A5058707317- Multiferroics and related materials
- Magnetic properties of thin films
- Ferroelectric and Piezoelectric Materials
- Magnetic and transport properties of perovskites and related materials
- Characterization and Applications of Magnetic Nanoparticles
- Acoustic Wave Resonator Technologies
- Advanced Condensed Matter Physics
- Ultrasonics and Acoustic Wave Propagation
- Quantum many-body systems
- Smart Materials for Construction
- Shape Memory Alloy Transformations
- Micro and Nano Robotics
- Microfluidic and Bio-sensing Technologies
- Electric Motor Design and Analysis
- Physics of Superconductivity and Magnetism
- Advanced Materials and Mechanics
- Magnetic Properties and Applications
- Metamaterials and Metasurfaces Applications
- Electromagnetic wave absorption materials
Bariloche Atomic Centre
2025
Consejo Nacional de Investigaciones Científicas y Técnicas
2025
Comisión Nacional de Energía Atómica
2025
University of California, Los Angeles
2016-2021
Northrop Grumman (United States)
2020
California State University, Northridge
2016
We present an experimental study of the magnetoelectric coupling in Fe-Ga/Pb[(Mg1/3Nb2/3)O3]0.68-[PbTiO3]0.31 thin-film multiferroic composite using x-ray magnetic circular dichroism and ferromagnetic resonance (FMR). Our measurements show evidence for a charge-mediated mechanism, suggested by asymmetric remanence (Mrem) behavior under opposite electric fields (±E) field (Hr) FMR measurements. Also, reveal perpendicular anisotropy that can be related to interface charge effect it is tunable...
We describe a spin wave modulator - spintronic device aimed to control propagation by an electric field. The consists of ferromagnetic film serving as bus combined with synthetic multiferroic comprising piezoelectric and magnetostrictive materials. Its operation is based on the stress-mediated coupling between By applying field layer, stress produced. In turn, changes direction easy axis in layer affects transport. present experimental data prototype consisting [Pb(Mg1/3Nb2/3)O3](1-x)...
Strain-mediated thin film multiferroics comprising piezoelectric/ferromagnetic heterostructures enable the electrical manipulation of magnetization with much greater efficiency than other methods; however, investigation nanostructures fabricated from these materials is limited. Here we characterize ferromagnetic Ni grown on a ferroelectric [Pb(Mg1/3Nb2/3)O3]0.68[PbTiO3]0.32 substrate using scanning electron microscopy polarization analysis (SEMPA) and micromagnetic simulations. The can be...
The converse magnetoelectric (CME) coefficient of an artificial, multiferroic composite cylinder was determined for two interface boundary conditions; specifically epoxy-bonded and shrink-fit. consists concentrically bonded rings with the inner outer made from Terfenol-D lead zirconate titanate, respectively. diameter annulus 25 mm, ring 30 mm. Electric fields ranging 20 kV/m to 80 AC components cycling at frequencies 4 kHz 50 were applied actuation composite. A magnetic bias field 0 Oe 2300...
Enhancing the magnetoelectric coupling in a strain-mediated multiferroic composite structure plays vital role controlling magnetism by electric fields. An enhancement of magnetoelastic between ferroelectric single crystal (011)-cut [Pb(Mg1/3Nb2/3)O3](1-x)-[PbTiO3]x (PMN-PT, x≈ 0.30) and ferromagnetic polycrystalline Ni thin film through an interposed benzocyclobutene polymer is reported. A nearly twofold increase sensitivity remanent magnetization to applied field observed. This observation...
Nanomagnetic logic has emerged as a potential replacement for traditional CMOS-based because of superior energy-efficiency. One implementation nanomagnetic employs shape-anisotropic (e.g. elliptical) ferromagnets (with two stable magnetization orientations) binary switches that rely on dipole-dipole interaction to communicate information. Normally, circular nanomagnets are incompatible with this approach since they lack distinct in-plane orientations encode bits. However, magnetoelastic can...
Terfenol-D thin films have the largest magnetoelastic coefficient at room temperature of any material system and thus are ideal for voltage induced strain multiferroics. However, requires 500 0C processing which prohibits its use in CMOS devices where temperatures must be below 450 0C. In this paper, we describe a deposition process that produces quality film with These extremely smooth surfaces (Ra∼1nm) excellent properties (λs=880 microstrain) similar to bulk polycrystalline counterpart....
The magnetoelectric properties of exchange-coupled Ni/CoFeB-based composite multiferroic microstructures are investigated. strength and sign the magnetoelastic effect found to be strongly correlated with ratio between thicknesses two magnetostrictive materials. In cases where thickness deviates significantly from one, behavior is dominated by thicker layer, which contributes more observed effect. More symmetric structures a equal one show an emergent interfacial cannot accounted for simply...
