Classification of Magnetic Materials

Magnetic materials refer to substances composed of transition elements iron, cobalt, nickel and their alloys that can directly or indirectly generate magnetism. Magnetic materials have different classification standards: according to material and structure, magnetic materials include metals and alloys. Magnetic materials and iron Oxygen magnetic materials are divided into two categories, among which ferrite magnetic materials are further divided into polycrystalline structure and single crystal structure materials. But our commonly used classification is divided according to function, mainly including permanent magnetic materials, soft magnetic materials and functional magnetic materials. Among them, permanent magnetic materials and soft magnetic materials include both metals and ferrites. Functional magnetic materials mainly include magnetostrictive materials, magnetic recording materials, magnetoresistive materials, magnetic bubble materials, magneto-optical materials, and gyromagnetic materials. materials and magnetic film materials.

Classification of Magnetic Materials

Classification of Magnetic Materials

Permanent magnet material

Permanent magnet materials, also known as “hard magnetic materials”, refer to materials that can maintain constant magnetism once magnetized. In practice, permanent magnet materials work in the second quadrant demagnetization part of the deep magnetic saturation and hysteresis loop after magnetization .High carbon steel, AlNiCo alloy, FeCrCo alloy, Samarium Cobalt alloy, etc. are all permanent magnet materials. They can be used to make permanent magnets and provide a constant working magnetic field in a certain space. Using itself or through the magnetic field and The interaction of current-carrying conductors, charged particles and eddy currents can easily exchange one kind of energy for another, so it is widely used in various precision instruments, electroacoustic devices, permanent magnet motors, microwave devices, and nuclear magnetic resonance imaging. instrument, particle accelerator, magnetic coupling rotating device and various magnetic therapy devices.

soft magnetic material

Soft magnetic material refers to when the magnetization occurs at Hc not greater than 1000A/m, such a material is called a soft magnet. A typical soft magnetic material can achieve the maximum magnetization with the smallest external magnetic field. Soft magnetic materials are magnetic materials with low coercivity and high permeability. Soft magnetic materials are easy to magnetize and easy to demagnetize, and are widely used in electrical and electronic equipment. Typical soft magnetic materials include pure iron, silicon steel, nickel-iron alloy, iron-cobalt alloy, manganese-zinc ferrite, etc.

Gyromagnetic material

Gyromagnetic materials exhibit significant gyromagnetic phenomena at microwave frequencies, such as rotating the plane of polarization of electromagnetic waves passing through them (Faraday’s law of geomagnetic induction), or decomposing incident electromagnetic waves into lines with different propagation speeds and perpendicular to each other Polarized waves (law of birefringence) or electromagnetic waves are strongly absorbed by materials (ferromagnetic resonance). Various microwave ferrite devices can be made by using philosophical gyromagnetic phenomena, such as isolators, circulators, phase shifters, mixers, Parametric amplifiers, etc., are widely used in radar technology. Typical materials are spinel ferrite represented by magnesium manganese and lithium ferrite, garnet ferrite represented by yttrium iron garnet, and barium ferrite represented by Ferrite is represented by magnetoplumbite ferrite, etc.

Magnetic information material

Magnetic information materials refer to a large class of magnetic materials used in computers, magnetic recording and other information processing technologies to access information. With the development and popularization of computers and video recorders, the output value of such magnetic information materials has always been the highest among magnetic materials. tallest.

There are three main series of measurement indicators for the performance of magnetic materials:

(1) Stability, the main parameters are residual magnetization, maximum magnetic energy product, the higher the value, the higher the magnetic field strength, the better the magnet can maintain its own magnetic properties;

(2) Anti-demagnetization, the main parameter is the intrinsic coercivity, the larger the value, the stronger the anti-demagnetization ability and the higher the use efficiency;

(3) Temperature resistance, the main parameters are intrinsic coercivity, maximum use temperature and Curie temperature. The higher the value, the better the temperature resistance and the more stable the performance of the magnetic material.

Super Strong Arc Tile Shaped Vibration Motor Magnets

Thickness Magnetized Segment Sintered Rare Earth NdFeB Magnets for Motor Generator

Rare Earth Curved Neodymium Magnets for Vibration Motor

Neodymium Rare Earth Ndfeb Arc Curved Magnets for Starter Motor

PMLSM Permanent Motor Arc Magnets

Zn Coated Servo Motor Magnets N35H

Motor & Generator Switched Reluctance Motor Magnet

N45H NdFeB Arc Segment Hollow-Shaft Encoder Magnet

N42H Strong Neodymium Arc Permanent Magnet for Rotary Encoders