Settling the “Dead Layer” Debate in Nanoscale Capacitors

Chang, L.-W.; Alexe, Marin; Scott, J. F.; Gregg, J. M.

doi:10.1002/adma.200901756

Cited by 100 publications

(82 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Dead layers have been discussed in the context of ferroelectrics, where they are often proposed as explanations for the worsening of the dielectric constant of thin films, although the exact nature, thickness, and even location of the dead layer, which might be inside the electrode, is still a subject of debate (Sinnamon, Bowman, and Gregg, 2001;Stengel and Spaldin, 2006;Chang et al, 2009). In ferroelectrics, dead layers prevent screening causing domains to appear (Bjorkstam and Oettel, 1967;Kopal et al, 1999;Bratkovsky and Levanyuk, 2000).…”

Section: Domains a Boundary Conditions And The Formation Of Domainsmentioning

confidence: 99%

Domain wall nanoelectronics

et al. 2012

View full text Add to dashboard Cite

Domains in ferroelectrics were considered to be well understood by the middle of the last century: They were generally rectilinear, and their walls were Ising-like. Their simplicity stood in stark contrast to the more complex Bloch walls or Néel walls in magnets. Only within the past decade and with the introduction of atomic-resolution studies via transmission electron microscopy, electron holography, and atomic force microscopy with polarization sensitivity has their real complexity been revealed. Additional phenomena appear in recent studies, especially of magnetoelectric materials, where functional properties inside domain walls are being directly measured. In this paper these studies are reviewed, focusing attention on ferroelectrics and multiferroics but making comparisons where possible with magnetic domains and domain walls. An important part of this review will concern device applications, with the spotlight on a new paradigm of ferroic devices where the domain walls, rather than the domains, are the active element. Here magnetic wall microelectronics is already in full swing, owing largely to the work of Cowburn and of Parkin and their colleagues. These devices exploit the high domain wall mobilities in magnets and their resulting high velocities, which can be supersonic, as shown by Kreines' and co-workers 30 years ago. By comparison, nanoelectronic devices employing ferroelectric domain walls often have slower domain wall speeds, but may exploit their smaller size as well as their different functional properties. These include domain wall conductivity (metallic or even superconducting in bulk insulating or semiconducting oxides) and the fact that domain walls can be ferromagnetic while the surrounding domains are not.

show abstract

Section: Domains a Boundary Conditions And The Formation Of Domainsmentioning

confidence: 99%

Domain wall nanoelectronics

et al. 2012

View full text Add to dashboard Cite

show abstract

“…These ferroelectric platelets fabricated by FIB have greatly improved our understanding of the fundamental properties of thin films. [18,19] However, recent theoretical research predicts that ferroelectric nanodiscs could even favor an ultimate NFERAM density of 60 10 12 bits per square inch as well as a new toroid moment. [20] In contrast to the conventional properties, the surface chemistry of ferroelectric oxides only gradually became an active field of research.…”

mentioning

confidence: 98%

Self‐Templated Synthesis of Single‐Crystal and Single‐Domain Ferroelectric Nanoplates

et al. 2012

View full text Add to dashboard Cite

“…In the field of electrochemistry, how the classical electrocapillary Lippmann equation should be modified to account for the elastic effects on solid electrodes is still a controversial issue [2][3][4][5][6][7][8][9][10][11]. As to dielectrics, various novel surface-induced phenomena have *Corresponding author (email: yusw@mail.tsinghua.edu.cn) been observed, e.g., the emergence of dielectric 'dead layer' in nanocapacitors [12][13][14], the presence of an intrinsic conducting electron layer on the surface of insulating BaTiO 3 [15], and the possibility of polarity inversion in ZnO nanowires as indicated by recent ab initio calculations [16]. Among those intriguing phenomena, the simplest, ubiquitous, and of fundamental importance are the linear surface piezoeffects.…”

Section: Introductionmentioning

confidence: 99%

A continuum theory of surface piezoelectricity for nanodielectrics

Pan

Feng

2011

Sci. China Phys. Mech. Astron.

View full text Add to dashboard Cite

In this paper, a phenomenological continuum theory of surface piezoelectricity accounting for the linear superficial interplay between electricity and elasticity is formulated primarily for elastic dielectric materials. This theory is inspired by the physical idea that once completely relaxed, an insulating free dielectric surface will sustain a nontrivial spontaneous surface polarization in the normal direction together with a tangential self-equilibrated residual surface stress field. Under external loadings, the surface Helmholtz free energy density is identified as the characteristic function of such surfaces, with the in-plane strain tensor of surface and the surface free charge density as the independent state variables. New boundary conditions governing the surface piezoelectricity are derived through the variational method. The resulting concepts of charge-dependent surface stress and deformationdependent surface electric field reflect the linear electromechanical coupling behavior of nanodielectric surfaces. As an illustrative example, an infinite radially polarizable piezoelectric nanotube with both inner and outer surfaces grounded is investigated. The novel phenomenon of possible surface-induced polarity inversion is predicted for thin enough nanotubes.surface effects, piezoelectricity, nanodielectrics, surface stress, spontaneous surface polarization PACS: 62.25.+g, 68.35.Md, 77.22.Ej

show abstract

Settling the “Dead Layer” Debate in Nanoscale Capacitors

Cited by 100 publications

References 32 publications

Domain wall nanoelectronics

Domain wall nanoelectronics

Self‐Templated Synthesis of Single‐Crystal and Single‐Domain Ferroelectric Nanoplates

A continuum theory of surface piezoelectricity for nanodielectrics

Contact Info

Product

Resources

About