A5040284563- Magnetic and transport properties of perovskites and related materials
- Magnetic properties of thin films
- Advanced Condensed Matter Physics
- Electronic and Structural Properties of Oxides
- Multiferroics and related materials
- Magnetic Properties and Applications
- ZnO doping and properties
- Magnetic Properties of Alloys
- Physics of Superconductivity and Magnetism
- Theoretical and Computational Physics
- Characterization and Applications of Magnetic Nanoparticles
- Geomagnetism and Paleomagnetism Studies
- Organic Electronics and Photovoltaics
- Topological Materials and Phenomena
- Nuclear Physics and Applications
- Rare-earth and actinide compounds
- Atomic and Subatomic Physics Research
- Magnetic Field Sensors Techniques
- Ferroelectric and Piezoelectric Materials
- Advanced Memory and Neural Computing
- Thermal properties of materials
- Magneto-Optical Properties and Applications
- Metallic Glasses and Amorphous Alloys
- Heusler alloys: electronic and magnetic properties
- Conducting polymers and applications
NIST Center for Neutron Research
2015-2024
National Institute of Standards and Technology
2015-2024
National Tsing Hua University
2022
Institute for Energy Technology
2020
University of Florida
2019
Colorado State University
2019
University of South Florida
2016
National Institute of Standards
2011-2013
University of Delaware
2013
Universidad Complutense de Madrid
2011
Abstract The topological nature of magnetic skyrmions leads to extraordinary properties that provide new insights into fundamental problems magnetism and exciting potentials for novel technologies. Prerequisite are systems exhibiting skyrmion lattices at ambient conditions, which have been elusive so far. Here, we demonstrate the realization artificial Bloch over extended areas in their ground state room temperature by patterning asymmetric nanodots with controlled circularity on an...
Abstract Andreas Berger CICnanoGUNE BRTA Following the success and relevance of 2014 2017 Magnetism Roadmap articles, this 2020 edition takes yet another timely look at newly relevant highly active areas in magnetism research. The overall layout article is unchanged, given that it has proved most appropriate way to convey aspects today’s research a wide variety sub-fields broad readership. A different group experts again been selected for article, representing both breadth new areas, desire...
Polymer-based solar cell performance is dictated by nanoscale structures since the active layer suffers from extremely short exciton diffusion lengths. To understand structures' effect on we use neutron reflectivity to investigate thin film morphology containing a 1 : weight blend of [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) nanoparticles and poly(3-hexylthiophene) (P3HT). Neutron uniquely suited this system due large scattering length density contrast between two components, other...
Anderson localization in phonon heat conduction is observed GaAs/AlAs superlattices with ErAs nanodots.
We have observed long-range spin-triplet supercurrents in Josephson junctions containing ferromagnetic (F) materials, which are generated by noncollinear magnetizations between a central Co/Ru/Co synthetic antiferromagnet and two outer thin F layers. Here we show that the supercurrent is enhanced up to 20 times after our samples subject large in-plane field. This occurs because undergoes "spin-flop" transition, whereby Co layer end nearly perpendicular of report direct experimental evidence...
We investigate structural coupling of the MnO6 octahedra across a film/substrate interface and resultant changes physical properties ultrathin La2/3Sr1/3MnO3 (LSMO) films. In order to isolate effect interfacial octahedral behavior from that epitaxial strain, LSMO films are grown on substrates with different symmetry similar lattice parameters. Ultrathin show an increased magnetization electrical conductivity cubic (LaAlO3)0.3(Sr2AlTaO6)0.7 (LSAT) compared those orthorhombic NdGaO3 (NGO)...
Abstract Electric field control of magnetism provides a promising route towards ultralow power information storage and sensor technologies. The effects magneto-ionic motion have been prominently featured in the modification interface characteristics. Here, we demonstrate magnetoelectric coupling moderated by voltage-driven oxygen migration beyond relatively thick AlO x /GdO /Co(15 nm) films. Oxygen Co magnetization are quantitatively mapped with polarized neutron reflectometry under...
Abstract Ionic transport in metal/oxide heterostructures offers a highly effective means to tailor material properties via modification of the interfacial characteristics. However, direct observation ionic motion under buried interfaces and demonstration its correlation with physical has been challenging. Using strong oxygen affinity gadolinium, we design model system Gd x Fe 1− /NiCoO bilayer films, where migration is observed manifested controlled positive exchange bias over relatively...
We present an experimental and theoretical investigation of the influence a uniaxial magnetocrystalline anisotropy on magnetic textures that are formed in chiral system. show epitaxially induced tensile stress MnSi thin films grown Si(111) creates easy-plane anisotropy. The magnetoelastic shear coefficient is derived from SQUID magnetometry measurements combination with transmission electron microscopy x-ray diffraction data. Density functional calculations support conclusion originates...
Using polarized neutron reflectometry, we obtained separate depth profiles for pinned and unpinned magnetization across the interface of a ferromagnet/antiferromagnet bilayer as function sign exchange bias. The are nonuniform extend well beyond chemical interface, suggesting an interfacial region magnetically distinct from its surroundings. A model that includes moments in ferromagnet antiferromagnet is developed complete description data.
