What are magnetic materials? Classification of magnetic materials
A magnetic material is a material that can respond to a magnetic field in some way is called a magnetic material. According to the strength of the magnetic properties exhibited by a material in an external magnetic field, it can be classified as antimagnetic, paramagnetic, ferromagnetic, antiferromagnetic and subferromagnetic.
Most materials are antimagnetic or paramagnetic, and they react weakly to external magnetic fields. Ferromagnetic and subferromagnetic substances are strong magnetic substances, and the commonly referred to magnetic materials refer to strong magnetic materials.
For magnetic materials, the magnetization curve and hysteresis line are the characteristic curves that reflect their basic magnetic properties.
Ferromagnetic materials are generally Fe, Co, Ni elements and their alloys, rare earth elements and their alloys, and some compounds of Mn.
Magnetic materials are generally classified into soft magnetic materials and hard magnetic materials according to the ease of magnetization.
Usually, magnetic materials refer to strong magnetic substances. Magnetic materials can be divided into soft magnetic materials and hard magnetic materials according to the ease of demagnetization after magnetization. After magnetization, it is easy to remove the magnetic material is called soft magnetic material, not easy to demagnetize the material is called hard magnetic material. Generally speaking, soft magnetic materials have small residual magnetism, and hard magnetic materials have large residual magnetism.
Magnetic materials have magnetically ordered strong magnetic substances, and in a broad sense, also include weak magnetic and antiferromagnetic substances that can be applied to their magnetic properties and magnetic effects. Magnetism is a basic property of matter. Substances can be classified as antimagnetic, paramagnetic, ferromagnetic, antiferromagnetic and subferromagnetic substances according to their internal structure and their properties in the external magnetic field. Ferromagnetic and subferromagnetic substances are strong magnetic substances, while anti-magnetic and paramagnetic substances are weak magnetic substances. Magnetic materials are classified into metal and non-metal by nature, the former mainly include electrical steel, nickel-based alloys and rare earth alloys, and the latter are mainly ferrite materials. According to the use, they are divided into soft magnetic materials, permanent magnetic materials and functional magnetic materials. Functional magnetic materials mainly include magnetostrictive materials, magnetic recording materials, magnetoresistive materials, magnetic bubble materials, magneto-optical materials, spin magnetic materials and magnetic film materials, etc. The basic magnetic properties of magnetic materials are reflected in the magnetization curve, hysteresis line and magnetic loss, etc.
Magnetic materials are an old and young basic functional material with a wide range of applications.