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This section provides an overview for permalloy as well as their applications and principles. Also, please take a look at the list of 6 permalloy manufacturers and their company rankings. Here are the top-ranked permalloy companies as of December, 2024: 1.MAGNETICS, 2.JIANGSU HONGYUN PRECISION INDUSTRY CO., LTD., 3.Sekonic Metals Technology Co., Ltd..
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1987~1991: Engaged in research on wire covering materials at Polymer Materials Laboratory.
1991~1997: Worked as a patent Engineer at Koike International Patent Office.
1997~2005 Worked as an intellectual property member at GE Yokogawa Medical System, currently working as a writer.
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A Permalloy is a type of nickel-iron alloy, especially one with a nickel content of 35-80%.
The name Permalloy is common, but the official name defined by the Japanese Industrial Standard JIS C 2531 is an iron-nickel soft magnetic material. A Permalloy has a low coercivity and high permeability and has the characteristics of a high magnetic shielding effect and a high magnetic focusing effect.
Another property is that it can exhibit high magnetization when a fine magnetic field is applied, and it also increases the impedance in AC circuits.
Permalloys are used to prevent magnetic leakage from magnetic heads installed in magnetic recording devices such as TVs, PCs, videotapes, and hard disks. The aforementioned properties make permalloys suitable as a magnetic shielding material.
In addition, biomagnetic measurement, a next-generation diagnostic method that has been attracting attention in recent years, requires the measurement of extremely weak magnetic fields and must be shielded from the effects of environmental magnetic fields. Therefore, a magnetically shielded room with permalloy magnetic shielding has been installed to prevent the influence of environmental magnetic fields.
Permalloys are a type of nickel-iron alloy with a nickel content of 35-80%, but raw permalloys do not have a very high magnetic permeability. Permalloys undergo a process called "magnetic annealing" and "strain relief burning."
Magnetic annealing is a heat treatment to remove oxide films, etc., which prevents the movement of magnetic domains where the magnetic moment of the atoms in permalloys are aligned. This removal of impurities allows the external magnetic domains to move.
The removal of these impurities promotes the movement of magnetic walls and rotation of magnetic domains when an external magnetic field is applied, thereby improving soft magnetic properties. The magnetic permeability of permalloys after magnetic annealing is about 100 times higher than that of permalloys before magnetic annealing.
Straining and burning is a process performed at lower temperatures than magnetic annealing to remove residual stress by recrystallization. The purpose is to make it easier to process. It is also possible to achieve even higher magnetic permeability by adding molybdenum, copper, or chromium.
There are several types of permalloys, which are used for different purposes. Two of the most commonly used are Permalloy B (PB) and Permalloy C (PC), where PB is a binary alloy of iron and nickel and PC is a multi-alloy of iron, nickel, molybdenum (Mo) and copper (Cu).
In magnetic materials, the higher the saturation magnetization Bs, which indicates the absolute value of magnetic force, the more suitable the material is for magnetic shielding in strong magnetic fields. On the other hand, the larger the magnetic permeability μ (the larger the maximum permeability near saturation magnetization Bs), the more suitable it is for magnetic shielding in weak magnetic fields because it can respond to changes in weak magnetic fields.
In this case, the maximum permeability of PB and PC are 50,000 and 180,000, respectively, and the saturation magnetization Bs is 1.55T for PB and 1.72T for PC. In other words, PB with large saturation magnetization is suitable for shielding in strong magnetic fields, while PC with large permeability is suitable for shielding in weak magnetic fields.
In addition to its function as a magnetic shield as described above, permalloys also have a function as a core that detects weak magnetic fields increases the magnetic flux for output, and is used as a core for current sensors and transformers. A current sensor is a sensor for measuring electric current. When current flows through a conductor, magnetic flux is induced in the core, and the magnitude of the magnetic field is used to measure the current value.
A transformer is a device for converting voltage and insulating between circuits; it consists of an input coil and an output coil wound independently on a single core, and when current flows in the input coil, voltage is output to the output coil by the nature of electromagnetic induction. The use of Permalloys, which have high magnetic permeability, makes it possible to downsize the transformer.
