應力調節複雜性氧化物之極化性質

謝孆慧

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應力調節複雜性氧化物之極化性質

Modulation of Electrical Polarization in Complex Oxides via Strain

謝孆慧 , Ph.D　　Advisor：朱英豪　　

英文

複雜性氧化物；應變；極化； Complex Oxide ； Strain ； Polarization

Abstract │ Reference (143) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

In this thesis, we study how the polarization in complex oxides are affected by the strain. It is discussed in two parts: in the first part, the reversal of the ferroelectric polarization of multiferroic BiFeO3 (BFO) is constrained to enhance the ferroelectric retention, and in the second part flexoelectricity is created through a compositional gradient.
Firstly, Non-volatile electronic devices based on magnetoelectric multiferroics have triggered new possibilities of outperforming conventional devices for applications in information storage, the emerging field of spintronics, and sensors. However, ferroelectric reliability issues, such as imprint, retention, and fatigue, must be solved before the realization of practical devices. In this study, everlasting ferroelectric retention in the heteroepitaxial constrained multiferroic mesocrystal is reported, suggesting a new approach to overcome the failure of ferroelectric retention. Studied by scanning probe microscopy and transmission electron microscopy, and supported via phase-ﬁeld simulations, the key to the success of ferroelectric retention is to prevent the crystal from ferroelastic deformation during the relaxation of the spontaneous polarization in a ferroelectric nanocrystal.
On the other hand, complex oxides present versatile properties, such as ferroelectricity, superconducting, and colossal magnetoresistance (CMR), and have been widely studied. To improve or manipulate the properties, complex oxides are designed and well grown into different structures, from the thin film of a single material to hetero-structures combining at least two materials. With the advance of growth techniques, the accuracy of growth is controlled on the scale of a unit cell via the assistance of reflection high-energy electron diffraction (RHEED). Utilizing the ability to control the growth at the atomic scale, a non-uniformity with compositional gradient along the out-of-plane (OOP) direction is created. The model system is constituted by SrTiO3 (STO) and LaAlO3 (LAO). Under this circumstance of an OOP compositional gradient, a strain gradient ensues. Polarity discontinuities between STO and LAO are also expected compared to the bi-layer system. Through the coupling among the charge, orbital, and lattice, a spontaneous polarization is created. Since the spontaneous polarization is induced and manipulated by the strain gradient, the behavior is named “flexoelectricity”.

Reference ( 143 ) 〈TOP〉

1. Ishihara, T., Perovskite Oxide for Solid Oxide Fuel Cells. Springer Science & Business Media: 2009.
2. Nix, W. D., Mechanical properties of thin films. Metallurgical transactions A 1989, 20 (11), 2217-2245.
3. Speck, J.; Daykin, A.; Seifert, A.; Romanov, A.; Pompe, W., Domain configurations due to multiple misfit relaxation mechanisms in epitaxial ferroelectric thin films. III. Interfacial defects and domain misorientations. Journal of applied physics 1995, 78 (3), 1696-1706.
4. Nix, W.; Clemens, B., Crystallite coalescence: A mechanism for intrinsic tensile stresses in thin films. Journal of Materials Research 1999, 14 (08), 3467-3473.
5. Beach, R.; Borchers, J.; Matheny, A.; Erwin, R.; Salamon, M.; Everitt, B.; Pettit, K.; Rhyne, J.; Flynn, C., Enhanced Curie temperatures and magnetoelastic domains in Dy/Lu superlattices and films. Physical review letters 1993, 70 (22), 3502.

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