A5022849427- Magnetic properties of thin films
- Advanced Memory and Neural Computing
- Magnetic and transport properties of perovskites and related materials
- Advanced Antenna and Metasurface Technologies
- Metamaterials and Metasurfaces Applications
- Plasmonic and Surface Plasmon Research
- Multiferroics and related materials
- Ferroelectric and Negative Capacitance Devices
- ZnO doping and properties
- Antenna Design and Analysis
- Neural Networks and Reservoir Computing
- Optical Coatings and Gratings
- Near-Field Optical Microscopy
- Neural dynamics and brain function
- Gold and Silver Nanoparticles Synthesis and Applications
- Physics of Superconductivity and Magnetism
- Characterization and Applications of Magnetic Nanoparticles
- Neural Networks and Applications
- Quantum and electron transport phenomena
- Metallic Glasses and Amorphous Alloys
- Phase-change materials and chalcogenides
- Quantum Dots Synthesis And Properties
- Solidification and crystal growth phenomena
- Magnetic Properties and Applications
- Perovskite Materials and Applications
Agency for Science, Technology and Research
2014-2025
Institute of Materials Research and Engineering
2019-2025
Data Storage Institute
2014-2018
Wavefront manipulation in metasurfaces typically relies on phase mapping with a finite number of elements. In particular, discretized linear profile may be used to obtain beam bending functionality. However, discretization limits the applicability this approach for high angle due drastic efficiency drop when is mapped by small work, we discuss novel concept energy redistribution diffraction gratings and its application visible spectrum range, which helps overcome constraints ultrahigh (above...
Abstract Metasurfaces enable the full control of electromagnetic waves over a wide spectrum. High‐efficiency transmissive metasurfaces have been demonstrated up to visible frequencies by using dielectrics. However, extending operating spectrum ultraviolet range is challenging. This due strong absorption in typical dielectric materials and inexhaustive understanding magnetic resonances nanostructures. Here, large‐bandgap material—niobium pentoxide (Nb 2 O 5 )—is introduced engineer geometric...
Although Si acts as an electrical semiconductor, it has properties of optical dielectric. Here, we revisit the behavior a plasmonic metal. This was previously shown to arise from strong interband transitions that lead negative permittivity across ultraviolet spectral range. However, few have studied characteristics Si, particularly in its nanostructures. In this paper, report localized plasmon resonances nanostructures and observation hybridization UV (∼250 nm wavelength). addition,...
The quest to mimic the multistate synapses for bioinspired computing has triggered nascent research that leverages well-established magnetic tunnel junction (MTJ) technology. Early works on spin transfer torque MTJ-based artificial neural network (ANN) are susceptible poor thermal reliability, high latency, and critical current densities. Meanwhile, work spin–orbit (SOT) ANN mainly utilized domain wall motion, which yields negligibly small readout signals differentiating consecutive states...
Spin-orbit torque (SOT) control of magnetization is being rapidly positioned for energy-efficient computing across various memory hierarchies. Concurrently, the study intrinsic and extrinsic factors, such as doping, to enhance SOT considerable scientific interest. Here, we introduce 2% nominally doped oxygen via postdeposition flow in β-phase tungsten, one most promising materials, create laminated [W/O] structures. Incorporating them into annealed multilayer stacks compatible with...
Combining physics with computational models is increasingly recognized for enhancing the performance and energy efficiency in neural networks. Physical reservoir computing uses material dynamics of physical substrates temporal data processing. Despite ease training, building an efficient remains challenging. Here, we explore beyond conventional delay-based reservoirs by exploiting spatiotemporal transformation all-electric spintronic devices. Our nonvolatile effectively transforms history...
Tuning quantum emission to a specific wavelength at room temperature holds significant promise for enhancing secure communication, particularly by aligning with the Fraunhofer lines in solar spectrum. The integration of emitters phase-change materials enables modulation, especially when strong field enhancement is present. Antimony telluride (Sb2Te3) exhibits potential facilitate this functionality through its support interband plasmonics and behavior. In study, Sb₂Te₃ antennae are designed...
