Why are iron compounds not attracted by magnets?
Magnetic material is divided into two kinds of metal and nonmetal according to its properties. The former mainly include electrical steel, nickel base alloy and rare earth alloy, etc. the latter is mainly ferrite material. It is divided into soft magnetic material, permanent magnetic material and functional magnetic material according to its use. Functional magnetic materials are mainly magnetostrictive materials, magnetic recording materials, magnetic materials, magnetic materials, magnetic materials, magnetic materials and magnetic rotary thin film materials, the basic magnetic properties of magnetic materials have reaction magnetization curves, hysteresis loop and magnetic loss etc..
Matter can be divided into diamagnetic, paramagnetic, ferromagnetic, antiferromagnetic and ferrimagnetic substances in terms of their internal structure and their properties in an external magnetic field. Ferromagnetism and ferrimagnetic substances are ferromagnetic substances, diamagnetic and paramagnetic substances are weak magnetic substances.
A ferromagnetic substance having a magnetic order; a generalized magnetic and antiferromagnetic substance that can be applied to its magnetic and magnetic effects. Magnetism is one of the basic properties of matter.