Permalloys are flexibly deformable and have excellent workability. Like other metals, it can be processed by bending, cutting, pressing, and punching. However, nickel alloys, of which permalloys are a part, are representative of materials that are generally considered difficult to cut. For this reason, cutting permalloys requires a high level of technical skill.
Permalloys are widely used in magnetic shields, measuring instruments, magnetic heads, audio equipment, communication cables, etc., and are processed and used in a variety of shapes, including cylindrical, plate, ring, wire, and foil shapes, depending on the application.
*Including some distributors, etc.
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Founded in 1949, Magnetics® is a leading world supplier of soft magnetic components and materials for the electronics industry. We specialize in research, design and production of high-quality powder cores, ferrite cores, tape wound cores, nanocrystalline cores, and amorphous cores for applications such as chokes, inductors, filters, transformers and power supply components for use in alternative energy, uninterruptible power supplies (UPS), telecommunications, aerospace, military, medical and other electronics systems.
Daido Steel Co., Ltd., originally founded in 1916 in Japan, is a manufacturer of alloy and tool steels. The company offers a wide range of products that include mechanical construction steels, superalloys used in engine components, welding wires, alloy powders, and permalloy foil. Daido Steel Co., Ltd.'s specialty steel products are used in the automotive parts, industrial machinery parts, electrical machinery parts, and welding markets. The company has diversified to include businesses in real estate, insurance, and the provision of welfare services and has expanded operations outside of Japan in North America, Asia, and Europe.
Jiangsu Hongyun Precision Industry Co., Ltd., based in Jiangsu province, China, is a developer and manufacturer of laminations, permalloys, shielding parts, and related magnetic products. The company’s products have good magnetic permeability, low magnetic loss, low coercive force, and thermal characteristics suitable for a range of applications in energy saving devices & miniaturization, electronics, and for power supply in electric power plants and many electronic industries. To meet the needs of their esteem customers, the company maintains long-term relationship and offers other products including cut cores, tape wound cores, and stacking cores in a timely manner to clients.
Xiamen ZTC Technology Co., Ltd (Zentar), established in 1993, is a manufacturer of current transformers, based in Xiamen, China. With over 30 years of expertise, they have over 250 dedicated workers produce more than 2000 customized products for electrical safety and electric measuring needs of their customers. The company has an ISO 9001, ISO 14001, and IATF16949 certified factory. Their processes are not only UL ETL CE CCC certified but also in compliance with RoHS REACH. They manufacture advanced current transformers for EV charging modules, GFCI, RCD, and wireless energy monitors, contributing to safer electrical practices.
Sekonic Metals Technology Co., Ltd., located in Jiangsu province, China, is certified with ISO9001 standards and specializes in the production of anti-corrosion and high temperature alloys for many industrial applications since 1996. The company’s core products include magnetic alloys, monel alloys, precision alloys, titanium alloys, and some others such as coblat and Hastelloy alloys. These products are manufactured and supplied in accordance with the relevant standards to domestic and oversea users in different forms including rod, bar, strip, plate, and other shapes which are used in various fields such as metallurgy, electronics, energy, chemical, aviation & aerospace industries.
Ranking as of December 2024
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | MAGNETICS |
38.7%
|
| 2 | JIANGSU HONGYUN PRECISION INDUSTRY CO., LTD. |
17.9%
|
| 3 | Sekonic Metals Technology Co., Ltd. |
16.1%
|
| 4 | Daido Steel Co., Ltd． |
14.3%
|
| 5 | Xiamen ZTC Technology Co., Ltd |
11.9%
|
| 6 | Koei Co., Ltd. |
1.2%
|
Derivation Method
The ranking is calculated based on the click share within the permalloy page as of December 2024. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
China
|
3 | 50.0% |
|
Japan
|
2 | 33.3% |
|
United States of America
|
1 | 16.7% |
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