Abstract：
:The unique properties of ferroelectric materials enable a plethora of applications, which are hindered by the phenomenon known as ferroelectric fatigue that leads to the degradation of ferroelectric properties with polarization cycling. Multiple microscopic models explaining fatigue have been suggested; however, the chemical origins remain poorly understood. Here, we utilize multimodal chemical imaging that combines atomic force microscopy with time-of-flight secondary mass spectrometry to explore the chemical phenomena associated with fatigue in PbZr0.2Ti0.8O3 (PZT) thin films. Investigations reveal that the degradation of ferroelectric properties is correlated with a local chemical change and migration of electrode ions into the PZT structure. Density functional theory simulations support the experimental results and demonstrate stable doping of the thin surface PZT layer with copper ions, leading to a decrease in the spontaneous polarization. Overall, the performed research allows for the observation and understanding of the chemical phenomena associated with polarization cycling and their effects on ferroelectric functionality.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Ievlev AV,Kc S,Vasudevan RK,Kim Y,Lu X,Alexe M,Cooper VR,Kalinin SV,Ovchinnikova OSdoi
10.1038/s41467-019-11089-wsubject
Has Abstractpub_date
2019-07-11 00:00:00pages
3064issue
1issn
2041-1723pii
10.1038/s41467-019-11089-wjournal_volume
10pub_type
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