University of California

Northrop Grumman Systems Corporation

Other

The United States of America As Represented by the Administrator of the

United States of America As Represented by the Administrator of Nasa

Lawrence Livermore National Security, LLC

Gregory Paul Carman

Scott Macklin Keller

Fernando Vinuela

Youngjae Chun

William Lance Richards

Daniel S Levi

Paul Killian Nordeen

Joshua Hockel

Ken Kinwah Ho

Sarah H Tolbert

Pedram Khalili Amiri

Yuanxun Ethan Wang

Kang-Lung Wang

Robert N Candler

Harry B Radousky

Abdon E Sepulveda

Joseph Devin Schneider

Mohanchandra Kotekar Panduranga

Christopher S Lynch

James C Y Dunn

Lisa R Hill

Francisco Peña

Shant Shekherdimian

Motoki Ujihara

Dong Gun Lee

Nersesse Nersessian

Peter A Jardine

Wenzhong Yan

Alexandre Bur

Zhi Yao

Anthony Barra

Elmer Wu

Jinzhao Hu

Kyle Wetzlar

Michael F Moon

Scott Richard Burnside

Laura Schelhas

Sidhant Tiwari

Jizhai Cui

Scott Michael Strutner

Hyungsuk Kim

Panduranga K Mohanchandra

Michael C Emmons

Tao Wu

A multiferroic antenna apparatus and method are described which provides increased energy efficiencies and ease of implementation. Magnetoelastic and/or magnetostrictive resonator are coupled to a piezoelectric substrate, along with electrodes coupled to its opposing surfaces. In receive mode the resonators create mechanical waves in response to being excited into magnetic oscillation by receiving electromagnetic radiation, and these mechanical waves coupled to the piezoelectric substrate causing it to generate an electrical output signal at said electrodes. In transmit mode an electrical signal coupled through the electrodes induces mechanical waves in the piezoelectric substrate directed to the resonators which are excited into magnetic oscillation to output electromagnetic waves.

Extremely electrically small antennas based on multiferroic materials

A system for measuring magnetic field gradients comprising a multi-bay support structure with a series of raised contact shoulders separated from each other by voids. An optical fiber is spaced along the length of the multi-cell support structure and traverses all the raised contact points and voids. The optical fiber has a plurality of Fiber Bragg gratings (FBGs) spaced lengthwise, each FBG suspended in a void. In addition, a plurality of ferromagnetic members are strung onto the optical fiber, each suspended in a void. Magnetic field gradients act on the ferromagnetic member to create localized tension in the optical fiber. The FBG's refractive indices are monitored, tension is calculated therefrom, and the tension is correlated to the magnetic field gradient. This greatly simplifies mechanical, optical, electronic and computational complexity and is bay suited for any FOSS array for measuring magnetic fields using many dense measurement points.

Optical fiber-based distributed sensing of magnetic field gradients

An antenna apparatus utilizing bulk acoustic wave (BAW) resonances to transfer dynamic strain across multiple layers, which include piezoelectric layers coupled to magnetostrictive material layers. In at least one embodiment, a piezoelectric layer is coupled to a magnetostrictive layer to which another layer having similar acoustic properties as the piezoelectric layer is coupled as an inertial buffer. These multiple layers comprise a strain media to provide a vertical multiferroic coupling which couples electric field, magnetic field, and mechanical fields. Electrodes are coupled to excite one of the piezoelectric layers for injecting acoustic waves into the structure from which electromagnetic radiation is generated out of the plane.

Bulk acoustic wave mediated multiferroic antennas

A vascular implant, comprising a sheet comprising thin film nickel titanium (NiTi), wherein the sheet has at least one super-hydrophilic surface having a water contact angle of less than approximately 5 degrees. The sheet is configured to have a compacted form having a first internal diameter and a deployed form having a second internal diameter larger than the first internal diameter. The sheet may be delivered into a blood vessel in the compacted form and expanded to its deployed form at a treatment location within the blood vessel, wherein the stent is configured to expand onto an internal surface of the blood vessel and exert a radial force on said internal surface.

Thin film vascular stent and biocompatible surface treatment

A flow diverter is described and fabricated using ultra-thin porous thin-film Nitinol, and is configured for implantation to a treatment site within a vessel for significant reduction in an intra-aneurismal flow velocity and vorticity. Using small size pores in a coverage area of only 10%, a 90% reduction in flow velocity into a pseudo-aneurysm can be achieved, with an almost immediate cessation of flow into an anatomical feature such as aneurysm sac in vivo. The size of the holes can be tailored to be any shape and range in size from 1-400 &#x3bc;m using photolithography and from 5-1000 nm using ebeam lithography.

