Size effects on thin film ferroelectrics: Experiments on isolated single crystal sheets

作者：Chang L W; McMillen M; Morrison F D; Scott J F; Gregg J M^*

来源：Applied Physics Letters, 2008, 93(13): 132904.

DOI：10.1063/1.2990760

Thin lamellae were cut from bulk single crystal BaTiO(3) using a focused ion beam microscope. They were then removed and transferred onto single crystal MgO substrates, so that their functional properties could be measured independent of the original host bulk ferroelectric. The temperature dependence of the capacitance of these isolated single crystal films was found to be strongly bulklike, demonstrating a sharp Curie anomaly, as well as Curie-Weiss behavior. In addition, the sudden change in the remanent polarization as a function of temperature at T(C) was characteristic of a first order phase change. The work represents a dramatic improvement on that previously published by Saad et al. [J. Phys.: Condens. Matter 16, L451 (2004)], as critical shortcomings in the original specimen geometry, involving potential signal contributions from bulk BaTiO3, have now been obviated. That the functional properties of single crystal thin film lamellae are comparable to bulk, and not like those of conventionally deposited heterogeneous thin film systems, has therefore been confirmed.

• 出版日期2008-9-29