5Mn0.5O3 films has been attributed to cluster spin glass due to Mn-rich ferromagnetic (FM) clusters in AF matrix, while spin glass in BiFeO3/BiMnO3 superlattices is due to competition between AF Fe-O-Fe, AF Fe-O-Mn and FM Mn-O-Mn interactions in the well ordered square lattice with two Fe ions in BiFeO3 layer and two Mn ions in BiMnO3 layer at interfaces.

References

Feb 1, 2008·Physical Review Letters·H BéaA Barthélémy
Jun 13, 2008·Nano Letters·Lane W MartinR Ramesh
Sep 10, 2013·Physical Review Letters·M SalluzzoG Ghiringhelli

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Citations

Aug 9, 2016·Physical Chemistry Chemical Physics : PCCP·Sanjay Kumar UpadhyayE V Sampathkumaran
Jul 19, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Shu-Chih HawJin-Ming Chen

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Methods Mentioned

BETA
X-ray
circular dichroism
atomic scattering
PFM
scanning electron microscopy
scanning probe microscopy

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