In this article, we investigate the effect of electric-field on perpendicular magnetic anisotropy (PMA) and strain properties in nanoscaled CoFeB/MgO tunnel junction using magnetoresistance piezoresponse force microscopy (PFM) measurements, respectively. We show that while PMA change under is consistent with previous reports, PFM data applied induces a MgO. demonstrate development compressive tensile strains corresponding to different polarities electric-field. discuss interplay between...
The discovery of chiral spin texture has unveiled many unusual yet extraordinary physical phenomena, such as the Néel type domain walls and magnetic skyrmions. A recent theoretical study suggests that a exchange interaction is not limited to single ferromagnetic layer; instead, three-dimensional textures can arise from an interlayer Dzyaloshinskii-Moriya interaction. However, influence coupling on electrical manipulation magnetization rarely been addressed. Here, coexistence both symmetric...
Current-induced spin–orbit torque (SOT) facilitates the ultrafast electrical manipulation of magnetic tunnel junction (MTJ), which is a leading non-volatile technology for microelectronic industry. The key bottleneck to commercial application SOT-MTJ absence practicable symmetry-breaking scheme switch perpendicular magnetization without an external field. Here, we demonstrate wafer-scale realization internalized field-free switching in using conventional materials and device structure. We...
We demonstrate an electric-field-tunable magnetic-field-sensor based on CoFeB/MgO magnetic tunnel junction with interfacial perpendicular anisotropy (PMA). From the dynamic lock-in measurements, we show that applied electric-field induces a peak in sensor voltage (VSENSOR) around free layer magnetization switching regime response to external a.c. field. Detailed measurements of VSENSOR as functions thickness, field amplitude and frequency reveal sensitivity can be up 80.8 V cm−1 Oe−1 under...
Cheap large-scale fabrication of ordered nanostructures is important for multiple applications in photonics and biomedicine including optical filters, solar cells, plasmonic biosensors, DNA sequencing. Existing methods are either expensive or have strict limitations on the feature size complexity. Here, we present a laser-based technique, nanoparticle lithography, which capable rapid arrays sub-50 nm holes various substrates. It based near-field enhancement melting induced under...
Abstract Multi‐state spin‐orbit torque (SOT) switching, particularly in magnetic tunnel junction (MTJ) geometry, is promising hardware for artificial intelligence due to its potential form neurons and increase storage density per bit. Here, multi‐state switching demonstrated Pt/Co 40 Fe B 20 /MgO‐based elliptical MTJ, fabricated on a 200 mm wafer platform, using nanosecond pulses. achieved MTJs composed of single ferromagnetic layer without resorting any domain‐wall pinning step. The genesis...
A bimodal approach to enhance cognitive accuracies by tuning the magnetoresistance and multistate in a compound spin synapse is developed.
We studied the spin torque switching in dual MgO layer based magnetic tunnel junctions (MTJs) by incorporating an ultra-thin (0.5 nm) Ta at CoFeB free layer/top interface. The incorporated MTJ showed a significant reduction (∼30%) critical current density (JC0 ) as compared to that of control whilst maintaining same tunneling magnetoresistance well thermal stability. JC0 can be attributed perpendicular anisotropy arising from incorporation ultrathin with MgO|CoFeB structure. This scheme...
Magnetoelectric coupling between magnetic and electric dipoles is one of the cornerstones modern physics towards developing most energy-efficient data storage. Conventionally, magnetoelectric achieved in single-phase multiferroics or composite nanostructures consisting ferromagnetic ferroelectric/piezoelectric materials. Here, we demonstrate an electric-field-induced strain-mediated effect ultrathin CoFeB/MgO tunnel junction employing non-piezoelectric material, which a vitally important...
Metasurfaces with spatially varying subwavelength structures enable full control of electromagnetic waves over a wide spectrum. High-efficiency metasurfaces, especially in transmission mode, are practical significance optical elements and systems, hitherto their operating frequencies have been expanded down to visible-wavelength ranges. Challenges developing shorter-wavelength metasurfaces originate from loss caused by strong absorption for most high-refractive-index materials. Here we...