scholarly journals Magnetic properties of hexaferrite nanosized powders produced via mechanoactivation

2005 ◽  
Vol 37 (2) ◽  
pp. 107-114 ◽  
Author(s):  
E.P. Naiden ◽  
R.A. Zhuravlyov ◽  
V.I. Itin ◽  
O.G. Terekhova ◽  
M.V. Politov ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Saturation Magnetization ◽  
Size Effects ◽  
Magnetic Phase ◽  
Structural Parameters ◽  
Magnetic Characteristics ◽  
Nanosized Powders ◽  
Similar Materials ◽  
The Relationship

A study of the relationship between structural parameters and principal magnetic characteristics of nanosized powders of hexagonal ferrimagnetics produced via mechanoactivation has been carried out. The models describing the influence of the size effects on temperatures of magnetic phase transformations, saturation magnetization and magnetic anisotropy of similar materials are discussed.

scholarly journals Enhanced Magnetization of Sol-Gel Synthesized Pb-Doped Strontium Hexaferrites Nanocrystallites at Low Temperature

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Shahid M. Ramay ◽  
Shahid Atiq ◽  
Murtaza Saleem ◽  
Asif Mahmood ◽  
Saadat A. Siddiqi ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Low Temperature ◽  
Saturation Magnetization ◽  
Structural Parameters ◽  
Hexagonal Phase ◽  
Magnetic Moments ◽  
Sol Gel ◽  
Magnetic Characteristics ◽  
Energy Product ◽  
Pb Substitution

Effect of Pb doping on the structural and low temperature magnetic properties ofSrPbxFe12-xO19(x=0,0.1,0.2,0.3,and  0.4), synthesized by sol-gel autocombustion technique, has been investigated. The powder samples were sintered at 800°C for 2 h in order to develop the stable hexagonal phase, characteristic of the SrFe12O19structure. The consequences of Pb substitution (at iron sites) on various structural parameters like lattice constants, unit cell volume, crystallite size, and porosity have been discussed. Fourier transform infrared frequency bands were utilized to determine the formation of tetrahedral and octahedral clusters of M-type ferrites. Hexagonal texture of the grains, a characteristic of the hexagonal crystal structure of SrFe12O19, was refined by Pb substitution. The magnetic properties, determined using a vibrating sample magnetometer, revealed that saturation magnetization decreased, while coercivity was increased with the increase of Pb contents. However, the increased squareness ratio and hence the energy product motivate the utilization of these ferrite compositions where hard magnetic characteristics are required. The increased values of saturation magnetization were observed at reduced temperature of 200 K, attributable to the better spin alignments of individual magnetic moments at low temperature.

Mechanochemical Synthesis of Hexagonal Ferrites BaFe12O19

2018 ◽  
Vol 781 ◽  
pp. 119-124 ◽  
Author(s):  
Viktor Zhuravlev ◽  
Anna Nevmyvaka ◽  
Volya Itin ◽  
Dmitry Velikanov
Keyword(s):  
Phase Composition ◽  
Saturation Magnetization ◽  
Mechanochemical Synthesis ◽  
Annealing Temperature ◽  
Structural Parameters ◽  
Anisotropy Field ◽  
Magnetic Characteristics ◽  
Hexagonal Ferrites ◽  
Increasing Temperature ◽  
Synthesized Materials

The phase composition, structural parameters, and basic magnetic characteristics of BaFe12O19 hexaferrites prepared by the mechanochemical synthesis with subsequent annealing at a temperature of 1000°С and 1100°С for 1 h are investigated. The influence of the annealing temperature on the properties of synthesized materials is analyzed. Values of the saturation magnetization and the anisotropy field are determined. It is established that annealing temperature in the interval 1000 - 1100 °C does not significantly affect on the phase composition and the size of nanoparticles. The value of the anisotropy field increases substantially with increasing temperature.

scholarly journals Effect of the electrodeposition potential on the magnetic properties of FeCoNi films

2019 ◽  
Vol 37 (3) ◽  
pp. 389-394
Author(s):  
Setia Budi ◽  
Sukro Muhab ◽  
Agung Purwanto ◽  
Budhy Kurniawan ◽  
Azwar Manaf
Keyword(s):  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Sulfate Solution ◽  
Synthesis Process ◽  
Magnetic Characteristics ◽  
Soft Magnetic ◽  
X Ray ◽  
Ni Content ◽  
The Mean ◽  
Feconi Alloy

