A5023025347- Magnetic properties of thin films
- Magnetic Properties and Applications
- ZnO doping and properties
- Quantum and electron transport phenomena
- Magnetic Properties of Alloys
- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Characterization and Applications of Magnetic Nanoparticles
- Metallic Glasses and Amorphous Alloys
- Magneto-Optical Properties and Applications
- Advanced Memory and Neural Computing
- Heusler alloys: electronic and magnetic properties
- Theoretical and Computational Physics
- Multiferroics and related materials
- Electronic and Structural Properties of Oxides
- Ferroelectric and Piezoelectric Materials
- Magnetic Properties and Synthesis of Ferrites
- Advanced Condensed Matter Physics
- Copper Interconnects and Reliability
- Semiconductor materials and devices
- Quasicrystal Structures and Properties
- Copper-based nanomaterials and applications
- Semiconductor materials and interfaces
- Advanced Materials Characterization Techniques
- Nanocluster Synthesis and Applications
State Key Laboratory of Crystal Materials
2013-2025
Shandong University
2016-2025
Shandong Jiaotong University
2019
State Council of the People's Republic of China
2016
University of California, Santa Barbara
2016
University of Wollongong
2016
Shandong Institute of Metrology
2012
University of Alabama
2002-2010
Max Planck Institute of Microstructure Physics
2000-2002
Nanjing University
1995-1998
[Fe49Pt51]88Ag12 nanoparticles were prepared by the simultaneous polyol reduction of platiunum acetylacetonate and silver acetate thermal decomposition iron pentacarbonyl, giving 3.5 nm diameter FePt particles with Ag atoms substituted in lattice. The addition promoted fcc to tetragonal phase transition, thereby reducing temperature required for this transition some 100 150 °C compared pure nanoparticles. After heat treatment at 400 30 min, coercivity films containing was more than 3400 Oe,...
Ferromagnetic resonance (FMR) is one of the most important characteristics soft magnetic materials, which practically sets maximum operation speed these materials. There are two FMR modes in exchange coupled ferromagnet/nonmagnet/ferromagnet sandwich films. The acoustic mode has relatively lower frequency and widely used radio‐frequency/microwave devices, while optical largely neglected due to its tiny permeability even though it supports much higher frequency. Here, a realistic method...
[ FePt ] 1−x Ag x nanoparticles were chemically synthesized. Self-assembled arrays characterized by transmission electron microscopy and small angle x-ray diffraction (XRD). Particles annealed at temperatures from 300 to 500 °C for 30 min degree of chemical ordering was large XRD magnetometry. Compared with pure nanoparticles, additive reduced the A1 L10 temperature more than 100 °C. A maximum coercivity 10 kOe measured samples ∼15% °C, compared about 2 without Ag. This reduction in required...
Partially ordered Fe53Pt47 nanoparticles with size around 8nm were prepared by the simultaneous decomposition of iron pentacarbonyl and platinum acetylacetonate. The high boiling point chemical, hexadecylamine, was used as a solvent, 1-adamantanecarboxylic acid stabilizer. X-ray diffraction measurements reveal that as-made FePt particles partially transformed into L10 phase some weak superlattice peaks. room-temperature hysteresis loop remanence curve suggest broad distribution anisotropies...
We report electric field control of the interfacial Dzyaloshinskii-Moriya interaction (DMI) in MgO/Fe/Pt multilayers. The DMI is obtained and quantified by Brillouin light scattering measurements based on frequency nonreciprocity spin waves a ferromagnet. magnitude induced found to linearly increase as function intensity. efficiency characterized ratio energy change field, which be equal 67 fJ/(Vm) with positive field. further demonstrate that origin enhanced results from MgO/Fe interface....
Abstract Fully electrical manipulation of magnetism, preferably through spin current, is highly desired to achieve energy‐efficient, nonvolatile, and programmable logic devices. It demonstrated in this study that a single Pt/IrMn/Co/Ru/CoPt heterojunction, all 16 Boolean functions can be realized purely way, relying on magnetic‐field‐free spin‐orbit torque (SOT) switching. By applying current pulses along with two orthogonal directions, the exchange bias between IrMn Co, SOT switching...
FePtCu nanoparticles with varying composition were prepared by the simultaneous polyol reduction of platinum acetylacetonate and copper bis(2,2,6,6-tetramethyl-3,5-heptanedionate) thermal decomposition iron pentacarbonyl. As particles had a fcc structure an average diameter 3.5 nm superparamagnetic. Heat treatment self-assembled films at temperatures above 550 °C transformed from to L10 phase, give in-plane coercivities as high 9000 Oe. X-ray diffraction revealed that Cu remained in presence...
