Effect of local surface potential distribution on its relaxation in polycrystalline ferroelectric films

Kim, Yunseok; Park, Moonkyu; Bühlmann, Simon; Hong, Seungbum; Kim, Yong Kwan; Ko, Hyun-Seok; Kim, Jiyoon; No, Kwangsoo

doi:10.1063/1.3290953

Cited by 27 publications

(29 citation statements)

References 17 publications

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“…[10][11][12][13][14][15][16][17][18][19] Compared to other SPM modes, the Kelvin probe SPM is more sensitive to electrostatic forces, which can be used to detect the ferroelectric surface potential distribution. 20,21 The SPM of domain and surface potential characterizations in ferroelectrics has been reported. [10][11][12][13] These studies dealt with adsorbates on perovskite surfaces, with some even reporting surface potential inversion.…”

Section: Introductionmentioning

confidence: 99%

Humidity effect on BaTiO3 c-domain surface potential inversion induced by electric field

Volinsky

2011

Journal of Applied Physics

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The potential distribution of ferroelectric domains on a (001) BaTiO3 single crystal surface was investigated via scanning Kelvin probe microscopy at room temperature, with and without an electric field applied parallel to the (001) surface. A reversal of the c domain charge was observed after reaching a critical electric field intensity of 6 V/mm, which was much lower than the 200 V/mm coercive field. An immediate recovery was observed upon switching off the electric field. The humidity has a significant effect on the intensity of the inversion electric field. Surface adsorbates significantly affected the ferroelectric surface potential behavior. Due to a low 4 kJ/mol desorption energy, the electric field successfully removed surface adsorbates, allowing for the surface potential to reflect the actual domain polarization state.

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Section: Introductionmentioning

confidence: 99%

Humidity effect on BaTiO3 c-domain surface potential inversion induced by electric field

Volinsky

2011

Journal of Applied Physics

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“…The asymmetry of the surface potential behaviors can stem from the presence of an internal built-in electric field near the multiferroic/electrode interface, different screen charge of as-grown rate, and different amounts of trap sites. 13,14 Meanwhile, with increasing positive voltage, more holes are injected, and we get saturated screen charges at about 8 V. Further increasing the positively biased voltage to þ10 V, the amplitude of surface potentials decreases gradually due to the overscreen charges. 4 For the negative biased regions, negative surface potentials are obtained due to electrons trapping effect.…”

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confidence: 96%

Orientation-dependent surface potential behavior in Nb-doped BiFeO3

Yan

Xing

Islam

et al. 2012

Applied Physics Letters

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Single-phase epitaxial Nb doped BiFeO3 (BFNO) films have been grown on diverse oriented-SrTiO3 substrates by pulsed laser deposition. The orientation dependent surface potential distributions arising from combination of the screen and polarization charges on the BFNO surfaces were characterized by Kelvin probe force microscopy combining with corresponding domain structures investigation using piezoresponse force microscopy. The relationship between surface potential and potential barrier was quantitatively analyzed through tuning the substrate orientation. The present study indicates that data stability and storage density can be controlled via engineering the substrate orientations.

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“…The first is to vary the polarization by changing the temperature and making use of the pyroelectric properties [8,9]. The second is to inject charges onto the ferroelectric surfaces by applying a bias via a conductive atomic force microscopy (AFM) probe [10,11]. Consequently, EFM or KPFM was then used to monitor the local charge adsorption on the ferroelectric surface.…”

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confidence: 99%

Mechanical Removal and Rescreening of Local Screening Charges at Ferroelectric Surfaces

et al. 2015

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We report the kinetics of screening charge removal and rescreening on periodically poled lithium niobate using charge gradient microscopy (CGM) and electrostatic force microscopy (EFM). A minimum pressure needs to be applied to initiate mechanical screening charge removal, and increasing the pressure leads to further removal of charge until a threshold is reached when all screening charges are removed. We fit all rescreening EFM contrast curves under various pressures into a universal exponential decay. The findings imply that we can control the screening degree of ferroelectric surfaces by mechanical means without affecting the polarization underneath. KEYWORDS: electrostatic force microscopy, piezoresponse force microscopy, charge gradient microscopy, ferroelectric surface, kinetics of adsorption * Corresponding authors: hong@anl.gov (S. H.) and aroelofs@anl.gov (A. R.)

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Effect of local surface potential distribution on its relaxation in polycrystalline ferroelectric films

Cited by 27 publications

References 17 publications

Humidity effect on BaTiO3 c-domain surface potential inversion induced by electric field

Humidity effect on BaTiO3 c-domain surface potential inversion induced by electric field

Orientation-dependent surface potential behavior in Nb-doped BiFeO3

Mechanical Removal and Rescreening of Local Screening Charges at Ferroelectric Surfaces

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