AbstractThe effect of electrodeposition potential on the magnetic properties of the FeCoNi films has been reported in this paper. The FeCoNi electrodeposition was carried out from sulfate solution using potentiostatic technique. The obtained FeCoNi films were characterized by X-ray diffractometer (XRD), atomic absorption spectrometer (AAS) and vibrating sample magnetometer (VSM). It has been shown that the electrodeposition potential applied during the synthesis process determines the magnetic characteristics of FeCoNi films. The more negative potential is applied, the higher Ni content is in the FeCoNi alloy. At the same time, Co and Fe showed almost similar trend in which the content decreased with an increase in applied potential. The mean crystallite size of FeCoNi films was ranging from 11 nm to 15 nm. VSM evaluation indicated that the FeCoNi film is a ferromagnetic alloy with magnetic anisotropy. The high saturation magnetization of FeCoNi film was ranging from 86 A·m2/kg to 105 A·m2/kg. The film is a soft magnetic material which was revealed by a very low coercivity value in the range of 1.3 kA/m to 3.7 kA/m. Both the saturation magnetization and coercivity values decreased at a more negative electrodeposition potential.

scholarly journals Магнитные свойства прессованных нанопорошков гексаферрита бария

2019 ◽  
Vol 89 (10) ◽  
pp. 1567
Author(s):  
А.В. Тимофеев ◽  
В.Г. Костишин ◽  
Д.Б. Макеев ◽  
Д.Н. Читанов
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Easy Plane ◽  
Magnetic Characteristics ◽  
Nanosized Powders ◽  
Force Microscopy ◽  
Chemical Coprecipitation ◽  
Plane Type ◽  
Pressing Operation

Magnetic force microscopy and magnetometry were used to study the magnetic characteristics of pressed nanosized powders BaFe12O19. The powders were obtained by chemical coprecipitation. Magnetic anisotropy of the “easy-plane” type, formed after the pressing operation, was found. The nature of the appearance of anisotropy is discussed.

Substrate-Deposition-Teiimperatijre Dependence of Perpendicular Magnetic Anisotropy in (Fe/Pt) Compositionally-Modulated Films

1991 ◽  
Vol 232 ◽  
Author(s):  
S. Iwata ◽  
S. S. P. Parkin ◽  
H. Nuri ◽  
T. Suzuki
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Saturation Magnetization ◽  
Systematic Study ◽  
Deposition Temperature ◽  
Major Part ◽  
Perpendicular Magnetic Anisotropy ◽  
Perpendicular Anisotropy ◽  
Elastic Effect

ABSTRACTA systematic study on magnetic properties of (Fc/Pt) compositionally-modulated films as a function of substrate-deposition-temperature has been carried out. For films with (2.5ÅFe/18ÅPt)×40, the intrinsic perpendicular magnetic anisotropy Ku is found to increase with decreasing temperature for all the sarmples deposited at temperatures from -114 °C to 220°C during deposition. The higher the substrate-deposition-temperature, the larger the Ku values become. This result implies a possible contribution from the magne to-elastic effect to the total anisotropy. However, a major part responsible for the perpendicular anisotropy may be found in other mechanisms. The saturation magnetization is found to exceed the value for pure Fe at temperatures lower than 180K.

Investigation of Possible Uniaxial Anisotropy in Co11Zr2 Magnetic Phase

2020 ◽  
Vol 65 (1-2) ◽  
pp. 11-17
Author(s):  
R. Hirian ◽  
◽  
P. Palade ◽  
‪A. Ciorîță ◽  
S. Macavei ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
High Temperature ◽  
Magnetic Anisotropy ◽  
Magnetic Materials ◽  
Mechanical Milling ◽  
Magnetic Phase ◽  
Uniaxial Anisotropy ◽  
High Temperature Annealing ◽  
Hard Magnetic Materials

"The Co11Zr2 magnetic phase was obtained by a combination of melting, mechanical milling and high temperature annealing. The structure and magnetic properties of the obtained material were investigated. Even though the samples possessed low coercivity, it was shown that they possess uniaxial anisotropy. Keywords: hard magnetic materials, magnetic anisotropy, mechanical milling, high temperature annealing "

Magnetic Properties of Nanostructured Co-Based Alloys Produced by Dynamic Compaction and Plasma Spray Deposition

2012 ◽  
Vol 190 ◽  
pp. 192-195 ◽  
Author(s):  
L. Kuzovnikova ◽  
Elena A. Denisova ◽  
A. Kuzovnikov ◽  
Rauf S. Iskhakov ◽  
A. Lepeshev
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Plasma Spray ◽  
Spray Deposition ◽  
Anisotropy Field ◽  
Dynamic Compaction ◽  
Magnetic Characteristics ◽  
Bloch Constant ◽  
Deposition Techniques ◽  
Ferromagnetic Resonance Linewidth

The bulk nanostructured Co-P alloys were prepared by dynamic compaction and a plasma spray deposition techniques. The magnetic characteristics, such as the saturation magnetization, M0, the Bloch constant, B, the local magnetic anisotropy field, Ha, the ferromagnetic resonance linewidth, ΔH, the coercivity, Hc, were investigated. A comparison between the magnetic properties of the Co-P alloys prepared by dynamic compaction and a plasma spray deposition techniques was carried out.

