Optimizing the magnetic properties of Fe-based amorphous powder by adjusting atomic structures from vitrification at different temperatures

2019 ◽  
Vol 126 (16) ◽  
pp. 165109
Author(s):  
Song-Yi Kim ◽  
Hye-Ryeong Oh ◽  
Hyeon-Ah Kim ◽  
A-Young Lee ◽  
Hwi-Jun Kim ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Amorphous Powder ◽  
Atomic Structures ◽  
Different Temperatures

scholarly journals Influence of Cu on the Improvement of Magnetic Properties and Structure of L10 FePt Nanoparticles

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1097
Author(s):  
Luran Zhang ◽  
Xinchen Du ◽  
Hongjie Lu ◽  
Dandan Gao ◽  
Huan Liu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Annealing Temperature ◽  
Reduction Method ◽  
Solid Phase ◽  
Average Particle Size ◽  
Fept Nanoparticles ◽  
Average Particle ◽  
Phase Reduction ◽  
Different Temperatures ◽  
One Step

L10 ordered FePt and FePtCu nanoparticles (NPs) with a good dispersion were successfully fabricated by a simple, green, one-step solid-phase reduction method. Fe (acac)3, Pt (acac)2, and CuO as the precursors were dispersed in NaCl and annealed at different temperatures with an H2-containing atmosphere. As the annealing temperature increased, the chemical order parameter (S), average particle size (D), coercivity (Hc), and saturation magnetization (Ms) of FePt and FePtCu NPs increased and the size distribution range of the particles became wider. The ordered degree, D, Hc, and Ms of FePt NPs were greatly improved by adding 5% Cu. The highest S, D, Hc, and Ms were obtained when FePtCu NPs annealed at 750 °C, which were 0.91, 4.87 nm, 12,200 Oe, and 23.38 emu/g, respectively. The structure and magnetic properties of FePt and FePtCu NPs at different annealing temperatures were investigated and the formation mechanism of FePt and FePtCu NPs were discussed in detail.

Exchange Spring Type Magnet Realized in FePt/Fe Multilayers Deposited by Magnetron Sputtering

2005 ◽  
Vol 872 ◽  
Author(s):  
Yousong Gu ◽  
Dayong Zhang ◽  
Xiaoyuan Zhan ◽  
Zhen Ji ◽  
Xiaolan Zhen ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetron Sputtering ◽  
Layer Thickness ◽  
Lattice Constants ◽  
Si Substrates ◽  
Energy Product ◽  
Layer Deposition ◽  
Different Temperatures ◽  
Spring Type ◽  
Type Magnet

AbstractSeries of FePt/Fe multilayers with different layer thicknesses have been deposited on Si substrates by magnetron sputtering and post annealing at different temperatures and durations. The structure, surface morphology, composition, and magnetic properties of the deposited films have been characterized by XRD, SEM, EDX and VSM. It is found that after annealing at temperatures above 500°C, FePt phase undergoes a phase transition from disorder fcc into ordered fct structure, and become a hard magnetic phase. For [FePt/Fe]n multilayer with varying Fe layer thickness, lattice constants and grain sizes change with Fe layer thickness and annealing temperature. The coercivities of [FePt/Fe]n multilayers decrease with Fe layer deposition time, and the energy product (BH)max shows a maximum with Fe layer thickness. Optimization on layer thickness leads a high (BxH)max value of 15.2MGOe for [FePt(8min)/Fe(4min)]8. The effects of quick annealing and Ag underlayer on the structure and magnetic properties were also studied.

Magnetic properties of Exchange-spring DyFe2/YFe2 Superlattices by Monte Carlo Simulations

2012 ◽  
Vol 1471 ◽  
Author(s):  
Pierre-Emmanuel Berche ◽  
Saoussen Djedai ◽  
Etienne Talbot
Keyword(s):  
Monte Carlo ◽  
Magnetic Properties ◽  
Monte Carlo Simulations ◽  
Field Dependence ◽  
Hysteresis Loops ◽  
Atomic Scale ◽  
Exchange Spring ◽  
Scale Modelling ◽  
Different Temperatures

ABSTRACTMonte Carlo simulations are used to perform an atomic scale modelling of the magnetic properties of epitaxial exchange-coupled DyFe2/YFe2 superlattices. These samples, extremely well-researched experimentally, are constituted by a hard ferrimagnet DyFe2 and a soft ferrimagnet YFe2 antiferromagnetically coupled. Depending on the layers and on the temperature, the field dependence of the magnetization depth profile is complex. In this work, we reproduce by Monte Carlo simulations hysteresis loops for the net and compound-specific magnetizations at different temperatures, and assess the quality of the results by a direct comparison to experimental hysteresis loops.

Investigation of influence of micro-structure on magnetic properties of amorphous powder core

Rare Metals ◽  
2006 ◽  
Vol 25 (6) ◽  
pp. 458-461
Author(s):  
F GUO ◽  
S BA ◽  
D LI ◽  
Z LU ◽  
C LU ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Amorphous Powder ◽  
Micro Structure

Magnetic properties of Fe-based amorphous powder cores produced by a hot-pressing method

2000 ◽  
Vol 215-216 ◽  
pp. 284-287 ◽  
Author(s):  
M Yagi ◽  
I Endo ◽  
I Otsuka ◽  
H Yamamoto ◽  
R Okuno ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Hot Pressing ◽  
Amorphous Powder ◽  
Pressing Method

Structure and properties of nanocrystalline nickel prepared by selective leaching at different temperatures

2017 ◽  
Vol 89 (4) ◽  
pp. 545-552
Author(s):  
Alena Michalcová ◽  
Ivo Marek ◽  
Adél Len ◽  
Oleg Heczko ◽  
Jan Drahokoupil ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Water Solution ◽  
Structure And Properties ◽  
Selective Leaching ◽  
Nanocrystalline Nickel ◽  
Micro Particles ◽  
Nickel Particles ◽  
Nanocrystalline Particles ◽  
Different Temperatures

Abstract Nanocrystalline nickel is an interesting material for catalysis, and also, like all nanocrystalline metals, it has potential for structural application. Our aim was to develop a method for preparation of precursor materials for powder metallurgy. Because of this, selective leaching of binary alloy was chosen as it leads to production of nanocrystalline clustered (sub)micro particles. In this work, the preparation of Ni particles by selective leaching of Al matrix from Al-50 wt.% Ni in NaOH water solution is described. It was found that structure and magnetic properties were strongly dependent on leaching temperature, which was proven by characterization of Ni particles leached at −20, 0, 20, 40, 60 and 80°C. The microstructure of as-prepared particles was observed by HRTEM and also by small angle neutron scattering. Magnetic properties were characterized by measuring of saturation magnetization. It was proven that with increased leaching temperature the grain size of prepared nanocrystalline particles increased. Also the value of saturated magnetization follows the same trend. The amount of hydrogen stored in nickel particles is independent on leaching temperature.

Magnetic properties of compressed amorphous powder cores and their application to a fly-back converter

2000 ◽  
Vol 36 (5) ◽  
pp. 3421-3423 ◽  
Author(s):  
I. Endo ◽  
H. Tatsumi ◽  
I. Otsuka ◽  
H. Yamamoto ◽  
A. Shintani ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Amorphous Powder
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