A5067426847- Magnetic and transport properties of perovskites and related materials
- Multiferroics and related materials
- Ferroelectric and Piezoelectric Materials
- Advanced Condensed Matter Physics
- Electronic and Structural Properties of Oxides
- Advanced Memory and Neural Computing
- 2D Materials and Applications
- High-pressure geophysics and materials
- Nuclear materials and radiation effects
- Ferroelectric and Negative Capacitance Devices
- Neuroscience and Neural Engineering
- Crystal Structures and Properties
- Smart Materials for Construction
- Perovskite Materials and Applications
- MXene and MAX Phase Materials
- ZnO doping and properties
- Underwater Acoustics Research
- Chalcogenide Semiconductor Thin Films
- Heusler alloys: electronic and magnetic properties
- Magnetic properties of thin films
- Rare-earth and actinide compounds
- Surface Roughness and Optical Measurements
- Characterization and Applications of Magnetic Nanoparticles
- Magnetic Properties and Applications
Paul Scherrer Institute
2021-2024
Istituto Officina dei Materiali
2019-2024
AREA Science Park
2018-2024
ETH Zurich
2021-2023
University of Milan
2018-2021
University of British Columbia
2020
Institute for Microelectronics and Microsystems
2020
Mylan (Switzerland)
2018
Controlling magnetism by using electric fields is a goal of research towards novel spintronic devices and future nano-electronics. For this reason, multiferroic heterostructures attract much interest. Here we provide experimental evidence, supporting DFT analysis, transition in La0.65Sr0.35MnO3 (LSMO) thin film to stable ferromagnetic phase, that induced the structural strain properties ferroelectric BaTiO3 (BTO) substrate, which can be modified applying external fields. X-ray Magnetic...
Here, we present an integrated ultra-high vacuum apparatus-named MBE-Cluster -dedicated to the growth and in situ structural, spectroscopic, magnetic characterization of complex materials. Molecular Beam Epitaxy (MBE) metal oxides, e.g., manganites, deposition patterned metallic layers can be fabricated characterized by reflection high-energy electron diffraction, low-energy Auger spectroscopy, x-ray photoemission azimuthal longitudinal magneto-optic Kerr effect. The temperature controlled...
Converse magnetoelectric coupling in artificial multiferroics is generally modelled through three possible mechanisms: charge transfer, strain mediated or ion migration. Here we demonstrate a novel and highly reliable approach, where electrically controlled morphological modifications control the ferromagnetic response of heterostructure, specifically FexMn1-x films on ferroelectric PMN-PT (001) substrates. The substrates present, correspondence to electrical switching, fully reversible...
Resistive switching oxides are highly attractive candidates to emulate synaptic behaviour in artificial neural networks. Whilst the most widely employed systems exhibit filamentary resistive switching, interface-type based on a tunable tunnel barrier of increasing interest, since their gradual SET and RESET processes provide an analogue-type required take over functionality. Interface-type devices often consist bilayers one mixed-conductive oxide layer insulating layer. However, used for...
Ferroionic materials combine ferroelectric properties and spontaneous polarization with ionic phenomena of fast charge recombination electrodic functionalities. In this paper, we propose the concept tunable in CeO
In orthoferrites the rare-earth (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mi>R</a:mi></a:mrow></a:math>) ion has a big impact on structural and magnetic properties; in particular, ionic size influences octahedral tilt <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mrow><b:msup><b:mrow><b:mi>R</b:mi></b:mrow><b:mrow><b:mn>3</b:mn><b:mo>+</b:mo></b:mrow></b:msup><b:mtext>−</b:mtext><b:mi mathvariant="normal">F</b:mi><b:msup><b:mrow><b:mi...
A ferromagnetic (FM) thin film deposited on a substrate of $\mathrm{Pb}({\mathrm{Mg}}_{1/3}{\mathrm{Nb}}_{2/3}){\mathrm{O}}_{3}\text{\ensuremath{-}}{\mathrm{PbTiO}}_{3}$ (PMN-PT) is an appealing heterostructure for the electrical control magnetism, which would enable nonvolatile memories with ultralow-power consumption. Reversible and electrically controlled morphological changes at surface PMN-PT suggest that magnetoelectric effects are more complex than commonly used ``strain-mediated''...
