scholarly journals Anisotropy of Magnetic Properties in Textured Materials

1989 ◽  
Vol 11 (2-4) ◽  
pp. 93-105 ◽  
Author(s):  
J. A. Szpunar
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Magnetic Materials ◽  
Hard Magnetic Materials ◽  
Short Survey ◽  
Textured Materials

A short survey is presented of techniques and methods used to correlate the texture with the magnetic anisotropy of various properties of soft and hard magnetic materials. Also, examples of magnetic materials are discussed with emphasis on techniques of processing which optimize the texture.

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 "

scholarly journals Developing a reference material set for the magnetic properties of NdFeB alloy-based hard magnetic materials

2019 ◽  
Vol 15 (1) ◽  
pp. 21-27
Author(s):  
E. A. Volegova ◽  
T. I. Maslova ◽  
V. O. Vas’kovskiy ◽  
A. S. Volegov
Keyword(s):  
Magnetic Properties ◽  
Magnetic Materials ◽  
Permanent Magnets ◽  
Magnetic Loss ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Magnetic Hysteresis Loop ◽  
Magnetic Characteristics ◽  
Hard Magnetic Materials ◽  
Certified Values

Introduction The introduction indicates the need for the use of permanent magnets in various technology fields. The necessity of measuring the limit magnetic hysteresis loop for the correct calculation of magnetic system parameters is considered. The main sources of error when measuring boundary hysteresis loops are given. The practical impossibility of verifying blocks of magnetic measuring systems element-by-element is noted. This paper is devoted to the development of reference materials (RMs) for the magnetic properties of hard magnetic materials based on Nd2Fe14B, a highly anisotropic intermetallic compound.Materials and measuring methods Nd-Fe-B permanent magnets were selected as the material for developing the RMs. RM certified values were established using a CYCLE‑3 apparatus included in the GET 198‑2017 State Primary Measurement Standard for units of magnetic loss power, magnetic induction of constant magnetic field in a range from 0.1 to 2.5 T and magnetic flux in a range from 1·10–5 to 3·10–2 Wb.Results and its discussion Based on the experimentally obtained boundary hysteresis loops, the magnetic characteristics were evaluated, the interval of permitted certified values was set, the measurement result uncertainty of certified values was estimated, the RM validity period was established and the first RM batch was released.Conclusion On the basis of conducted studies, the RM type for magnetic properties of NdFeB alloy-based hard magnetic materials was approved (MS NdFeB set). The developed RM set was registered under the numbers GSO 11059–2018 / GSO 11062–2018 in the State RM Register of the Russian Federation.

scholarly journals Preparation and Magnetic Properties of CoFe2O4 Oriented Fiber Arrays by Electrospinning

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3860
Author(s):  
Chen Cheng ◽  
Jianfeng Dai ◽  
Zengpeng Li ◽  
Wei Feng
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Hysteresis Loop ◽  
Magnetic Materials ◽  
Magnetic Moment ◽  
Easy Axis ◽  
Great Influence ◽  
Hysteresis Loops ◽  
Strong Anisotropy ◽  
Fiber Arrays

The morphology of magnetic materials has a great influence on the properties, which is attributed to the magnetic anisotropy of the materials. Therefore, it is worth studying the fabrication of the aligned fiber and the change of its domain distribution. Nanoparticles and nanofibers were prepared by the hydrothermal and electrospinning methods, respectively. At the same time, the arranged nanofibers were collected by the drum collecting device. After the same annealing at 700 °C, it was found that the diameter of fibers collected by different collecting drums is similar. By studying the hysteresis loops of nanoarrays, it was found that they had strong anisotropy. The easy axis was parallel to the long axis, the Hc and Mr of the easy axis and the hard axis were 1330.5 Oe, 32.39 Am2/kg, and 857.2 Oe, 24.8 Am2/kg, respectively. Due to the anisotropy of the shape and the interaction between the particles, the Hc could not be enhanced. Therefore, the Ms and Hc of the nanoparticles were 80.23 Am2/kg and 979.3 Oe, respectively. The hysteresis loop and the change of magnetic moment during the demagnetization of the CoFe2O4 nanofiber array were simulated via micromagnetic software. The simulated Hc was 1480 Oe, which was similar to the experimental value.

scholarly journals Magnetic Properties of Fe, Co and Ni Based Nanopowders Produced by Chemical-Metallurgy Method

