Improving Hard Magnetic and Magnetocaloric Properties of Nanocrystalline Intermetallics

MRS Advances ◽  
2016 ◽  
Vol 1 (34) ◽  
pp. 2367-2372
Author(s):  
L. Bessais ◽  
R. Guetari ◽  
K. Zehani ◽  
J. Moscovici ◽  
N. Mliki
Keyword(s):  
Magnetic Properties ◽  
Room Temperature ◽  
Low Cost ◽  
Domain Size ◽  
Vacancy Rate ◽  
Magnetocaloric Properties ◽  
Structural And Magnetic Properties ◽  
Iron Based ◽  
Permanent Magnet Materials ◽  
Si Content

ABSTRACTStructural and magnetic properties of nanocrystalline P6/mmm R(Fe,M)9C are presented. Their structure is explained with a model based on the R1–s(Fe,M)5+2s formula (s = vacancy rate) where s R atoms are statistically substituted by s transition metal pairs. The maximum coercivity is obtained for low Ga/Si content for auto-coherent diffraction domain size 30 nm. This controlled microstructure might lead to hard permanent magnet materials. Furthermore, the influence of small amount of Dy substitution on magnetocaloric properties of R-Fe systme is reported. The potential for using these low-cost iron based nanostructured RFe9 powders in magnetic refrigeration at room temperature is also discussed.

Structural and magnetic properties of nitrided finemet-type ribbons

2000 ◽  
Vol 77 (9) ◽  
pp. 731-736
Author(s):  
H Atmani ◽  
S Grognet ◽  
J Teillet ◽  
K Zellama ◽  
R Zuberek
Keyword(s):  
Magnetic Properties ◽  
Curie Temperature ◽  
Crystalline Phase ◽  
Room Temperature ◽  
Structural Parameters ◽  
Thermochemical Treatment ◽  
Specific Magnetization ◽  
Nano Structure ◽  
Magnetostriction Constant ◽  
Structural And Magnetic Properties

Nitriding thermochemical treatment under suitable parameters is used to nano-crystallize Fe73.5Cu1Nb3Si13.5B9 ribbon. This new kind of treatment leads to finer nano-structure and modifies the structural parameters of the α-Fe(Si) phase, obtained during the treatment. The magnetic properties are also improved; specific magnetization at room temperature and Curie temperature of the crystalline phase increase, and the magnetostriction constant becomes smaller. The nitrogenation seems to offer a new way to obtain nanostructured ribbons. PACS No.: 75.70

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.

Structural and magnetic properties of titanate nano-heterostructures decorated with iron based nanoparticles

2020 ◽  
Vol 145 ◽  
pp. 109561
Author(s):  
Suziete B.S. Gusmão ◽  
Anupama Ghosh ◽  
Thalles M.F. Marques ◽  
Gustavo O.M. Gusmão ◽  
Tainara G. Oliveira ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Structural And Magnetic Properties ◽  
Iron Based

Ferromagnetism in N-Doped In2O3 Films Prepared by Thermal Oxidation

2013 ◽  
Vol 763 ◽  
pp. 102-106
Author(s):  
Peng Fei Xing ◽  
Shao Hua Sun
Keyword(s):  
Magnetic Properties ◽  
Thermal Oxidation ◽  
Room Temperature ◽  
Annealing Temperature ◽  
Ferromagnetic Coupling ◽  
Annealing Conditions ◽  
Different Temperatures ◽  
N Doping ◽  
Structural And Magnetic Properties ◽  
Oxygen Atoms

Two series of N-doped In2O3 films were prepared by annealing the sputtered InN films in air at different temperatures and for different time. The corresponding structural and magnetic properties are studied. An apparent transformation from the wurtzite InN to the cubic bixbyite In2O3 is observed with increasing the annealing temperature. Room temperature d0 ferromagnetism is detected, which is found to be closely related with the annealing conditions. We think that the ferromagnetism is derived from the N-doping which substitute the positions of the oxygen atoms in the In2O3 lattice, and an indirect ferromagnetic coupling can be established between the doped N atoms via the hybridized O 2p and In 5p/4d orbitals.

Structural and Magnetic Properties of Nickel Oxide Nanopowders

2010 ◽  
Vol 168-169 ◽  
pp. 341-344 ◽  
Author(s):  
Nina Mironova-Ulmane ◽  
A. Kuzmin ◽  
J. Grabis ◽  
I. Sildos ◽  
V.I. Voronin ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Magnetic Properties ◽  
Neutron Diffraction ◽  
Nickel Oxide ◽  
Room Temperature ◽  
Squid Magnetometry ◽  
X Ray ◽  
Micro Raman Spectroscopy ◽  
Antiferromagnetic Ordering ◽  
Structural And Magnetic Properties

Structure and magnetic properties of nickel oxide (NiO) nanopowders have been studied by X-ray/neutron diffraction, SQUID magnetometer, and micro-Raman spectroscopy. Our diffraction data indicate that at room temperature all NiO powders are antiferromagnetically ordered and have a rhombohedral (R-3m) phase. The SQUID magnetometry and Raman spectroscopy measurements support the presence of the antiferromagnetic ordering.

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