The Experts below are selected from a list of 198 Experts worldwide ranked by ideXlab platform
Richard D James - One of the best experts on this subject based on the ideXlab platform.
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materials science Magnetic Alloys break the rules
ChemInform, 2015Co-Authors: Richard D JamesAbstract:Review: a concept of autarky-independent action of Magnetic domains is proposed to explain the unexpected behavior of Alloys that undergo changes of shape upon magnetization; 7 refs.
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materials science Magnetic Alloys break the rules
Nature, 2015Co-Authors: Richard D JamesAbstract:A family of Alloys has been discovered that undergoes unexpected changes of shape when magnetized. This strange behaviour might help in unravelling the mystery of a phenomenon called Magnetic hysteresis. See Letter p.340
Akihiro Makino - One of the best experts on this subject based on the ideXlab platform.
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competition driven nanocrystallization in high bs and low coreloss fe si b p cu soft Magnetic Alloys
Scripta Materialia, 2015Co-Authors: Parmanand Sharma, Akihiro Makino, Xin Zhang, Yan ZhangAbstract:Based on experimental results and Johnson–Mehl–Avrami analysis, we have identified the nanocrystallization mechanism of newly developed Fe-rich Fe–Si–B–P–Cu soft Magnetic Alloys. Competition for growth among a large number of nuclei that are present in as-quenched state (grain density ∼3 × 1021 m−3) and nucleated after annealing above the critical temperature for new nucleation (grain density ∼8 × 1022 m−3) governs the grain size. A model of nanocrystallization is made to predict the Magnetic/structural properties.
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effect of p on crystallization behavior and soft Magnetic properties of fe83 3si4cu0 7b12 xpx nanocrystalline soft Magnetic Alloys
Thin Solid Films, 2011Co-Authors: A D Wang, Akihiro Makino, Baolong Shen, Akihisa InoueAbstract:Abstract The P content dependences of the crystallization behavior, thermal stability and soft-Magnetic properties of high Fe content Fe83.3Si4Cu0.7B12 − xPx (x = 0 to 8) nanocrystalline soft-Magnetic Alloys were investigated. P addition is very effective in widening the optimum annealing temperature range and refining of bcc-Fe grain size in addition to the increasing of nanocrystalline grain density. Uniform nanocrystalline bcc-Fe grains with average size of about 20 nm and number density of 1023–1024 /m3 were prepared at around x = 6–8 for the annealed Fe83.3Si4Cu0.7B12 − xPx Alloys. The coercivity Hc markedly decreases with increasing x and exhibits a minimum at around x = 6–8, while the saturation Magnetic flux density Bs shows a slight decrease. Fe83.3Si4Cu0.7B6P6 nanocrystalline alloy exhibits excellent soft-Magnetic properties with a high saturation Magnetic flux density Bs of 1.77 T, low coercivity Hc of 4.2 A/m and high effective permeability μe of 11,600 at 1 kHz.
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fesibpcu nanocrystalline soft Magnetic Alloys with high bs of 1 9 tesla produced by crystallizing hetero amorphous phase
Materials Transactions, 2009Co-Authors: Akihiro Makino, Takeshi Kubota, Kunio Yubuta, Akihisa InoueAbstract:Technically important nanocrystalline soft Magnetic Alloys and their derivatives always include metal elements such as Nb, Zr, Mo, etc. and/or Cu to realize the nanostructure, which results in a remarkable decrease of saturation Magnetic flux density (B s ) and a significant increase in material cost. With the aim to solve the serious problem, we successfully developed new FeSiBPCu nanocrystalline soft Magnetic Alloys. The melt-spun Fe 83.3-84.3 Si 4 B 8 P 3-4 Cu 0.7 (at%) Alloys have heterogeneous amorphous structures including a large amount of α-Fe clusters, 2-3 nm in size, due to the unusual effect of the simultaneous addition of the proper amounts of P and Cu. The hetero-amorphous Alloys exhibit higher B s of about 1.67T than the representative amorphous and the nanocrystalline Alloys, and the low coercivity (H c ) of 5-10Am -1 . A homogeneous nanocrystalline structure composed of small α-Fe grains with a size of about 10 nm can be realized by crystallizing the hetero-amorphous Alloys. The nanocrystalline Alloys show extremely high B s of 1.88-1.94 T almost comparable to the commercial Fe-3.5 mass%Si crystalline soft Magnetic Alloys, and low H c of 7-10Am -1 due to the simultaneous realization of the homogeneous nanocrystalline structure and small magnetostriction of 2-3 × 10 -6 . In addition, the Alloys have a large economical advantage of lower material cost and better productivity than the ordinary soft Magnetic nanocrystalline Alloys now in practical use.
Giselher Herzer - One of the best experts on this subject based on the ideXlab platform.
