Engineering room-temperature multiferroicity in Bi and Fe codoped BaTiO 3
| Autor: | Kiran Singh, Dinesh Topwal, Supriyo Majumder, Satish Yadav, Krishna Rudrapal, Ayan Roy Chaudhuri, Ram Janay Choudhary, Tapas Paramanik, Debraj Choudhury, Sudipta Mahana, Pratap Pal |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Condensed Matter - Materials Science Materials science Strongly Correlated Electrons (cond-mat.str-el) Physics and Astronomy (miscellaneous) Condensed matter physics Doping Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences 02 engineering and technology Dielectric Coercivity 021001 nanoscience & nanotechnology 01 natural sciences Ferroelectricity Condensed Matter - Strongly Correlated Electrons Tetragonal crystal system Ferromagnetism 0103 physical sciences Dissipation factor ddc:530 Multiferroics 0210 nano-technology |
| Zdroj: | Applied physics letters 117(1), 012901 (2020). doi:10.1063/5.0004785 |
| ISSN: | 1077-3118 0003-6951 |
| Popis: | Applied physics letters 117(1), 012901 (2020). doi:10.1063/5.0004785 Fe doping into BaTiO$_3$ stabilizes the paraelectric hexagonal phase in place of the ferroelectric tetragonal one. We show that simultaneous doping of Bi along with Fe into BaTiO$_3$ effectively enhances the magnetoelectric (ME) multiferroic response (both ferromagnetism and ferroelectricity) at room temperature, through careful tuning of Fe valency along with the controlled recovery of the ferroelectric-tetragonal phase. We also report a systematic increase in large dielectric constant values as well as reduction in loss tangent values with relatively moderate temperature variation of the dielectric constant around room temperature with increasing Bi doping content in Ba$_{1���x}$BixTi$_{0.90}$Fe$_{0.10}$O$_3$ (0 ��� x ��� 0.10), which makes the higher Bi���Fe codoped sample (x = 0.08) promising for use as a room-temperature high-�� dielectric material. Interestingly, the x = 0.08 (Bi���Fe codoped) sample is not only found to be ferroelectrically (���20 times) and ferromagnetically (���6 times) stronger than x = 0 (only Fe-doped) at room temperature, but also observed to be better insulating (larger bandgap) with indirect signatures of larger ME coupling as indicated from anomalous reduction of the magnetic coercive field with decreasing temperature. Thus, room-temperature ME multiferroicity has been engineered in Bi and Fe codoped BTO (BaTiO$_3$) compounds. Published by American Inst. of Physics, Melville, NY |
| Databáze: | OpenAIRE |
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