Device for determining static magnetic characteristics of specimens of hard-magnetic materials

1971 ◽  
Vol 14 (11) ◽  
pp. 1726-1728 ◽  
Author(s):  
M. A. Artemova ◽  
O. Yu. Bagalei ◽  
M. I. Grobovitskii ◽  
V. I. Zingerman
Keyword(s):  
Magnetic Materials ◽  
Magnetic Characteristics ◽  
Hard Magnetic Materials

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 The measurement of magnetic saturation intensities at different temperatures

1939 ◽  
Vol 170 (943) ◽  
pp. 551-560 ◽  
Keyword(s):  
Magnetic Materials ◽  
Systematic Investigation ◽  
Magnetic Characteristics ◽  
Hard Magnetic Materials ◽  
Fundamental Properties ◽  
Starting Point ◽  
Different Temperatures ◽  
The Moment ◽  
High Degree ◽  
The Magnetic Field

The magnetic properties of alloy systems have assumed increasing importance in recent years. In view of the extreme complexity of the different magnetic characteristics of these alloys, it is evident that a consideration of the more fundamental properties constitute the essential starting point for a systematic investigation. Whilst the behaviour in low magnetic fields may depend largely upon thermal and mechanical treatment, the intensity is known to show less variation, particularly if sufficiently high fields are employed. In the case of many so-called “hard” magnetic materials, however, some thousands of gauss are necessary to produce complete alinement of the elementary domains. If, further, only small quantities are available, the magnetic field required to overcome the shape factor and saturate the material makes the use of an electromagnet essential. The intensity must be measured over a range of temperatures up to the Curie point, so that the variation in the moment of the elementary magnets accompanying a change in structure can be followed. None of the existing methods appears suitable for rapid measurements on a large number of magnetic materials. A new method has been developed capable of measurements on a few cubic millimetres of substance to a high degree of accuracy at any temperature, and it seemed worth while to deal with it in a separate communication.

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.

Microwires coated by glass: A new family of soft and hard magnetic materials

2000 ◽  
Vol 15 (10) ◽  
pp. 2107-2113 ◽  
Author(s):  
A. Zhukov ◽  
J. González ◽  
J. M. Blanco ◽  
M. Vázquez ◽  
V. Larin
Keyword(s):  
Heat Treatment ◽  
Magnetic Materials ◽  
Nanocrystalline Structure ◽  
Initial Permeability ◽  
Magnetic Characteristics ◽  
Hard Magnetic Materials ◽  
New Family ◽  
Magnetic Softness ◽  
Metallic Wires ◽  
Amorphous Microwires

The Taylor–Ulitovski technique was employed for fabrication of tiny ferromagnetic amorphous and nanocrystalline metallic wires covered by an insulating glass coating with magnetic properties of great technological interest. A single and large Barkhausen jump was observed for microwires with positive magnetostriction. Negative magnetostriction microwires exhibited almost unhysteretic behavior with an easy axis transverse to the wire axis. Enhanced magnetic softness (initial permeability, μι, up to 14000) and giant magneto impedance (GMI) effect (up to 140% at 10 MHz) was observed in amorphous CoMnSiB microwires with nearly zero magnetostriction after adequate heat treatment. Large sensitivity of GMI and magnetic characteristics on external tensile stresses was observed. Upon heat treatment, FeSiBCuNb amorphous microwires devitrificated into a nanocrystalline structure with enhanced magnetic softness. The magnetic bistability was observed even after the second crystallization process (increase of switching field by more than 2 orders of magnitude up to 5.5 kA/m). Hard magnetic materials were obtained as a result of decomposition of metastable phases in Co–Ni–Cu and Fe–Ni–Cu microwires fabricated by Taylor–Ulitovski technique when the coercivity increased up to 60 kA/m. A magnetic sensor based on the magnetic bistability was designed.

Nucleation fields and grain boundaries in hard magnetic materials

1993 ◽  
Vol 29 (6) ◽  
pp. 2878-2880 ◽  
Author(s):  
T. Schrefl ◽  
H.F. Schmidts ◽  
J. Fidler ◽  
H. Kronmuller
Keyword(s):  
Grain Boundaries ◽  
Magnetic Materials ◽  
Hard Magnetic Materials

scholarly journals Nanocrystalline Hard Magnetic Materials

2017 ◽  
pp. 010-018 ◽  
Author(s):  
M.I. Alymov ◽  
◽  
I.M. Milyaev ◽  
V.S. Yusupov ◽  
A.I. Milyaev ◽  
...  
Keyword(s):  
Magnetic Materials ◽  
Hard Magnetic Materials

‘Exchange spring’ behavior in nanocomposite hard magnetic materials

1996 ◽  
Vol 152 (3) ◽  
pp. 353-358 ◽  
Author(s):  
I. Panagiotopoulos ◽  
L. Withanawasam ◽  
G.C. Hadjipanayis
Keyword(s):  
Magnetic Materials ◽  
Hard Magnetic Materials ◽  
Exchange Spring
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