Pulsed laser ablation deposition and characterization of superconductive/ferroelectric bilayers

被引:9
作者
Ceresara, L
Iembo, A
Fuso, F
Labardi, M
Allegrini, M
Arimondo, E
Diodati, A
Watts, BE
Leccabue, F
Bocelli, G
机构
[1] CNR,IST MASPEC,I-43100 PARMA,ITALY
[2] CNR,CTR STUDIO STRUTTURIST DIFFRATTOMETR,I-43100 PARMA,ITALY
[3] UNIV MESSINA,DIPARTIMENTO FIS MAT GEOFIS FIS AMBIENTE,I-98166 SANT AGATA,ITALY
关键词
D O I
10.1088/0953-2048/9/8/009
中图分类号
O59 [应用物理学];
学科分类号
摘要
Superconductive/ferroelectric YBCO/PZT bilayer structures have been deposited by pulsed laser ablation on (100) MgO and SrTiO3 substrates. Before the fabrication of the bilayer, optimization of the YBCO deposition parameters was carried out to improve the electrical, morphological and structural characteristics of the films. The results of x-ray diffraction spectroscopy, resistance versus temperature measurements, atomic force and scanning electron microscopies demonstrate the growth of YBCO films suitable as bottom layers for subsequent PZT deposition. The superconductive/ferroelectric bilayers, as characterized by x-ray diffraction and scanning electron microscopy, demonstrate the presence of the correct lattice structures for both YBCO and PZT layers and a good surface morphology (i.e. the absence of cracks and holes and low droplet density), The ferroelectric capacitors realized by using the YBCO layer and evaporated gold dots as bottom and top electrodes, respectively, exhibit excellent ferroelectric behaviour (remanent polarization P-r approximate to 21 mu C cm(-2), coercive field E(c) approximate to 100 kV cm(-1)), suggesting that laser deposited YBCO/PZT bilayers are promising as candidates for the fabrication of non-volatile random access memory devices.
引用
收藏
页码:671 / 677
页数:7
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