scholarly journals Tailoring of Magnesium Substitution on Structure and Magnetic Properties of Lithium Ferrites

2021 ◽  
Vol 22 (2) ◽  
pp. 217-223
Author(s):  
Julia Mazurenko
Keyword(s):  
Magnetic Properties ◽  
Solid Phase ◽  
Sol Gel ◽  
Combustion Method ◽  
Magnetic Characteristics ◽  
Phase Synthesis ◽  
Lithium Ferrites ◽  
Auto Combustion ◽  
Similar Materials ◽  
Shift Data

In this study is reported influence of Mg2+ doping on structure and magnetic properties of nano-sized Li0.5Fe2.5-XMgXO4 (0.0, 0.2, 0.4, 0.6, 0.8) synthesized using sol-gel auto-combustion method. The X-ray diffractometric and Mössbauer data analysis of samples confirmed the formation of pure Li0.5Fe2.5-XMgXO4 nanoparticles ranges crystallite size from 15 nm to 35 nm. Iron ions are redistributed on the A and B sites in a ratio of approximately 4:6, and magnesium ions 8:2, respectively. The advantages of the B position of the above ions are as follows: Li+>Fe3+>Mg2+. RT-Mössbauer indicated the presence of 57Fe in both sublattices. Position identification was performed based on the distribution of the over exchange fields and isomeric shift data. Magnetic characteristics were obtained for rings made of synthesized material. They showed a non-monotonic dependence on the composition and found significantly higher rates compared to similar materials obtained by solid-phase synthesis.

scholarly journals Magnetic properties of ferromagnetic steels under different stress by the alternating current magnetization

2019 ◽  
Vol 23 (3 Part A) ◽  
pp. 1465-1471
Author(s):  
Ming Wei ◽  
Zhan-Guo Ma ◽  
Dao-Xiang Teng ◽  
Qing Chen ◽  
Qiang Liu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Alternating Current ◽  
Magnetic Characteristics ◽  
Electromagnetic Measurement System ◽  
The Difference ◽  
Stress States ◽  
Ferromagnetic Steels ◽  
Electromagnetic Measurement ◽  
The Relationship ◽  
Variation Tendency

The alternating current magnetic characteristics of the ferromagnetic materials act a significant factor to reflect their stress states. To reveal the relationship between the stress and the magnetic properties of the ferrimagnetic steels, we deduce the relation of alternating current permeability and the detected voltage of the nine-feet probe by using the basic laws in magnetism and law of electromagnetic reaction, and then we use the nine-feet probe to design and build the electromagnetic measurement system. Next some corresponding experiments were carried out to test the induction voltage of the two kinds Q-steel samples under the different stress. The results were shown that there was a similar variation tendency of the detected voltage in the two kinds the Q-steel samples, the max different values of the detected voltage can be reach 150 mV in the Q215 sample and 280 mV in the Q275 sample, respectively. Therefore, with the help of the difference detected voltage we can check the stress state of the ferrimagnetic steels conveniently in the engineering.

scholarly journals Electronic and magnetic properties of the 2H-NbS2 intercalated by 3d transition metal atoms

2019 ◽  
Vol 74 (1) ◽  
pp. 91-98 ◽  
Author(s):  
Svitlana Polesya ◽  
Sergiy Mankovsky ◽  
Hubert Ebert
Keyword(s):  
Monte Carlo ◽  
Magnetic Properties ◽  
Electronic Structure ◽  
Structural Parameters ◽  
Transition Metal Atoms ◽  
Coupling Parameters ◽  
Relationship Of ◽  
The Relationship ◽  
State Configuration ◽  
Good Agreement

AbstractThe electronic structure and magnetic properties of the compound 2H-NbS2 intercalated by 3d elements from Cr to Ni, have been investigated using the Korringa–Kohn–Rostoker electronic structure method. Here, we consider the phases with 33% of intercalation within the ordered phase having a $\sqrt 3 \times \sqrt 3 $ arrangement of the magnetic atoms. We analyze the relationship of the magnetic and electronic properties on the structural parameters dependent on the intercalant. The exchange coupling parameters calculated from first principles have been used for subsequent Monte Carlo simulations. Within these investigations, the FM order was found for the Cr and Mn intercalated phases as ground state configuration with a Curie temperature being in good agreement with the experiment. According to the Monte Carlo simulation, Fe1/3NbS2 has a complicated noncollinear magnetic structure with a noncompensated total magnetic moment, whereas Co1/3NbS2 and Ni1/3NbS2 are found to be antiferromagnetic, all in line with experimental observations.

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