High-temperature-resistant magnetic materials, also known as magnet steel, are mainly divided into two categories: soft magnets and permanent magnets. Permanent magnets include silicon steel sheets and soft high-temperature magnetic cores; hard magnets include aluminum-nickel-cobalt, neodymium-iron-boron, ferrite, and neodymium-iron-boron. Among them, neodymium-iron-boron magnet steel is the most expensive, ferrite magnet steel is the cheapest, neodymium-iron-boron magnet steel has the highest performance, and aluminum-nickel-cobalt magnet steel has better temperature coefficient stability. Users can choose different hard magnet products based on different requirements.

How to define the high-temperature magnetic performance of a strong magnet? It is primarily determined by the following three performance parameters:

Remanence Br: The magnetic induction intensity retained after the permanent magnet is magnetized to technical saturation and the external magnetic field is removed is referred to as the residual induction Br.

Magnetic Retentivity Hc: The reverse magnetic field strength required to reduce the B value of a magnetized permanent magnet to zero, known as the magnetic coercivity, is abbreviated as the coercivity.

Magnetic Energy Product BH: Represents the magnetic energy density established in the air gap space (the space between the two poles of a high-temperature magnet), which is the static magnetic energy per unit volume of the air gap. Since this energy is equal to the product of Bm and Hm of the high-temperature magnet, it is termed the magnetic energy product.