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arXiv 1603.07643cond-mat.mtrl-sci
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单相Pb(Zr0 .20Ti0.80)0.70Pd0.30O 3-δ多铁材料的巨磁电耦合

Giant Magnetoelectric coupling in Single Phase Pb(Zr0.20Ti0.80)0.70Pd0.30O3-δ Multiferroics

Shalini Kumari, Dhiren K. Pradhan, Nora Ortega, Kallol Pradhan, Christopher DeVreugd, Gopalan Srinivasan, Ashok Kumar, J. F. Scott, Ram S. Katiyar

摘要:

在过去的十五年中,多铁性(MF)研究团体一直在寻找具有大磁电(ME)耦合的替代室温MF材料,以用于高密度电子元件、低散热存储器和逻辑器件的可能应用。我们研究了Pb(Zr_(0.20)Ti_(0.80))_(0.70)Pd_(0.30)O_(3-δ)(PZTP_(30))体系,该体系在PZT的B位上具有异常大的钯占有率(30%)。这种材料表现出巨大的ME耦合系数~0.36 mV/cm. Oe。有趣的是,这是第一次任何室温单相化合物,显示ME趋势,和类似的幅度在完善的机械应变介导的铁电和铁磁复合材料;后者已经在商业阶段作为nT/pT磁场传感器由于其大ME值。XPS和XRF研究证实了PZTP 30中Pd的存在,并归属为Pd+2和Pd+4离子的结合能分别为336.37 eV和342.9 eV,以及337.53 eV和343.43 eV,这可能是Pd取代PZT陶瓷室温磁性的来源。在~569 K(+/-5 K)下观察到一个尖锐的一级铁电相变,这一点从介电、拉曼和热分析中得到了证实。在室温以上发现了具有大ME耦合的铁磁和铁电有序,这是具有增强功能的单相ME材料发展的重要一步。

英文摘要:

During the last fifteen years, multiferroic (MF) research communities have been searching for an alternative room temperature MF material with large magnetoelectric (ME) coupling for possible applications in high density electronic components, low heat dissipation memory and logic devices. We have studied Pb(Zr0.20Ti0.80)0.70Pd0.30O3-δ (PZTP30) system with an unusually large (30%) palladium occupancy in B site of PZT. This material exhibited a giant ME coupling coefficient ~0.36 mV/cm.Oe. Interestingly, this is the first time any room temperature single phase compound that showed ME trends, and magnitude similar to those in the well established mechanical strain-mediated ferroelectric and ferromagnetic composites; the latter ones are already in the commercial stage as nT/pT magnetic field sensors due to their large ME values. The presence of Pd in PZTP30 has been confirmed by XPS and XRF studies and assigned with related binding energies of Pd+2 and Pd+4 ions as 336.37 eV, 342.9 eV, and 337.53 eV, 343.43 eV, respectively, which may be the origin of room temperature magnetism in Pd substituted PZT ceramics. A sharp first order ferroelectric phase transition was observed at ~569 K (+/-5 K) that is confirmed from dielectric, Raman, and thermal analysis. Both ferromagnetic and ferroelectric orderings with large ME coupling were found above room temperature, a significant step forward in the development of single phase ME material with enhanced functionalities.

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