Iron-Nickel magnets are the main topic in this article. We will mainly discuss the research and development of iron-nickel magnets.
The definition of Iron-Nickel Magnets
Iron-nickel magnets do not require rare earth elements and are composed of 50% iron and 50% nickel. The iron and nickel atoms alternate in arrangement, forming a regular periodic crystal structure. This results in a hard magnet, where the direction of magnetization does not easily change, giving its magnetic properties a performance close to that of rare earth magnets.
Because this material could naturally form only in meteorites that are millions of years old, it has been named “cosmic magnet.”
American Scientists’ Research on Iron-Nickel Magnets
American scientists are seeking inspiration from the formation conditions of iron-nickel magnets. The iron-nickel magnets discovered in meteors do not contain cobalt or rare earth elements, but they have a very ordered structure that takes millions of years of natural processes to form. Researchers in the U.S. have developed a method to produce the magnetic properties of iron-nickel alloys, achieving levels comparable to Alnico but at a pace much faster than the natural process that takes millions of years.
This method introduces a large number of defects into the iron-nickel alloy and then reacts it with ammonia to generate a chemically ordered iron-nickel-nitrogen precursor, known as FeNiN. The next step involves extracting nitrogen from the raw materials without disrupting the remaining order of the iron and nickel.
The ammonia process is scalable and can reliably produce about 98% of the precursor material. The energy density of the final product can compete with that of Alnico magnets, with further room for improvement.
Japanese Scientists’ Research on Iron-Nickel Magnets
Japanese researchers have also studied iron-nickel magnets. Researchers created an iron-nickel semi-metallic alloy by replacing Fe in the Fe-Si-B-P-Cu series of nano-crystalline soft magnetic alloys, NANOMET, with Ni. This alloy was then used to perform heat treatment on amorphous metals, which had their atomic sequences disrupted through liquid rapid freezing. This process resulted in FeNi magnets that do not contain rare earth elements.
The crystallization speed of the amorphous metal is extremely fast, reducing the Fe-Ni formation time in naturally occurring meteorites, which typically takes billions of years, to just 300 hours. Furthermore, since this magnet does not contain other high-cost elements, the raw material cost is relatively low.
Recent Development in Iron-Nickel Magnets
Denso Corporation has developed an iron-nickel superlattice magnet that uses only iron and nickel. This magnet is based on an FeNi ordered alloy with an L10 ordered structure, enhancing its magnetic properties through a superlattice arrangement.
Potential Advantages of Iron-Nickel Magnets
| Performance: Denso’s magnet achieves performance equal to or superior to neodymium magnets. Technical details from a Denso patent indicate a mean order degree of 0.4 or higher and a coercivity of 87.5 kA/m or higher, suggesting a high magnetic strength.
| Cost-Effectiveness: Iron and nickel are abundant and cheaper than rare earth elements, making Iron-Nickel magnets potentially cost-effective. However, the advanced manufacturing process may increase production costs, which could be a factor in commercialization.
Overall, this technology is still some time away from practical application; it currently serves as a new material in the laboratory for scientists to study fundamental physical properties and magnetic characteristics, striving to expand its potential as a practical material.
Magnets Manufacturer
At Tengye, we’re thrilled to be early participants in your new projects. Our passion for magnets extends from material selection and design optimization to providing magnetic solutions. We hope to bring our knowledge and experience to the forefront by actively engaging in your upcoming projects. Work with our magnet experts to get the right magnet solution for your existing and upcoming projects.
Image Source: Advancedsciencenews & Fusnano & Geologyin & Slideshare & Wzmagnetics