[FePt]/sub 1-x/Au/sub x/ nanoparticles were prepared by the simultaneous polyol reduction of platinum acetylacetonate and gold acetate thermal decomposition iron pentacarbonyl, giving 3.5-nm-diameter FePt particles with atoms substituted in lattices. The addition promoted face-centered cubic to tetragonal phase transition, thereby reducing temperature required for this transition more than 150/spl deg/C compared no additives. This effect is even significant adding silver nanoparticles. For a...
Abstract Ferromagnetic resonance (FMR) in soft magnetic films (SMFs) to a large extent determines the maximum working frequency of devices. The FMR ( f r ) an optical mode is usually much higher than that corresponding acoustic for exchange coupled ferromagnet/nonmagnet/ferromagnet (FM/NM/FM) trilayers. In this study, we prepared 50 nm FeCoB film with uniaxial anisotropy (UMA), showing high 4.17 GHz. When ultrathin Ru spacer was inserted very middle UMA-FeCoB film, zero-field abruptly...
The spin reorientation transition in fcc Co/Ni/Cu(001) epitaxial ultrathin films as a function of Co and Ni film thickness is studied by the combination photoelectron emission microscopy x-ray magnetic-circular-dichroism spectroscopy at ${L}_{2,3}$ edge. This microspectroscopic technique allows one to extract local quantitative information about magnetic properties on submicrometer scale. Domain images range 1.4--2.6 atomic monolayers (ML) 11--14 ML show that occurs both thicknesses....
Self-assembled FePt/MnO nanoparticles with different morphology and size were synthesized a polyol process. With the MnO coating, FePt exhibit high blocking temperature magnetic moment. The low-temperature hysteresis loop of can be shifted through AFM pinning shell. aggregation during L10 phase transformation significantly decreased by coating
Analytical and computational models of the easy-axis orientation process in magnetic nanoparticle systems are investigated compared with experimental data. The model gives good agreement experiment on assumption a reduced anisotropy constant, which is ascribed to existence aggregation. It found that degree depends parameter KV∕kT, K constant V volume, governs coupling easy axis moment. A simple useful analytical expression derived, from primary conditions for alignment determined.
Spin Hall angle, which denotes the conversion efficiency between spin and charge current, is a key parameter in pure current phenomenon. The search for materials with large angle indeed important scientific interest potential application spintronics. Here enhanced effect (SHE) of Au-Cu alloy reported by investigating Seebeck effect, anomalous magnetoresistance ${\mathrm{Y}}_{3}\mathrm{F}{\mathrm{e}}_{5}{\mathrm{O}}_{12}$...
Magnetic skyrmions in antiferromagnetic (AFM) coupled systems are gaining attention for their advantages spintronic devices. Their negligible dipolar fields reduce the skyrmion-Hall effect and enable size reduction, making them ideal ultra-high-density information storage. The Dzyaloshinskii-Moriya interaction (DMI) plays a crucial role ensuring stability dynamic properties of chiral spin structures, such as skyrmions, these materials. In this study, trilayer system AFM-coupled Pt/Co/Gd thin...
We report a two-step chemical solution process for synthesis of FePt/Au core/shell nanoparticles. First, FePt nanoparticles were synthesized using typical polyol process. The as-synthesized then used as seed materials and coated with gold shells by reduction the precursors. have been characterized various structural morphological measurements to confirm morphology. found be superparamagnetic became ferromagnetic after annealing at 400 °C. surface modification from hydrophobic hydrophilic was...
Direct evidence of purely interfacial effects on resistance switching is demonstrated in Au/BiFeO<sub>3</sub>/Nd:SrTiO<sub>3</sub>(001) (Au/BFO/NSTO) Schottky junctions by reducing the thickness ferroelectric interlayer BFO.
We investigate the orbital torque generated in ferromagnetic (FM)/manganese (Mn) bilayer systems based on angular-dependent spin-torque resonance (ST-FMR) experiments. From ST-FMR results, it is found that a relatively large out-of-plane anti-damping can be obtained Ni/Mn bilayers. The Gilbert damping constant, derived from resonant linewidth of frequency-dependent experiments, decreases almost linearly with increasing thickness Mn, further indicating systems. origin this attributed to...
Abstract The spin memristive devices combining memristance and tunneling magnetoresistance have promising applications in multibit nonvolatile data storage artificial neuronal computing. However, it is a great challenge for simultaneous realization of large one nanoscale junction, because very hard to find proper spacer layer which not only serves as good insulating but also easily switches between high low resistance states under electrical field. Here we firstly propose use nanon composite...