The microstructure and magnetic properties of FeCo alloys with different OH¯/(Co2+, Fe2+) ratio and annealing temperature

2021 ◽  
Author(s):  
Meiyuan Ke ◽  
Tianfa Liao ◽  
Yunjie Jia ◽  
Hongbo Chen ◽  
Fujun Yang
Keyword(s):  
Magnetic Properties ◽  
Annealing Temperature ◽  
Feco Alloys ◽  
Microstructure And Magnetic Properties

Relationship between Microstructure and Magnetic Properties of Nano-Scale Particles Formed in Cu-Ni-(FeCo) Alloys

2018 ◽  
Vol 941 ◽  
pp. 1324-1329 ◽  
Author(s):  
Shintaro Matai ◽  
Hibiki Sakakura ◽  
Mahoto Takeda
Keyword(s):  
Magnetic Properties ◽  
Quantum Interference ◽  
Magnetic Particles ◽  
Superconducting Quantum Interference Device ◽  
Recording Technology ◽  
Treatment Conditions ◽  
Transmission Electron ◽  
Feco Alloys ◽  
The Relationship ◽  
Microstructure And Magnetic Properties

Numerous studies have been conducted to develop next-generation recording technology in spintronics. Because ultrafine magneitc particles are vital components of the technology, the interplay between the microsturcture and magnetic properties has attracted attention extensively in recent years. We focused on the relationship between the microstructure and magnetic properties of Cu-Ni-X (X=Fe, Co, FeCo) alloys comprising nanogranular magnetic particles. In this work, we prepared Cu-20 at% Ni-5 at% (FeCo), Cu-20 at% Ni-5 at% Fe, Cu-20 at% Ni-5 at% Co and examined the changes of microstructure and magnetic properties associated with heat treatments and composition. To examaine microstructural evolution of the alloy specimens, we conducted transmission electron microscope observations (TEM) with the as-quenched specimens and those aged at at 773-1073 K. We also carried out magneto-thermo gravimetry (MTG) measurements, superconducting quantum interference device (SQUID) measurements, magnetoresistance (MR) measurements and first-principles calculations based on the Koster-Korringa-Rostker (KKR) method with the Coherent Potential Approximation (CPA), to investigate the magnetic properties. The present work confirmed that the microstructure significantly changed, depending on the composition and heat treatment conditions. The present work also revealed that the magnetic properties closely correlated with the microstructure of samples.

Microstructure and magnetic properties in percolating (Ni–Fe)x(SiO2)1–x granular films

1996 ◽  
Vol 11 (10) ◽  
pp. 2506-2517 ◽  
Author(s):  
Y. Xu ◽  
X. Yan
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Magnetic Particles ◽  
Annealing Temperature ◽  
Volume Fraction ◽  
Volume Ratio ◽  
Metal Insulator ◽  
Composition Structure ◽  
Enhanced Surface ◽  
Microstructure And Magnetic Properties

We studied composition, structure, microstructure, and magnetic properties of percolating (Ni–Fe)x(SiO2)1−x granular thin films. We found that the magnetic susceptibility increases and the coercivity decreases when increasing x toward xt, the critical metallic volume fraction for the metal-insulator transition, and the susceptibility decreases and the coercivity increases when increasing annealing temperature for x just below xt. Comparison of the microstructure and the magnetic properties suggests that the enhanced magnetic susceptibility for x just below xt is probably associated with the labyrinthine structure of the granular magnetic particles where there is an enhanced surface-to-volume ratio of the magnetic particles.

Effect of Annealing Temperature on the Microstructure and Magnetic Properties of MnGa Films

2016 ◽  
Vol 29 (8) ◽  
pp. 2035-2039
Author(s):  
Weiming Cheng ◽  
Shize Jiang ◽  
Wenchao Xu ◽  
Yajuan Hui ◽  
Haiwei Wang ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Annealing Temperature ◽  
Microstructure And Magnetic Properties

Microstructure and Magnetic Properties of Nd2Fe14B/α-Fe Nanocomposite Prepared by HDDR Combined with Mechanical Milling

2007 ◽  
Vol 534-536 ◽  
pp. 1349-1352 ◽  
Author(s):  
Lian Xi Hu ◽  
Erde Wang ◽  
Bin Guo ◽  
Gang Shi
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Mechanical Milling ◽  
Annealing Temperature ◽  
Nominal Composition ◽  
Annealed Alloy ◽  
Bonded Magnet ◽  
Nanocomposite Powders ◽  
Recombination Kinetics ◽  
Microstructure And Magnetic Properties

Nd2Fe14B/α-Fe nanocomposite powders with a nominal composition of Nd12Fe82B6 were prepared by HDDR combined with mechanical milling. The microstructure of both the as-disproportionated and the subsequently desorption-recombination annealed alloy powders was studied by Mössbauer spectrometry and TEM. The magnetic properties were investigated by VSM using bonded magnet samples. The results showed that the annealing temperature had significant influence on both the recombination kinetics and the grain size of the Nd2Fe14B/α-Fe nanocomposite phases, and the bonded magnet samples presented the best magnetic properties when the nanocomposite powders were prepared by annealing at 760°C for 30 min.

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