We have found ferromagnetism in epitaxially grown superlattices of CaRuO(3)/CaMnO(3) that arises one unit cell at the interface. Scanning transmission electron microscopy and energy loss spectroscopy indicate difference magnitude Mn valence states between center CaMnO(3) layer interface region is consistent with double exchange interaction among ions Polarized neutron reflectivity thickness dependence bias field together interfacial only limited to each The moment alternates 1 μ(B)/interface...
Magnetic exchange driven proximity effect at a magnetic-insulator-topological-insulator (MI-TI) interface provides rich playground for novel phenomena as well way to realize low energy dissipation quantum devices. Here we report dramatic enhancement of coupling in the MI/magnetic-TI EuS/Sb(2-x)V(x)Te3 hybrid heterostructure, where V doping is used drive TI (Sb2Te3) magnetic. We observe an artificial antiferromagneticlike structure near MI-TI interface, which may account enhanced coupling....
Thin films of Bi2Te3 and Bi2Se3 have been grown on deoxidized GaAs(001) substrates using molecular beam epitaxy. Cross-sectional transmission electron microscopy established the highly parallel nature Te(Se)-Bi-Te(Se)-Bi-Te(Se) quintuple layers deposited slightly wavy GaAs substrate surface different crystal symmetries two materials. Raman mapping confirmed presence strong characteristic peaks reported previously for these materials in bulk form. The overall quality reveals potential...
We observe interfacial ferromagnetism in superlattices of the paramagnetic metal LaNiO3 and antiferromagnetic insulator CaMnO3. exhibits a thickness dependent metal-insulator transition we find emergence to be coincident with conducting state LaNiO3. That is, only which layers are metallic exhibit ferromagnetism. Using several magnetic probes, have determined that arises single unit cell CaMnO3 at interface. Together these results suggest can attributed double exchange interaction among Mn...
Geometric Hall effect is induced by the emergent gauge field experienced carriers adiabatically passing through certain real-space topological spin textures, which a probe to non-trivial such as magnetic skyrmions. We report experimental indications of spin-texture charges in heterostructures insulator (Bi,Sb)2Te3 coupled an antiferromagnet MnTe. Through seeding effect, pinned spins at interface leads tunable modification averaged charge. This experimentally manifests field-dependent...
A tabletop setup for imaging antiferromagnetic order shows how electron spin domains in a thin film of NiO respond to an external electric current, useful insight building fast computer memories.
Preventing stray magnetic interactions is important to improving technology that relies upon manipulating an electron's charge and spin. To this end, the authors investigate a binary intermetallic has internal field, yet does not affect spin of surrounding components. As-grown epitaxial thin films Mn${}_{3}$Al on GaAs(001) present ideal D0${}_{3}$ Heusler phase. This compound should be quite interesting for optimizing tomorrow's spintronic devices.
The coexistence and coupling of ferroelasticity magnetic ordering in a single material offers great opportunity to realize novel devices with multiple tuning knobs. Complex oxides are particularly promising class materials find multiferroic interactions due their rich phase diagrams, sensitive external perturbations. Still, there very few examples these systems. Here, we report the observation twin domains ferroelastic LaCoO3 epitaxial films geometric control structural symmetry intimately...
Engineering magnetic anisotropy in two-dimensional systems has enormous scientific and technological implications. The uniaxial universally exhibited by magnets only two stable spin directions, demanding 180 degrees switching between states. We demonstrate a novel eightfold SrRuO3 monolayers inducing reorientation (SrRuO3)1/(SrTiO3)N superlattices, which the easy axis of Ru spins is transformed from <001> direction (N = 1 2) to <111> directions 3, 4 5). This enables 71 109 monolayers,...
Depth grading of magnetic anisotropy in perpendicular media has been predicted to reduce the field required write data without sacrificing thermal stability. To study this prediction, we have produced Co/Pd multilayers with depth-dependent Co layer thickness. Polarized neutron reflectometry shows that thickness results a corresponding gradient. Magnetometry reveals gradient promotes domain nucleation upon magnetization reversal---a clear experimental demonstration effectiveness graded for...
The newly-developing spintronics technology requires materials that allow control of both the charge and spin degrees freedom carriers. Ferromagnetic semiconductors (SC) are considered suitable due to simultaneous presence magnetic order semiconducting properties. GaMnAs is one most intensively studied ferromagnetic SC. In this paper we will review recent research accomplishments regarding two technologically important properties – anisotropy interlayer coupling — GaMnAs-based multilayer...
This review focuses on the magnetocaloric effect with special attention to nanoscale thin films and heterostructures. The authors outline general phenomenon of discuss how using materials in reduced dimensions can impact this emerging area. note works significance date highlight features emanating from community. They provide important details related sample fabrication, relevant metrology, advanced data analyses, all which are done a tutorial fashion. Finally, an outlook for application...