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Magnetic and ferroelectric properties of Aurivillius phase Bi 7 Fe 3 Ti 3 O 21 and their doped films
Ceramics International ( IF 5.2 ) Pub Date : 2017-12-01 , DOI: 10.1016/j.ceramint.2017.09.136
D.P. Song , J. Yang , Y.X. Wang , J. Yang , X.B. Zhu

Abstract Thin films of Bi7Fe3Ti3O21, Bi7Fe2CoTi3O21, and Bi6.15Sm0.85Fe2CoTi3O21 are prepared on Pt/Ti/SiO2/Si (100) substrates by using a chemical solution deposition route and the magnetic and ferroelectric properties are investigated. Thin film of Bi7Fe3Ti3O21 shows robust ferroelectric polarization loop compared with ceramics, signal crystal and thin films reported before. The room-temperature ferromagnetism is clearly observed in the films of Bi7Fe2CoTi3O21 and Bi6.15Sm0.85Fe2CoTi3O21, while the Bi7Fe3Ti3O21 film shows the paramagnetic behavior at room temperature. The Co-doped sample exhibits a high remnant magnetization Mr of 2.67 emu/cm3 and remnant polarization Pr of 19.2 μC/cm2. The ferromagnetism can be ascribed to the spin canting of Fe- and Co-based sublattices via the Dzyaloshinskii-Moriya interaction and the ferrimagnetic ordering of transition metals. The improvement of the Pr and Mr are discussed in terms of growth grain size, reduce grain boundary, and the variation of intergrain connectivity caused by Co- and Sm-doping.

中文翻译:

Aurivilius相Bi 7 Fe 3 Ti 3 O 21 及其掺杂薄膜的磁性和铁电性能

摘要 采用化学溶液沉积法在 Pt/Ti/SiO2/Si (100) 衬底上制备了 Bi7Fe3Ti3O21、Bi7Fe2CoTi3O21 和 Bi6.15Sm0.85Fe2CoTi3O21 薄膜,并研究了磁性和铁电性能。与之前报道的陶瓷、信号晶体和薄膜相比,Bi7Fe3Ti3O21 薄膜显示出强大的铁电极化回路。在 Bi7Fe2CoTi3O21 和 Bi6.15Sm0.85Fe2CoTi3O21 薄膜中可以清楚地观察到室温铁磁性,而 Bi7Fe3Ti3O21 薄膜在室温下表现出顺磁行为。Co 掺杂样品表现出 2.67 emu/cm3 的高残余磁化强度 Mr 和 19.2 μC/cm2 的残余极化 Pr。铁磁性可以归因于铁基和钴基亚晶格通过 Dzyaloshinskii-Moriya 相互作用和过渡金属的亚铁磁排序的自旋倾斜。从生长晶粒尺寸、减小晶界以及由 Co 和 Sm 掺杂引起的晶间连通性的变化方面讨论了 Pr 和 Mr 的改善。
更新日期:2017-12-01
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