Track topics on Twitter Track topics that are important to you
Recent experiments have demonstrated the existence of vortex or flux-closure domains in ferroelectric nanostructures, which are attractive to develop high-density data storage and novel configurable electronic devices. However, it remains challenging to stabilize in-plane vortex or flux-closure domains in ferroelectric film for the absence of a lateral geometry confinement. Based on a three-dimensional phase field model, here we show that stabilization of isolated or interacting in-plane vortices in ferroelectric film can be achieved via applying a mechanical tip-force. The formation of such dipole vortices is caused by a conjoint effect of the tip-force-induced depolarization effect and in-plane strain. The effects of factors like film thickness, misfit strain, tip force and temperature on the vortex formation are systematically revealed and summarized as phase diagrams. The interaction between tip-induced vortices is also investigated. It is found that as the two tips get closer than the critical distance, the two initially isolated vortices become coupled, with identical or opposite chirality, depending on the distance between the two tips. A maximum data storage density of isolated in-plane vortices in ferroelectric thin film is ~1 Tb/in2. Our work thus demonstrates a mechanical strategy to stabilize dipole vortices, and provides a comprehensive insight into the characteristics of ferroelectric film under a mechanical tip force.
This article was published in the following journal.
Name: Journal of physics. Condensed matter : an Institute of Physics journal
Ferroelectric materials exhibit novel topological polarization configurations due to geometric confinements originating from the material shapes and interfaces at the nanoscale. In this study, we demo...
Topological defects, such as vortices and skyrmions, provide a wealth of splendid possibilities to new nanoscale devices because of their marvelous electronic, magnetic, and mechanical behaviors. Rece...
Ferroelectricity and electrical conductivity are two fundamentally incompatible properties that are difficult to simultaneously achieve in a material. Here, we combine these two contradictory properti...
Ferroelectric heterostructures, with capability of storing data at ultra-high densities, could act as the platform for next-generation memories. The development of new device paradigms has been hamper...
The grip force applied to maintain grasp of a hand-held object has been typically reported as tightly coupled to the load force exerted by the object as it is actively manipulated, occurring proportio...
Writer's cramp is a focal dystonia characterized by abnormal movements and postures during writing. Limited finger independence during writing manifests as difficulty suppressing unwanted ...
SPARTA force plate is used as rehabilitation tool in this study. The device is Force Plate coupled with SPARTA scan software that enables quick assessment of individual movement and balanc...
A randomized, pilot feasibility and preliminary efficacy study to test such an intervention among hospitalized patients with AML who are receiving high-dose chemotherapy. Subjects randomiz...
This study will determine whether the psychological benefits of expressive writing extend to diabetic patients, how long the benefits will last, and whether additional expressive writing "...
UCLA researchers looking for healthy females (age 60+) to participate in a study investigating how writing about your experiences may be related to your health. Once a week for 6 weeks, p...
The writing of history; the principles, theory, and history of historical writing; the product of historical writing. (Webster, 3d ed)
Any method of artificial breathing that employs mechanical or non-mechanical means to force the air into and out of the lungs. Artificial respiration or ventilation is used in individuals who have stopped breathing or have RESPIRATORY INSUFFICIENCY to increase their intake of oxygen (O2) and excretion of carbon dioxide (CO2).
The behaviors of materials under force.
The properties and processes of materials that affect their behavior under force.
Non-invasive imaging methods based on the mechanical response of an object to a vibrational or impulsive force. It is used for determining the viscoelastic properties of tissue, and thereby differentiating soft from hard inclusions in tissue such as microcalcifications, and some cancer lesions. Most techniques use ultrasound to create the images - eliciting the response with an ultrasonic radiation force and/or recording displacements of the tissue by Doppler ultrasonography.