A5070412187- Magnetic properties of thin films
- Magnetic Properties and Applications
- Advanced Memory and Neural Computing
- Ferroelectric and Negative Capacitance Devices
- ZnO doping and properties
- Conducting polymers and applications
- Advanced Sensor and Energy Harvesting Materials
- Advanced Thermoelectric Materials and Devices
- Semiconductor materials and devices
- Magneto-Optical Properties and Applications
- Surface and Thin Film Phenomena
- Characterization and Applications of Magnetic Nanoparticles
- Nanoporous metals and alloys
- Geophysical and Geoelectrical Methods
- Non-Destructive Testing Techniques
- Geophysical Methods and Applications
- Heusler alloys: electronic and magnetic properties
- Quantum and electron transport phenomena
- Magnetic Field Sensors Techniques
Nanyang Technological University
2019-2023
Institute of Materials Research and Engineering
2019-2022
Agency for Science, Technology and Research
2019-2022
GlobalFoundries (Singapore)
2020-2021
Current-induced magnetization switching by spin–orbit torque generated in heavy metals offers an enticing realm for energy-efficient memory and logic devices. The spin Hall efficiency is a key parameter describing the generation of current. Recent findings have reported enhancement mechanical strain, but its origin remains elusive. Here, we demonstrate 45% increase platinum/cobalt (Pt/Co) bilayer, which 78% was preserved even after strain removed. Spin transparency X-ray magnetic circular...
Abstract High temperature studies of spin Hall effect have often been neglected despite its profound significance in real-world devices. In this work, high torque ferromagnetic resonance measurement was performed to evaluate the effects on Gilbert damping and efficiency Pt x Cu 1− . When varied from 300 K 407 K, relatively stable with a change 4% at composition = 66%. Alloying improved 75 25 /Co/Ta by 29% value 0.31 ± 0.03 K. However, critical switching current density is dependent ratio...
We report the giant spin current generation in CuTb alloys arising from Hall effect. The maximum angle our CuTb-based magnetic heterostructures was found to be -0.35 ± 0.02 for Cu0.39Tb0.61. find that contribution of skew scattering is larger than side jump lower Tb concentrations (<14.9%), while converse true higher concentrations. Additionally, we also studied Gilbert damping parameter, diffusion length, and spin-mixing conductance. Interfacial transparency 0.55 0.03 CoFeB/Cu0.53Tb0.47...
We report on the enhancement of spin Hall angle from CoFeB/Pt interface by introducing nitrogen into Pt thin film. Spin-torque ferromagnetic resonance measurements effective (θSH) reveal a non-monotonic variation as function amount gas introduced, Q in film deposition, which peaks at θSH = 0.16 when is 8%. Our analysis shows that mainly attributed to increase spin-dependent scattering interface. The magnetic damping decreases with increasing due reduced spin–orbit coupling. interfacial...
Abstract The use of voltage-controlled magnetic anisotropy (VCMA) via the creation a sloped electric field has been hailed as an energy-efficient approach for domain wall (DW) propagation. However, this method suffers from limitation nanowire length which DW can propagate on. Here, we propose multiplexed gate electrodes to DWs on nanowires without having any constraints. multi-gate electrode configuration is demonstrated using micromagnetic simulations. This allows controllable voltages be...
A comprehensive understanding of numerous electrical current-induced magnetic texture transformations is necessary to ensure the reliability skyrmionic devices during operation. Here, we present an experimental study unipolar skyrmion-stripe transformation in a $\mathrm{Pt}/\mathrm{Co}/\mathrm{Fe}/\mathrm{Ir}$ bilayer. High current density pulses induce densely packed skyrmion state, as commonly reported many other studies, and nucleation expected lessen with diminishing density. However, at...
We propose the use of mechanical strain and mild annealing to achieve reversible modulation spin–orbit torque (SOT) Gilbert damping parameter. X-ray diffraction results show that residual enhancement reduction, due post-mechanical treatment, can be reset using alleviate internal strain. The spin Hall efficiency heat- strain-treated Pt/Co bilayer was characterized through spin-torque ferromagnetic resonance, it found device could switch between enhanced SOT pristine state. parameter behaves...
We report the influence of ultrathin Ti insertion layer on effective magnetic damping and spin Hall angle in Co/[Pt/Ti]n/Pt structures via spin-torque ferromagnetic resonance measurements. The shows a non-monotonic variation as function layers number n, reaching minimum at n = 5. Our analysis that when is less than 5, mainly related to thickness bottom Pt layer, it greater attenuation currents leads increased damping. first decreases increases, n=5, then increases with further n. observation...
We performed a temperature-modulated first-order reversal curve (FORC) study on Pt/Co/Fe/Ir magnetic stack that exhibited phase transition from isolated skyrmions to skyrmion lattice with increasing temperature. Using in situ magneto-optical Kerr imaging, generalized description of domain transformations associated the FORC distribution peaks at both their and sweeping field are derived allow for direct analysis diagram. The peak, which is commonly ignored analysis, identified as process...
Abstract A facile method was demonstrated to prepare large‐area (∼100 cm 2 ), conductive poly(3,4‐ethylenedioxythiophene):polystyrene sulfonate (PEDOT : PSS) dense film via post‐treatment with sulfuric acid at 160 °C on a glass substrate. This PEDOT PSS films exhibited high electrical conductivity of up 1800 S −1 without significantly compromising the humidity level, and could be easily transferred onto various flexible substrates such as plastics paper excellent adhesion. The can made...