Evidence of anomalous conventional and spontaneous exchange bias, high coercivity in Fe doped NiCr2O4 spinel

2020 ◽  
Vol 49 (14) ◽  
pp. 4502-4517 ◽  
Author(s):  
G. C. Pandey ◽  
K. Nemkovski ◽  
Y. Su ◽  
Chandana Rath
Keyword(s):  
Magnetic Properties ◽  
Exchange Bias ◽  
High Coercivity ◽  
Precipitation Technique ◽  
Polycrystalline Ceramics ◽  
Structural And Magnetic Properties ◽  
Co Precipitation

NiCr2−xFexO4 (x = 0 and 0.2) polycrystalline ceramics have been synthesized successfully through a simple co-precipitation technique to study the evolution of structural and magnetic properties by doping Fe.

scholarly journals Structural and Magnetic Properties Study of Fe2O3/NiO/Ni2FeO4 Nanocomposites

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 613
Author(s):  
Zakia Alhashem ◽  
Chawki Awada ◽  
Faheem Ahmed ◽  
Ashraf H. Farha
Keyword(s):  
Magnetic Properties ◽  
Exchange Bias ◽  
Bias Field ◽  
Zero Field ◽  
Profile Fitting ◽  
Structural And Magnetic Properties ◽  
Xrd Patterns ◽  
Experimental Values ◽  
Co Precipitation ◽  
Mechanical Ball Milling

In the current work, the nanocomposites that consist chiefly of three components—α-Fe2O3, NiO and Ni2FeO4, in two different ratios 2:2:1 (FNN-221) and 2:1:1 (FNN-211), respectively—were produced. The synthesis was done in two steps by following the chemical co-precipitation and mechanical ball-milling route. The presence of individual phase was identified from the XRD data without the detection of any additional impurities. The phase fraction of each component estimated from the profile fitting of XRD patterns were found to be 41.2%, 39.7%, 19.1% in FNN-221 sample and 49.5%, 26.4%, 24.1% for FNN-211 sample, respectively, which were consistent with the experimental values. The total magnetization at 300 K was obtained to be 13.41 emu/g and 10.95 emu/g for FNN-221 and FNN-211 samples, respectively. In FNN-211 compound the zero field coercivity (HC) expanded towards the higher field values thereby signifying the exchange bias behavior. Furthermore, the exchange bias field (Hex) for FNN-211 was obtained as 35.1 Oe.

scholarly journals Magnetic Properties of FePt Nanoparticles Prepared by Sonoelectrodeposition

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
Nguyen Hoang Nam ◽  
Nguyen Thi Thanh Van ◽  
Nguyen Dang Phu ◽  
Tran Thi Hong ◽  
Nguyen Hoang Hai ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Metallic Nanoparticles ◽  
Room Temperature ◽  
Cathode Surface ◽  
High Coercivity ◽  
Fept Nanoparticles ◽  
Promising Technique ◽  
Structural And Magnetic Properties

Sonoelectrodeposition is a useful technique to make metallic nanoparticles, using ultrasound during electrodeposition to remove nanoparticles as they grow on the cathode surface. This paper reports some structural and magnetic properties of FePt nanoparticles prepared by this method. The as-prepared Fe45Pt55nanoparticles were ferromagnetic at room temperature. Upon annealing at 700°C for 1 h under H2atmosphere, the saturation magnetization and the coercivity of the nanoparticles were improved significantly. The annealed nanoparticles showed a high coercivity of 13.5 kOe at 2 K and of 9 kOe at room temperature. Sonoelectrodeposition is a promising technique to make large quantity of FePt nanoparticles.

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