scholarly journals Exchange-coupling Interaction and Magnetic Properties of BaFe12O19/Ni0.5Zn0.5Fe2O4Nanocomposite Ferrite

2014 ◽  
Vol 24 (3) ◽  
pp. 81-85 ◽  
Author(s):  
Young-Woo Oh
Keyword(s):  
Magnetic Properties ◽  
Exchange Coupling ◽  
Coupling Interaction ◽  
Exchange Coupling Interaction

Effect of Wheel Speeds on the Microstructure and Magnetic Properties of Melt-Spun (Nd0.75,Dy0.25)10.5 Zr2Fe82B5.5 Ribbons

2012 ◽  
Vol 569 ◽  
pp. 23-26 ◽  
Author(s):  
Jie Qiu ◽  
Shan Dong Li ◽  
Mei Mei Liu ◽  
Jian Peng Wu ◽  
Yi Hu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Exchange Coupling ◽  
Wheel Speed ◽  
Coupling Interaction ◽  
Nanocomposite Structure ◽  
Melt Spun ◽  
Exchange Coupling Interaction ◽  
Strong Exchange ◽  
Microstructure And Magnetic Properties

Nanocomposite (Nd,Dy)2Fe14B/α-Fe magnets were prepared by directly solidification (DS). The effect of wheel speed on the magnetic properties, microstructure and exchange coupling interaction has been studied. It was found that a uniform R2Fe14B/α-Fe nanocomposite structure with fine α-Fe grains can be developed at an optimum wheel speed of about 18 m/s. Without any heat treatment, the optimal ribbons (v = 18 m/s) show a strong exchange coupling interaction and good magnetic properties, e.g. iHc=1027 kA/m, mr =0.71, (BH)max=174 kJ/m3.

Preparation and Magnetic Properties of the Core-Nanoshell Composite Materials Doped with Nd

2011 ◽  
Vol 284-286 ◽  
pp. 1956-1960
Author(s):  
Ru Xin Che ◽  
Chun Xia Wang ◽  
Bing Yu
Keyword(s):  
Magnetic Properties ◽  
Composite Materials ◽  
Fly Ash ◽  
Exchange Coupling ◽  
Magnetic Loss ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Coupling Interaction ◽  
The Core ◽  
Exchange Coupling Interaction

The core-nanoshell composite materials doped with Nd were prepared by a solid-state reaction method. The core is magnetic fly-ash hollow cenosphere, and the shell is the nanosized ferrite doped with Nd. The thermal decomposition process of the sample was investigated by TG- DTA. The morphology and composition of the composite materials were investigated by the X-ray diffraction analysis ( XRD ), scanning electron microscope ( SEM ) and energy disperse spectroscopy ( EDS ). The results of vibrating sample magnetometer ( VSM ) analysis indicated that the exchange-coupling interaction happens between ferrite of magnetic fly-ash hollow cenosphere and nanosized ferrite coating. The exchange-coupling interaction enhances magnetic loss of composite materials. The results show that doped with Nd can enhance the coercivity too, so the magnetic properties could be promoted further. The magnetic properties of the core-nanoshell composite material are better than that of single-phase.

scholarly journals Microstructure and Magnetic Properties of Highly Ordered SBA-15 Nanocomposites Modified withFe2O3andCo3O4Nanoparticles

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
P. F. Wang ◽  
H. X. Jin ◽  
M. Chen ◽  
D. F. Jin ◽  
B. Hong ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Exchange Coupling ◽  
Sol Gel ◽  
Coupling Interaction ◽  
A Value ◽  
Hydrothermal Processes ◽  
Exchange Coupling Interaction ◽  
Microstructure And Magnetic Properties

Owing to the unique order mesopores, mesoporous SBA-15 could be used as the carrier of the magnetic nanoparticles. The magnetic nanoparticles in the frame and the mesopores lead to the exchange-coupling interaction or other interactions, which could improve the magnetic properties of SBA-15 nanocomposites. Mesoporous Fe/SBA-15 had been prepared via in situ anchoring Fe2O3into the frame and the micropores of SBA-15 using the sol-gel and hydrothermal processes. Co3O4nanoparticles had been impregnated into the mesopores of Fe/SBA-15 to form mesoporous Fe/SBA-15-Co3O4nanocomposites. XRD, HRTEM, VSM, and N2physisorption isotherms were used to characterize the mesostructure and magnetic properties of the SBA-15 nanocomposites, and all results indicated that the Fe2O3nanoparticles presented into the frame and micropores, while the Co3O4nanoparticles existed inside the mesopores of Fe/SBA-15. Furthermore, the magnetic properties of SBA-15 could be conveniently adjusted by the Fe2O3and Co3O4magnetic nanoparticles. Fe/SBA-15 exhibited ferromagnetic properties, while the impregnation of Co3O4nanoparticles greatly improved the coercivity with a value of 1424.6 Oe, which was much higher than that of Fe/SBA-15.

Exchange-Coupling Interaction in Zero- and One-Dimensional Sm2Co17/FeCo Core–Shell Nanomagnets

2019 ◽  
Vol 11 (29) ◽  
pp. 26222-26227 ◽  
Author(s):  
Jimin Lee ◽  
Jiwon Kim ◽  
Danbi Kim ◽  
Gyutae Lee ◽  
Yeong-Been Oh ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Core Shell ◽  
Coupling Interaction ◽  
One Dimensional ◽  
Exchange Coupling Interaction

Effect of exchange-coupling interaction on anisotropy of grain in nanoscaled magnets

2007 ◽  
Vol 141 (3) ◽  
pp. 156-159 ◽  
Author(s):  
Yan Sun ◽  
Ru-wei Gao ◽  
Guang-bing Han ◽  
Min Liu ◽  
Bai-ping Han
Keyword(s):  
Exchange Coupling ◽  
Coupling Interaction ◽  
Exchange Coupling Interaction

Ab initio calculations of the magnetic properties of TM (Ti, V)-doped zinc-blende ZnO

2018 ◽  
Vol 32 (03) ◽  
pp. 1850025 ◽  
Author(s):  
F. Goumrhar ◽  
L. Bahmad ◽  
O. Mounkachi ◽  
A. Benyoussef
Keyword(s):  
Magnetic Properties ◽  
First Principles ◽  
Exchange Coupling ◽  
Local Density ◽  
Density Approximation ◽  
Potential Approximation ◽  
Half Metallic ◽  
Suitable Material ◽  
Zinc Blende ◽  
Exchange Coupling Interaction

In order to promote suitable material to be used in spintronics devices, this study purposes to evaluate the magnetic properties of the titanium and vanadium-doped zinc-blende ZnO from first-principles. The calculations of these properties are based on the Korringa–Kohn–Rostoker (KKR) method combined with the coherent potential approximation (CPA), using the local density approximation (LDA). We have calculated and discussed the density of states (DOSs) in the energy phase diagrams for different concentration values, of the dopants. We have also investigated the magnetic and half-metallic properties of this doped compound. Additionally, we showed the mechanism of the exchange coupling interaction. Finally, we estimated and studied the Curie temperature for different concentrations.

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