The Experts below are selected from a list of 2169 Experts worldwide ranked by ideXlab platform
Colm Durkan - One of the best experts on this subject based on the ideXlab platform.
-
unexpected Controllable Pair structure in ferroelectric nanodomains
Nano Letters, 2011Co-Authors: Yachin Ivry, Daping Chu, J F Scott, Ekhard K H Salje, Colm DurkanAbstract:The imminent inability of silicon-based memory devices to satisfy Moore's Law is approaching rapidly. Controllable nanodomains of ferroic systems are anticipated to enable future high-density nonvolatile memory and novel electronic devices. We find via piezoresponse force microscopy (PFM) studies on lead zirconate titanate (PZT) films an unexpected nanostructuring of ferroelectric-ferroelastic domains. These consist of c-nanodomains within a-nanodomains in proximity to a-nanodomains within c-domains. These structures are created and annihilated as Pairs, controllably. We treat these as a new kind of vertex-antivertex Pair and consider them in terms of the Srolovitz-Scott 4-state Potts model, which results in Pairwise domain vertex instabilities that resemble the vortex-antivortex mechanism in ferromagnetism, as well as dislocation Pairs (or disclination Pairs) that are well-known in nematic liquid crystals. Finally, we show that these nanoPairs can be scaled up to form arrays that are engineered at will, paving the way toward facilitating them to real technologies.
Yachin Ivry - One of the best experts on this subject based on the ideXlab platform.
-
unexpected Controllable Pair structure in ferroelectric nanodomains
Nano Letters, 2011Co-Authors: Yachin Ivry, Daping Chu, J F Scott, Ekhard K H Salje, Colm DurkanAbstract:The imminent inability of silicon-based memory devices to satisfy Moore's Law is approaching rapidly. Controllable nanodomains of ferroic systems are anticipated to enable future high-density nonvolatile memory and novel electronic devices. We find via piezoresponse force microscopy (PFM) studies on lead zirconate titanate (PZT) films an unexpected nanostructuring of ferroelectric-ferroelastic domains. These consist of c-nanodomains within a-nanodomains in proximity to a-nanodomains within c-domains. These structures are created and annihilated as Pairs, controllably. We treat these as a new kind of vertex-antivertex Pair and consider them in terms of the Srolovitz-Scott 4-state Potts model, which results in Pairwise domain vertex instabilities that resemble the vortex-antivortex mechanism in ferromagnetism, as well as dislocation Pairs (or disclination Pairs) that are well-known in nematic liquid crystals. Finally, we show that these nanoPairs can be scaled up to form arrays that are engineered at will, paving the way toward facilitating them to real technologies.
Inmaculada De Hoyos - One of the best experts on this subject based on the ideXlab platform.
-
canonical form associated with the problem of perturbation of one column of a Controllable Pair
Linear Algebra and its Applications, 2013Co-Authors: Itziar Baragana, Asuncion M Beitia, Inmaculada De HoyosAbstract:Abstract Let ( A , B ) be a completely Controllable matrix Pair. When we consider the problem of characterizing the controllability indices of all the matrix Pairs obtained by small perturbations on one column of B , a new equivalence relation arises in a natural way. This equivalence relation is a kind of partial feedback equivalence. As a consequence the controllability indices are invariant, but they do not form a complete system of invariants. We have found new invariants for this equivalence relation and we have obtained a canonical form in terms of these invariants.
-
the change of the brunovsky structure of a Controllable Pair under one column perturbation in a particular case
Linear Algebra and its Applications, 2012Co-Authors: Itziar Baragana, Asuncion M Beitia, Inmaculada De HoyosAbstract:Abstract We study the variation of the controllability indices of a Pair ( A , B ) = ( A , [ B 1 b ] ) ∈ C n × n × C n × ( m 1 + 1 ) , where ( A , B 1 ) is Controllable, when we make small additive perturbations on the last column of B , in a particular case.
Ion Zaballa - One of the best experts on this subject based on the ideXlab platform.
-
on the parametrization of the controllability subspaces of a Controllable Pair
Linear Algebra and its Applications, 2005Co-Authors: F Puerta, Xavier Puerta, Ion ZaballaAbstract:Given a Controllable linear control system defined by a Pair of constant matrices (A;B), the set of controllability subspaces is an stratified submanifold of the set of (A;B)-invariant subspaces. We parameterize each strata by means of coordinate charts. This parametrization has significant dierences to that of ( A;B) invariant subspaces, showing a more complex geometric structure.
Daping Chu - One of the best experts on this subject based on the ideXlab platform.
-
unexpected Controllable Pair structure in ferroelectric nanodomains
Nano Letters, 2011Co-Authors: Yachin Ivry, Daping Chu, J F Scott, Ekhard K H Salje, Colm DurkanAbstract:The imminent inability of silicon-based memory devices to satisfy Moore's Law is approaching rapidly. Controllable nanodomains of ferroic systems are anticipated to enable future high-density nonvolatile memory and novel electronic devices. We find via piezoresponse force microscopy (PFM) studies on lead zirconate titanate (PZT) films an unexpected nanostructuring of ferroelectric-ferroelastic domains. These consist of c-nanodomains within a-nanodomains in proximity to a-nanodomains within c-domains. These structures are created and annihilated as Pairs, controllably. We treat these as a new kind of vertex-antivertex Pair and consider them in terms of the Srolovitz-Scott 4-state Potts model, which results in Pairwise domain vertex instabilities that resemble the vortex-antivortex mechanism in ferromagnetism, as well as dislocation Pairs (or disclination Pairs) that are well-known in nematic liquid crystals. Finally, we show that these nanoPairs can be scaled up to form arrays that are engineered at will, paving the way toward facilitating them to real technologies.