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Magnetic field induced anisotropies and exchange softening in fe rich nanocrystalline soft Magnetic Alloys
Scripta Materialia, 2012Co-Authors: K Suzuki, Giselher HerzerAbstract:Abstract Realization of a high-saturation magnetization comparable to that of Fe–Si steel in advanced Fe-rich nanocrystalline soft Magnetic Alloys is potentially a very effective approach to reducing the emission of greenhouse gasses. This potential has stimulated recent research on the development of new Alloys with exceptionally high Fe concentrations. However, some nanocrystalline soft Magnetic Alloys at the Fe-richest compositions exhibit unexpectedly large values of field-induced Magnetic anisotropy ( K u ∼ 100 J m −3 ) which have a detrimental effect on the exchange-softening process in the nanostructures. Our viewpoint is that much attention must be paid to the induced anisotropies in order to utilize the full potential of the exchange-softening effect in Fe-rich nanocrystalline Alloys. Possible origins of the large K u value and the approach to suppressing the field-induced effect on K u are discussed.
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chapter 3 nanocrystalline soft Magnetic Alloys
Handbook of Magnetic Materials, 1997Co-Authors: Giselher HerzerAbstract:Abstract Nanocrystalline structures offer a new opportunity for tailoring soft Magnetic materials. This chapter surveys the state of the art and the key factors from which the extraordinary properties of this new class of soft ferromagnets derive. The materials to be discussed are produced by crystallization from the amorphous state and are based on iron. The alloy system in particular highlighted will be the originally proposed Fe-Cu-Nb-Si-B Alloys which owing to their outstanding properties have meanwhile successfully entered into application. The general features shown up, however, also apply to other nanocrystalline Magnetic materials.
H Shokrollahi - One of the best experts on this subject based on the ideXlab platform.
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the Magnetic and structural properties of the most important Alloys of iron produced by mechanical alloying
Materials & Design, 2009Co-Authors: H ShokrollahiAbstract:Abstract Magnetic Alloys are the key to the future of the power electronics industry. The recent development of transformers, chokes, inductors, filters and the emergence of completely new technologies call for entirely new types of Magnetic Alloys prepared by mechanical alloying (MA) methods. These Magnetic materials appeal to the properties and operating requirements of these applications because of their high magnetization and low coercivity. With expanded application of these materials expected in the future, it is appropriate to review the Magnetic properties of some of the most important Magnetic iron-based Alloys (Fe–Ni, Fe–Si, Fe–Co, Fe–Si–Ni and Fe–Si–B) prepared by MA method.
Ryusuke Hasegawa - One of the best experts on this subject based on the ideXlab platform.
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Applications of amorphous Magnetic Alloys
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2004Co-Authors: Ryusuke HasegawaAbstract:Examples of several recent developments in the use of amorphous Magnetic Alloys are summarized. They include from such devices as utility transformers for energy conservation, charged particle accelerators for energy generation, sensors to monitor energy flow and the environment, and telecommunication devices. Specific properties of the amorphous materials that lead to these applications are pointed out.
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Applications of amorphous Magnetic Alloys in electronic devices
Journal of Non-crystalline Solids, 2001Co-Authors: Ryusuke HasegawaAbstract:Abstract Some of the features of amorphous Magnetic Alloys that differentiate them from other soft Magnetic materials include: low Magnetic loss, fast flux reversal, high electrical resistivity and low acoustic loss. Furthermore, a wide range of B–H characteristics can be obtained through alloy design and heat-treatment of the Alloys under different conditions. The versatile properties thus obtained can then be utilized in a number of Magnetic applications ranging from large electrical power devices such as transformers and motors to recording heads and to anti-pilferage markers. This paper reviews the applications of various amorphous Magnetic Alloys in electronic devices including Magnetic components in power electronics, telecommunication equipment, automotive parts and sensing devices. Relationships between property requirements and material capabilities are also discussed.
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present status of amorphous soft Magnetic Alloys
Journal of Magnetism and Magnetic Materials, 2000Co-Authors: Ryusuke HasegawaAbstract:Application of amorphous soft magnets in electric-utility and industrial transformers are increasingly being adopted, helping to solve global warming and energy-saving problems. In addition, amorphous metal-based Magnetic components are used in power electronics, telecommunication equipment, sensing devices, electronic article surveillance systems, etc. Some Magnetic inductors find applications in pulse power devices, automotive ignition coils, and electric power conditioning systems. All of these applications are possible because of faster flux reversal, lower Magnetic loss and more versatile property modification achievable in amorphous Alloys. Improvements in materials processing and device fabrication technology will continue to take place, which will further increase the universe of application of amorphous soft magnets. Some fundamental problems associated with the applications are mentioned.