2021 ◽  
Vol 23 (1) ◽  
pp. 3
Author(s):  
Tien Hiep Nguyen ◽  
Y. Konyukhov ◽  
Nguyen Van Minh ◽  
D. Y. Karpenkov ◽  
V. V. Levina ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Materials ◽  
Magnetic Measurements ◽  
Chemical Reduction ◽  
Pure Metal ◽  
Fine Tuning ◽  
Magnetic Characteristics ◽  
Hard Magnetic Materials ◽  
Time Parameters ◽  
Co Precipitation

This research study describes the magnetic properties of Fe, Co and Ni metallic nanopowders (NPs) and their ternary nanocomposites (NCs), which can be used as fillers in radio-wave absorbing composite materials and coatings, as well as for magnetic protection of banknotes and security paper. The nanopowders were prepared by the chemical metallurgy method. The desired properties of Fe, Co and Ni NPs and NCs were achieved by co-precipitation, the addition of surfactants and changes in reduction temperature and time parameters. Magnetic measurements showed that all samples of pure metal NPs are semi-hard magnetic materials. The added surfactants have distinct effects on the dimensional and magnetic characteristics of Fe, Co and Ni NPs. Ni–Co–Fe NCs are also mainly semi-hard magnetic materials. Fine-tuning of their composition and chemical reduction temperatures allows controlling the values of Ms and Hc in large ranges from 49 to 197 A·m2/kg and from 4.7 to 60.6 kA/m, respectively.

Investigation of the magnetic properties of Nd-Fe-B based hard magnetic materials

Physica B+C ◽  
1985 ◽  
Vol 130 (1-3) ◽  
pp. 307-311 ◽  
Author(s):  
R. Grössinger ◽  
G. Hilscher ◽  
H. Kirchmayr ◽  
H. Sassik ◽  
R. Strnat ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Materials ◽  
Hard Magnetic Materials

scholarly journals Simulating the Hysteretic Characteristics of Hard Magnetic Materials Based on Nd2Fe14B and Ce2Fe14B Intermetallics

Crystals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 518 ◽  
Author(s):  
Natalia B. Kolchugina ◽  
Mark V. Zheleznyi ◽  
Aleksandr G. Savchenko ◽  
Vladimir P. Menushenkov ◽  
Gennadii S. Burkhanov ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetic Materials ◽  
Permanent Magnets ◽  
Mixed Valence ◽  
Hysteresis Loops ◽  
Anisotropy Field ◽  
Spin Reorientation ◽  
Cost Ratio ◽  
Hard Magnetic Materials ◽  
Negative Effect

The Ce2Fe14B intermetallic, like Nd2Fe14B, has the tetragonal Nd2Fe14B-type structure (space group P42/mnm), in which Ce ions have a mixed-valence state characterized by the coexistence of trivalent 4f1 and tetravalent 4f0 electron states. Despite the fact that the saturation magnetization, magnetic anisotropy field, and Curie temperature of the Ce2Fe14B intermetallic are substantially lower than those of Nd2Fe14B and Pr2Fe14B, Ce2Fe14B retains the capacity of being able to be used in the manufacturing of rare-earth permanent magnets. Moreover, at low temperatures, the anisotropy field of Се2Fe14B is higher than that of Nd2Fe14B, and Се2Fe14B does not undergo the spin-reorientation transition. In this respect, studies of (Nd, Ce)-Fe-B alloys, which are intended for the improvement of the service characteristics-to-cost ratio, are very relevant. A model and algorithm for calculating the hysteresis loops of uniaxial hard magnetic materials with allowance for the K1 and K2 (K2 > 0 and K1 > 0 and K1 < 0) magnetic anisotropy constants were developed and allowed us to obtain data on their effect on the parameters of hysteresis loops for a wide temperature range (0–300 K). The simulation and analysis of hysteresis loops of the quasi-ternary intermetallics (Nd1−хСех)2Fe14B (х = 0–1) was performed. Results of the simulation indicate that the alloying of the Nd2Fe14B intermetallic with Ce to x = 0.94 (1) does not completely eliminate the negative effect of spin-reorientation phase transition on the residual magnetization of the (Nd1−хCeх)2Fe14B intermetallic and (2) slightly decreases the slope of magnetization reversal curve.

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