Every type of permanent magnet has a unique set of characteristics that can affect how is performs in various applications. When evaluating magnet options for your project, pay attention to the following:
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One of the most important parameters to consider when choosing a permanent magnet is the temperature of use. As one might imagine, the magnetic field is not constant; it changes with temperature, getting either stronger or weaker. The figure below shows the usable temperature range for each of the five commercially available materials. Conveniently, most applications utilize magnets between -40°C and 150°C, and all listed materials are usable within that range.
Because of their low cost, ferrite (hard ferrite, ceramic) magnets are still widely used. Note however, that ferrite magnets lose 25% of their flux output when heated from 20 to 150 °C. They also have relatively low energy products, typically 10% of rare earth magnets. So where device size and weight are important, such as hard disk drives and portable electronics (e.g. cell phones, hearing aids), rare earth magnets are necessary.
Issues of raw material price and availability are at the core of today’s discussion on permanent magnets. These factors are influenced by the general availability of the raw materials, geographic distribution, ease of recovery from mined ore, and open market trading. Of all the elements used in magnetic materials, rare earth elements have been the most problematic based on geographic limitations on sourcing. China still produces 90 percent of the rare earth oxides used each year and more than 95 percent of the rare earth metals and alloys. China also produces and consumes 80 percent of all permanent magnets. There is inconsequential production of neodymium-iron-boron (NdFeB) in the US. One alternative to neodymium magnets is samarium cobalt (SmCo), which has fewer sourcing limitations and performs better in higher temperature applications.
How strong a magnet is can be quantified by one of two key metrics. The first is residual induction, BR. If a permanent magnet is placed on a steel block, the force required to remove the magnet from the block is proportional to BR. BR is one of the magnet characteristics published by magnet producers.
The second key metric is maximum energy product, (BH)MAX. Maximum energy product is useful in calculating performance of motors. (BH)MAX is proportional to BR2. Each type of device benefits especially from either B (that is, BR) or B2 (that is,(BH)MAX or BR2) as described in this table of applications.
General Description Physical Laws System Function
Read our in-depth article, Permanent Magnets in a Changing World Market.
In today’s rapidly evolving technological landscape, magnetic innovations form the backbone of countless breakthrough applications—from powering high-efficiency electric motors and advanced sensors to driving the next generation of clean energy systems. Magnets, often unseen yet indispensable, enable everything from the precise control in industrial automation to the seamless performance of electric vehicles and consumer electronics.
This article delves into the world of magnetic technology, spotlighting a select group of industry trailblazers whose cutting-edge products and enduring expertise are redefining the limits of what magnets can achieve. With a blend of time-honored tradition and modern ingenuity, these companies not only lead the market with high-performance materials and integrated systems but also fuel a future where efficiency, safety, and innovation are paramount.
Year Founded:
Headquarters: New York, USA
Company Type: Manufacturer
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Arnold Magnetic Technologies is recognized worldwide as a premier manufacturer of high-performance permanent magnets, flexible composites, electromagnets, magnetic assemblies, and precision thin metal foils.
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Headquarters: Chicago, Illinois, USA
Company Type: Manufacturer
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Dexter Magnetic Technologies stands out as a dynamic provider of integrated magnetic solutions, driven by a team of seasoned engineers and support experts.
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Headquarters: Zhejiang, China
Company Type: Manufacturer
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One of the top permanent magnet manufacturers globally, Ningbo Zhaobao Magnet excels in the research, development, and production of rare earth magnets such as NdFeB and SmCo.
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Headquarters: Illinois, USA
Company Type: Manufacturer
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With a legacy dating back to , Adams Magnetic Products combines experience with innovation to design and manufacture a broad spectrum of magnetic products.
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Headquarters: Tokyo, Japan
Company Type: Manufacturer
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Company Profile：
A leader among magnetic material suppliers, Hitachi Metals Ltd provides an extensive range of magnets, including Neomax rare earth and ferrite magnets, across various sectors.
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Year Founded:
Headquarters: Atlas Way, Sheffield S4 7QQ, United Kingdom
Company Type: Manufacturer
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Company Profile：
With 100 years of industry expertise, Eclipse Magnetics Ltd is synonymous with high-performance magnetic systems designed for the most demanding industrial applications.
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Headquarters: Netherlands
Company Type: Manufacturer
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Goudsmit Magnetics Group is a globally recognized supplier, specializing in the design and manufacture of high-tech magnet assemblies and industrial magnet systems.
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Headquarters: Canada
Company Type: Manufacturer
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A Canadian public company with over 35 years of experience in rare earth and rare earth metals, Magnequench International is a pioneer in manufacturing quenched magnetic powder for bonded NdFeB magnets.
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Headquarters: Indiana, USA
Company Type: Manufacturer
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Since the early s, Thomas & Skinner, Inc. has been a world leader in manufacturing cast and sintered AlNiCo magnets, magnetic assemblies, transformer laminations, and tungsten alloys.
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Year Founded:
Headquarters: Germany
Company Type: Manufacturer
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Vacuumschmelze (VACUUMSCHMELZE) is a trailblazer in magnetic materials and solutions, working closely with customers to develop application-specific innovations.
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These ten companies exemplify the diversity and ingenuity inherent in the magnetic technology sector. Whether it’s through groundbreaking material innovations, centuries-long expertise, or an unwavering commitment to quality and efficiency, each company contributes uniquely to a rapidly evolving industry. As the demand for high-performance magnetic solutions continues to grow across sectors—from renewable energy to automotive and beyond—these industry leaders are poised to shape the future of magnetic applications on a global scale.
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