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Displaying 1 - 24 of 24

Self-Assembled Multiferroic Nanostructures in CoFe 2 O 4- PbTiO 3 System

October 12, 2021
Author(s)
Jiying Li, Igor Levin, Julia Slutsker, Virgil Provenzano, Peter K. Schenck, J.H. Yang, Alexander L. Roytburd
The effect of substrate orientation of the morphologies of epitaxial self-assembled nanostructures was demonstrated using newly synthesized multiferroic 0.67PbTiO3-0.33CoFe2O4 nanocomposite thin films. The two-phase nanostructures were grown on single

Theory of Layer SMA Actuators

October 12, 2021
Author(s)
Alexander L. Roytburd, Julia Slutsker
Two types of multilayer actuators based on a shape memory alloy (SMA) film as an adtive component are explored theoretically. One of them uses the bending of an actuator due to the movement of an austenite/martensite interface of a SMA film parallel to a

Deformation of Heterogeneous Adaptive Composite

October 16, 2008
Author(s)
Julia Slutsker, Alexander L. Roytburd
The superelastic deformation of an adaptive layer composite containing a shape memory alloy as an active component is considered in this paper. It is shown that the intrisic instability of superelastic deformation can be suppressed in such kind of the

Morphological Transitions of Elastic Domain Structures in Constrained Layers

October 16, 2008
Author(s)
Julia Slutsker, Andrei Artemev, Alexander L. Roytburd
The phase transformation in a constrained layer is a subject of this paper. The formation and evolution of polydomain microstructure under external stress in the constrained layer are investigated by phase-field simulation and analytically using

Design of Self-Assembled Multiferroic Nanostructures in Epitaxial Films

January 23, 2006
Author(s)
Igor Levin, Jiying Li, Julia Slutsker, Alexander L. Roytburd
An approach for a rational design of self-assembled multiferroic nanostructures with controlled phase morphologies was demonstrated using the 3-D epitaxial CoFe2O4-PbTiO3 films grown on single-crystal SrTiO3 substrates. The transverse nanostructures

Phase Field Modeling of Solidification Under Stress

July 1, 2004
Author(s)
Julia Slutsker, Alexander L. Roytburd, James A. Warren, Geoffrey B. McFadden, William J. Boettinger
A phase-field model that includes stress field during non-isothermal solidification of a one-component system has been developed. The model has been applied to solidification and melting of confined spherical volumes. It has been shown that at some

Martensitic Transformations in Constrained Films

June 1, 2002
Author(s)
Alexander L. Roytburd, Julia Slutsker
Polydomain micro- and nano-structures are natural products of phase transformations in solids. The trend to minimize the energy of internal long-range fields (magnetic, electric or mechanical) leads to the formation of the arrangment of domain of different

Coherent Phase Equilibria in a Bending Film

April 1, 2002
Author(s)
Alexander L. Roytburd, Julia Slutsker
The theory of coherent phase diagrams is expanded to phase transformations in films. Coherent phase transformations in a free standing film or a thin plate are considered. It is suggested that the misfit between the phases dictates their layer arrangement

Control of Intrinsic Instability of Superelastic Deformation

January 1, 2002
Author(s)
Julia Slutsker, Alexander L. Roytburd
The superelastic deformation of shape memory alloys has intrinsic instability as a result of incompatibility between martensite and austenite phases at stress-induced transformation. The instability leads to the stress-strain hysteresis of the superelastic

Modeling of Superelastic Adaptive Composites

November 1, 2001
Author(s)
Julia Slutsker, Alexander L. Roytburd
An adaptive composite containing a shape memory alloy as an active component is the subject of this research. These composites utilize the unique properties of SMA, which change their crystalline structure in response to the change temperature and stress

Three-Domain Architecture of Stress-Free Epitaxial Ferroelectric Films

January 1, 2001
Author(s)
Alexander L. Roytburd, S P. Alpay, V Nagarajan, Leonid A. Bendersky, R Ramesh
Epitaxial ferroelectric films undergoing a cubic-tetragonal phase transformation relax internal stresses due to the structural phase transformation and the difference in the thermal expansion coefficients of the film and the substrate by forming polydomain

Vortex Pinning in Microindented Yba 2 Cu 3 O 7-x Single Crystals

August 1, 2000
Author(s)
Marina Turchinskaya, Douglas T. Smith, Alexander L. Roytburd, Debra L. Kaiser
A high resolution magneto-optical technique with a magnetic indicator film was used to study the effect of a regular array of micrometer-sized mechanical indentations on magnetization dynamics at the surface of a twinned single crystal of Yba 2Cu 3O 7-δ as