We investigated the relationship between ferromagnetism and metallicity in strained La0.67Ca0.33MnO3 films grown on lattice-mismatched NdGaO3 (001) by means of spectroscopic techniques directly sensitive to ferromagnetic state, band structure, chemical state atoms. In this system, metallic (FMM) phase spatially coexists with an insulating one most diagram. First, observation almost 100% spin polarization photoelectrons at Fermi level fundamental provides direct evidence half-metallicity FMM...
Understanding the short-range structure of an amorphous material is first step in predicting its macroscopic properties. Amorphous strontium titanate (a-STO) presents a unique challenge due to contradictory experimental findings regarding local oxygen environment titanium, concluded be either tetrahedral or octahedral. To elucidate discrepancy, 72 models a-STO with density ranging from crystalline value 5.12 $3.07\phantom{\rule{4pt}{0ex}}\mathrm{g}/{\mathrm{cm}}^{3}$ were prepared using ab...
Metallic ferromagnetic transition metal dichalcogenides have emerged as important building blocks for scalable magnonics and memory applications. Downscaling such systems to the ultra-thin limit is critical integrate them into technology. Here, we achieved layer-by-layer control over dichalcogenide Cr$_{1.6}$Te$_{2}$ by using pulsed laser deposition, uncovered minimum thickness above which room temperature magnetic order maintained. The electronic structure explored experimentally...
Metallic ferromagnetic transition metal dichalcogenides have emerged as important building blocks for scalable magnetic and memory applications. Downscaling such systems to the ultrathin limit is critical integrate them into technology. Here, we achieved layer-by-layer control over dichalcogenide Cr1.6Te2 by using pulsed laser deposition, uncovered minimum thickness above which room-temperature order maintained. The electronic structures are explored experimentally theoretically, it shown...
In orthoferrites the rare-earth (R) ion has a big impact on structural and magnetic properties in particular ionic size influences octahedral tilt R3+- Fe3+ interaction modifies like spin reorientation. Growth induced strain thin films is another means to modify materials since sign of affects bond length therefore directly orbital interaction. Our study focuses epitaxially grown (010) oriented DyFeO3 LuFeO3 films, thereby investigating compressive lattice magnetically active Dy3+ inactive...
Multiferroic heterostructures have gained in recent years a renewed role spintronic applications due to their possibility controlling the magnetic properties via interfacial coupling by exploiting ferroelectric response various external stimuli. Whereas main mechanisms ruling converse magnetoelectric are considered as established, research on how optimize is an active field. In particular complex phase diagram of [Pb(Mg1/3Nb2/3)O3]-x[PbTiO3] (PMN-xPT) single crystals, that present relaxor...
In article number 1900150, Giovanni Vinai and co-workers show that electrical switching in FexMn1−x/PMN-PT causes surface cracks 100-nm deep to reversibly appear disappear from the of a sample. Corresponding these morphological changes, XMCD micro-MOKE measurements magnetic response FexMn1−x is also locally modified.
Exploiting first-principles simulations and x-ray absorption near edge spectroscopy (XANES) in high magnetic fields, we investigated the properties of thin films zirconia doped with Fe impurities. In our ${\mathrm{Zr}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x}{\mathrm{O}}_{2\ensuremath{-}y}$ samples, grown by atomic layer deposition (ALD), dopants are uniformly distributed, ranging from diluted ($x\ensuremath{\simeq}2\text{--}3%$) up to ($x\ensuremath{\simeq}25%$) concentration. By circular...
We show reversible room temperature control of the Ti band structure in SrTiO<sub>3</sub>–CoFe<sub>2</sub>O<sub>4</sub> heterostructures exploiting CoFe<sub>2</sub>O<sub>4 </sub>magnetostriction. Changes as a function applied magnetic field suggest development net electric polarization.
Metamaterials, fabricated by assembling different compounds at the nanoscale, can have properties not found in naturally occurring materials, and therefore offer new avenues to develop novel devices. In realm of spintronics, where spin electrons is used extend capabilities electronic devices, quest for such functional materials has expanded towards magnetic oxides. Here, finding methods control their anisotropy crucial achieve higher memory density longer stability. order address this...