Here, we report the effect of A-site substitution of Tb at the expense of Bi on the ferroelectric and magnetic properties in m = 5 layered 2-D Aurivillius Bi6Ti3Fe2O18 thin films. The nominal stoichiometry of the prepared compound is Tb0.40Bi5.6Fe2Ti3O18, Tb0.90Bi5.1Fe2Ti3O18, and Bi6Ti3Fe2O18. Phase examination reveals that only 0.40 mol. % is successfully substituted forming Tb0.40Bi5.6Fe2Ti3O18 thin films. Lateral and vertical piezoresponse switching loops up to 200 °C reveal responses for Bi6Ti3Fe2O18, Tb substituted Tb0.40Bi5.6Fe2Ti3O18, and Tb0.90Bi5.1Fe2Ti3O18 thin films along the in-plane (±42.31 pm/V, 88 pm/V and ±134 pm/V, respectively) compared with the out-of-plane (±6.15 pm/V, 19.83 pm/V and ±37.52 pm/V, respectively). The macroscopic in-plane polarization loops reveal in-plane saturation (Ps) and remanence polarization (Pr) for Bi6Ti3Fe2O18 of ±26.16 μC/cm2 and ±22 μC/cm2, whereas, ±32.75 μC/cm2 and ±22.11 μC/cm2, ±40.30 μC/cm2 and ±28.5 μC/cm2 for Tb0.40Bi5.6Fe2Ti3O18 and Tb0.90Bi5.1Fe2Ti3O18 thin films, respectively. No ferromagnetic signatures were observed for Bi6Ti3Fe2O18 and Tb0.40Bi5.6Fe2Ti3O18. However, a weak response was observed for the Tb0.90Bi5.1Fe2Ti3O18 at 2 K. Microstructural analysis of Tb0.90Bi5.1Fe2Ti3O18 revealed that it contains 4 vol. % Fe:Tb rich areas forming FexTbyOz, which accounts for the observed magnetic moment. This study demonstrates the importance of thorough microstructural analysis when determining whether magnetic signatures can be reliably assigned to the single-phase system. We conclude that Tb0.40Bi5.6Fe2Ti3O18 and Tb0.90Bi5.1Fe2Ti3O18 samples are not multiferroic but demonstrate the potential for Fe-RAM applications.
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Exploring ferroelectric and magnetic properties of Tb-substituted m = 5 layered Aurivillius phase thin films
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28 March 2018
Research Article|
March 22 2018
Exploring ferroelectric and magnetic properties of Tb-substituted m = 5 layered Aurivillius phase thin films
Ahmad Faraz
;
Ahmad Faraz
a)
1
Tyndall National Institute, University College Cork
, ‘Lee Maltings’, Dyke Parade, Cork, Ireland
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Jesus Ricote
;
Jesus Ricote
2
Inst. Ciencia de Materiales de Madrid, CSIC
, Cantoblanco, 28049 Madrid, Spain
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Ricardo Jimenez;
Ricardo Jimenez
2
Inst. Ciencia de Materiales de Madrid, CSIC
, Cantoblanco, 28049 Madrid, Spain
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Tuhin Maity
;
Tuhin Maity
1
Tyndall National Institute, University College Cork
, ‘Lee Maltings’, Dyke Parade, Cork, Ireland
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Michael Schmidt
;
Michael Schmidt
1
Tyndall National Institute, University College Cork
, ‘Lee Maltings’, Dyke Parade, Cork, Ireland
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Nitin Deepak;
Nitin Deepak
3
Centre for Materials and Structures, University of Liverpool
, Liverpool, United Kingdom
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Saibal Roy;
Saibal Roy
1
Tyndall National Institute, University College Cork
, ‘Lee Maltings’, Dyke Parade, Cork, Ireland
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Martyn E. Pemble;
Martyn E. Pemble
1
Tyndall National Institute, University College Cork
, ‘Lee Maltings’, Dyke Parade, Cork, Ireland
4
Department of Chemistry, University College Cork
, Cork, Ireland
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Lynette Keeney
Lynette Keeney
1
Tyndall National Institute, University College Cork
, ‘Lee Maltings’, Dyke Parade, Cork, Ireland
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J. Appl. Phys. 123, 124101 (2018)
Article history
Received:
October 21 2017
Accepted:
February 27 2018
Citation
Ahmad Faraz, Jesus Ricote, Ricardo Jimenez, Tuhin Maity, Michael Schmidt, Nitin Deepak, Saibal Roy, Martyn E. Pemble, Lynette Keeney; Exploring ferroelectric and magnetic properties of Tb-substituted m = 5 layered Aurivillius phase thin films. J. Appl. Phys. 28 March 2018; 123 (12): 124101. https://doi.org/10.1063/1.5009986
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