Effect of annealing process on dielectric and multiferroic properties of Sol-Gel derived bismuth chromate thin films

IF 1.3 4区物理与天体物理 Q4 PHYSICS, CONDENSED MATTER

Ferroelectrics Letters Section Pub Date : 2017-05-04 DOI:10.1080/07315171.2017.1319749

R. V. Williama, A. Marikania, D. Madhavanb, George W. Taylor

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引用次数: 3

Abstract

ABSTRACT Multiferroic materials such as BiCrO3, uniquely exhibit ferroelectricity and ferromagnetism simultaneously have been extensively studied for spintronics device applications. Conversely, the origin of multiferroicity remains poorly understood. In this paper, the structural phases of BiCrO3 over Pt (111)/Ti/SiO2/Si substrate and their lattice distortions after careful annealing were carefully investigated to explain their multiferroicity. Structural transition and different phases was studied from X-ray diffraction at different annealing temperature from 400°C to 700°C and the size of the grains were calculated from Scherrer's equation. SEM and AFM reveal nano-rod formation and the size and density of nano-rods tends to increase with increase of temperature. The step height variation and surface outgrowth of the films at different annealing temperature were further studied by measuring root mean square (RMS) and roughness (Rq) values. The frequency dependent dielectric behavior with terrific dielectric constant and dielectric loss were observed using LCRQ meter. Structural transformation also results an improved (well saturated) ferromagnetism at 700°C from weak ferromagnetism at 400°C due to addition of extra phases. This kind of approach could be used to probe the origin of multiferroic properties in rare-earth materials for device applications.

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退火工艺对溶胶-凝胶法制备铬酸铋薄膜介电性能和多铁性的影响

以BiCrO3为代表的多铁性材料同时具有铁电性和铁磁性，在自旋电子学器件应用中得到了广泛的研究。相反，多铁性的起源仍然知之甚少。本文研究了Pt (111)/Ti/SiO2/Si衬底上BiCrO3的结构相及其退火后的晶格畸变，以解释其多铁性。在400 ~ 700℃的不同退火温度下，用x射线衍射研究了晶粒的结构转变和不同相，并用Scherrer方程计算了晶粒尺寸。扫描电镜和原子力显微镜观察到纳米棒的形成，纳米棒的尺寸和密度随温度的升高而增大。通过测量薄膜的均方根(RMS)和粗糙度(Rq)，进一步研究了不同退火温度下的台阶高度变化和表面生长情况。用LCRQ计观察了具有良好介电常数和介电损耗的频率相关介电行为。由于添加了额外的相，结构转变还导致700°C时的铁磁性从400°C时的弱铁磁性得到改善(良好饱和)。这种方法可用于探索器件应用中稀土材料多铁性的起源。

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来源期刊

Ferroelectrics Letters Section 物理-物理：凝聚态物理

CiteScore

1.10

自引率

0.00%

发文量

审稿时长

4.8 months

期刊介绍： Ferroelectrics Letters is a separately published section of the international journal Ferroelectrics. Both sections publish theoretical, experimental and applied papers on ferroelectrics and related materials, including ferroelastics, ferroelectric ferromagnetics, electrooptics, piezoelectrics, pyroelectrics, nonlinear dielectrics, polymers and liquid crystals. Ferroelectrics Letters permits the rapid publication of important, quality, short original papers on the theory, synthesis, properties and applications of ferroelectrics and related materials.