Ultra-low fractional area coverage flow diverter for treating aneurysms and vascular diseases

Devices and methods for controlling magnetic anisotropy and orientation of magnetic single domain structures between stable states are provided based on piezoelectric thin films and patterned electrodes. By using patterned electrodes, piezoelectric strain is manipulated to achieve a highly localized biaxial strain in a piezoelectric substrate and rotate the magnetic anisotropy of magnetic materials. Reorientation of a magnetic single domain between different stable states is accomplished by pulsing voltage across pairs of electrodes. Since only a small region surrounding the electrodes is strained, the methods can be applied to arrays of indexed magnetic elements and to piezoelectric thin films clamped to silicon base substrates.

Devices and methods for controlling magnetic anisotropy with localized biaxial strain in a piezoelectric substrate

A method of fabricating a multiferroic antenna element may include providing a electroelastic substrate to transform mechanical oscillations into an acoustic wave, providing a resonator assembly on a surface of the electroelastic substrate where the resonator assembly includes a plurality of magnetoelastic resonators that transform an electromagnetic wave into mechanical oscillations corresponding to a frequency of the electromagnetic wave, and providing an interdigitated electrode assembly at a portion of the electroelastic substrate to convert the acoustic wave into an electrical signal preserving information associated with the frequency of the electromagnetic wave.

Multiferroic surface acoustic wave antenna

A multiferroic transducer for an electrical stringed-instrument pickup comprising an upper layer and lower layer of magnetostrictive material and a middle layer of piezoelectric or ferroelectric material disposed between the upper layer and lower layer.

Multiferroic transducer for audio applications

A magnetoelectric composite device having a free (i.e. switchable) layer of ferromagnetic nanocrystals mechanically coupled a ferroelectric single crystal substrate is presented, wherein application of an electrical field on the composite switches the magnetic state of the switchable layer from a superparamagnetic state having no overall net magnetization to a substantially single-domain ferromagnetic state.

Magnetoelectric control of superparamagnetism

The invention is a magneto-optic coupled magnetic sensor that comprises a standard optical fiber Bragg grating system. The system includes an optical fiber with at least one Bragg grating therein. The optical fiber has at least an inner core and a cladding that surrounds the inner core. The optical fiber is part of an optical system that includes an interrogation device that provides a light wave through the optical fiber and a system to determine the change in the index of refraction of the optical fiber. The cladding of the optical fiber comprises at least a portion of which is made up of ferromagnetic particles so that the ferromagnetic particles are subject to the light wave provided by the interrogation system. When a magnetic field is present, the ferromagnetic particles change the optical properties of the sensor directly.

Magneto-optic field coupling in optical fiber Bragg gratings

A ferroelectric device includes a first electrode, a second electrode spaced apart from the first electrode, and a ferroelectric element arranged between the first and second electrodes. The ferroelectric element has a plurality of quasistatic strain configurations that are selectable by the application of an electric field and the device has selectable electromechanical displacement by the application of the electric field.

Tunable and metastable ferroelectric materials and magneto-electric devices

An expandable mechanical distension device for hollow organ growth comprising a spring stent structure to elongate hollow organs by mechanical expansion. The device preferably expands radially to engage the internal walls of the hollow organ segment at a desired treatment location and expands axially to enlarge the hollow organ segment. The distension device may be configured for the treatment of patients with insufficient hollow viscus, e.g. hollow organ deficiency such as short gut syndrome, to enhance their gut length by mechanical force.

Expandable distension device for hollow organ growth

An inventive energy harvesting apparatus may include a ferromagnetic material and/or a shape memory alloys to convert thermal energy to mechanical energy to electrical energy. The apparatus is subjected to a thermal gradient to cause beams to bend thus creating stress/strain in a piezoelectric material, or creating magnetic flux in a magnetic path. The charges created in this process can be transferred to electrical batteries.

Energy harvesting by means of thermo-mechanical device utilizing bistable ferromagnets

A novel energy harvesting system and method utilizing a thermoelectric having a material exhibiting a large thermally induced strain (TIS) due to a phase transformation and a material exhibiting a stress induced electric field is introduced. A material that exhibits such a phase transformation exhibits a large increase in the coefficient of thermal expansion over an incremental temperature range (typically several degrees Kelvin). When such a material is arranged in a geometric configuration, such as, for a example, a laminate with a material that exhibits a stress induced electric field (e.g. a piezoelectric material) the thermally induced strain is converted to an electric field.

Energy harvesting using a thermoelectric material

Reconfigurable radiant energy reflectors ( ) of very low areal densities are formed of a laminate of a thin layer of a shape memory alloy ( ) and a thin film or membrane material ( ). The outer surface of the membrane provides the energy reflecting surface ( ) and a support member ( ) is attached to the laminate for application in a system. In a preferred embodiment, the shape memory alloy ( ) is compositionally graded ( ) and exhibits a two-way shape memory effect and a heater ( ) serves as the actuator to the reflector.

Thin film shape memory alloy reflector

Growing community of inventors

Los Angeles, CA, United States of America

Gregory Paul Carman