Designing and implementing means of locally trapping magnetic beads understanding the factors underlying bead capture force are important steps toward advancing capture-release process particles for biological applications. In particular, capturing magnetically labeled cells using microstructures with perpendicular anisotropy (PMA) will enable an approach to cell manipulation emerging lab-on-a-chip devices. Here, a Co (0.2 nm)/Ni (0.4 nm) multilayered structure was designed exhibit strong...
Software-defined radio (SDR) requires multi-use or reconfigurable radio-frequency front ends, with filters capable of dynamically shifting their operating frequencies. Current approaches to tunable typically require prohibitively large electric fields achieve tuning. This study utilizes a multiferroic approach, an field straining magnetoelastic elements tune the system's magnetic resonance. Furthermore, dipole coupling yields mode splitting, for additional resonance peaks that depend on...
Current research on artificial spin ice (ASI) systems has revealed unique hysteretic memory effects and mobile quasi-particle monopoles controlled by externally applied magnetic fields. Here, we numerically demonstrate a strain-mediated multiferroic approach to locally control the ASI monopoles. The magnetization of individual lattice elements is applying voltage pulses piezoelectric layer resulting in strain-induced precession timed for 180° reorientation. model demonstrates localized move...
As a candidate material for applications such as magnetic memory, polycrystalline antiferromagnets offer the same robustness to external fields, THz spin dynamics, and lack of stray field their single crystalline counterparts, but without limitation epitaxial growth lattice matched substrates. Here, we first report detection average Neel vector orientiation in NiO via Hall magnetoresistance (SMR). Secondly, by applying strain through piezo-electric substrate, reduce critical required reach...
This paper presents numerical and experimental data for dipole-dipole coupled Ni nanodots on a piezoelectric [Pb(Mg1/3Nb2/3)O3]0.68[PbTiO3]0.32 substrate. Simulation results show that the dipole coupling produces artificial ferromagnetic (parallel magnetization alignment in nanodot arrays) behavior can be modified to antiferromagnetic with an applied voltage. Experimental trends Mr Hc predicted by model, but discrepancies arise due geometric defects present fabricated samples. Geometric are...
The magnetoelastic behavior of multiferroic heterostructures-coupling magnetic anisotropy or domain dynamics to structural deformations-has been intensively studied for developing materials energy-efficient, spin-based applications. Here, we report on a large, interface-dominated magnetostriction in (Co/Ni)4/Pb(Mg1/3Nb2/3)O3-PbTiO3 heterostructures. Ferromagnetic resonance spectroscopy under voltage-induced strains enabled estimation the saturation as function Ni thickness. volume and...
In this work, we investigate magneto-acoustic attenuation in thin film multiferroic Lamb wave delay lines. By leveraging interactions, multiferroics have potential to realize passive chip-scale alternatives bulky ferrite devices. For the first time, magnetic field dependence of interactions devices is characterized. Multiferroic heterostructures aluminum nitride and cobalt iron boron are fabricated into lines operating at 7.492 GHz study effect strain nonuniformity on coupling. The waves...
A magnetic dipole-coupled magnetoelectric heterostructure comprised of three closely spaced ellipse shapes was designed and shown to be capable achieving deterministic in-plane magnetization rotation. The design approach used a combination conventional micromagnetic simulations obtain preliminary configurations followed by using fully strain-coupled, time domain code for detailed assessment performance. has short run times refine the shape orientation, but it does not accurately capture...
Nanomagnetic oscillators are key components for radio-frequency (RF) signal generation in nanoscale devices. However, these primarily electric current-based, which is energy inefficient at the due to ohmic losses. In this study, we present an actuation mechanism magnetization switching using a multiferroic structure that relies on RF voltage input instead of electrical current. An AC with DC bias applied piezoelectric substrate and magnetic nanodisk perpendicular anisotropy attached onto...
Strain-mediated thin film multiferroics comprising piezoelectric/ferromagnetic heterostructures enable the electrical manipulation of magnetization with much greater efficiency than other methods; however, investigation nanostructures fabricated from these materials is limited. Here we characterize ferromagnetic Ni grown on a ferroelectric PMN-PT substrate using scanning electron microscopy polarization analysis (SEMPA) and micromagnetic simulations. The can be controlled combination sample...
Strain-mediated multiferroic heterostructures relying on fast 180° precessional magnetic switching have been proposed as a pathway for energy efficient and high density memory/logic devices. However, proper device performance requires precisely timed frequency (~GHz) voltage pulses dependent the magnetization dynamics of structure. In turn, dynamic response is greatly influenced by geometry, strain amplitude, rate. Hence, we study effects increasing amplitude application rate in-plane...