Giant Strain and Induced Ferroelectricity in Amorphous BaTiO3 Films under Poling

Materials

Ali Baghizadeh¹  Pegah Mirzadeh Vaghefi²  Armando A.C.S. Lourenço²  Vitor S. Amaral²  Andre L. Kholkin² 

[1] Department of Materials and Ceramics Engineering & CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal;Department of Physics & CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal;

关键词: BaTiO3;    ferroelectricity;    piezoresponse force microscopy;    self-assembly;    poling;   

DOI  :  10.3390/ma10091107

来源: DOAJ

【 摘 要 】

We report an effect of giant surface modification of a 5.6 nm thick BaTiO3 film grown on Si (100) substrate under poling by conductive tip of a scanning probe microscope (SPM). The surface can be locally elevated by about 9 nm under −20 V applied during scanning, resulting in the maximum strain of 160%. The threshold voltage for the surface modification is about 12 V. The modified topography is stable enough with time and slowly decays after poling with the rate ~0.02 nm/min. Strong vertical piezoresponse after poling is observed, too. Combined measurements by SPM and piezoresponse force microscopy (PFM) prove that the poled material develops high ferroelectric polarization that cannot be switched back even under an oppositely oriented electric field. The topography modification is hypothesized to be due to a strong Joule heating and concomitant interface reaction between underlying Si and BaTiO3. The top layer is supposed to become ferroelectric as a result of local crystallization of amorphous BaTiO3. This work opens up new possibilities to form nanoscale ferroelectric structures useful for various applications.

【 授权许可】

Unknown