Where are magnetic fields applied in our daily life?
Soft magnetic materials, magnetic materials, magnetic recording materials in magnetic moment both metal material and ferrite material; and the rotating magnetic material and high-frequency soft magnetic materials is ferrite material, because the metal will produce large eddy current effect in high frequency and microwave frequency, resulting in metal magnetic material can not be used, and the resistivity of ferrite is very high, will effectively overcome this problem, widely used. The magnetic material is morphologically. It includes powder material, liquid material, block material, film material and so on.
Magnetic material is widely used in electroacoustic, telecommunication, electric meter, motor, memory element, microwave component and so on. Magnetic tapes for recording language, music, image information, magnetic storage devices for computers, vouchers for passenger travel, magnetic cards for fare settlement, etc.. Magnetic material is widely used in electroacoustic, telecommunication, electric meter, motor, memory element, microwave component and so on. Magnetic tapes for recording language, music, image information, magnetic storage devices for computers, vouchers for passenger travel, magnetic cards for fare settlement, etc.. The following focuses on the magnetic materials used on tape and the principle of action. As we know, hard magnetic materials are magnetized and leave residual magnetism. The strength and direction of residual magnetism depend on the strength and direction of magnetism at magnetization. A tape is composed of tape, binder, and magnetic powder. The base generally uses polycarbonate or vinyl chloride. Magnetic particles are R, Fe2O3 or CrO2 powders with strong residual magnetism. When recording, the current corresponding to the sound change is amplified and sent to the coil of the recording head to produce a concentrated magnetic field in the gap of the head magnet. As the coil current changes, the direction and intensity of the magnetic field changes accordingly. As the tape passes through the gap of the head evenly, the magnetic field passes through the tape and magnetized it. The polarity and intensity of the magnetic tape corresponding to the original sound due to the residual magnetism remaining after leaving the head of the tape. As the tape moves, the sound is constantly recorded on the tape.
Magnetic materials mainly refers to the excessive iron, cobalt, nickel and its alloy can directly or indirectly from the magnetic substance. Magnetic materials from the material and structure, divided into metal and alloy magnetic materials "and" ferrite magnetic materials "two categories, the ferrite magnetic material is divided into multiple the crystal structure and crystal structure of materials. From the application function, the magnetic material is divided into: soft magnetic material, permanent magnetic material, magnetic recording - moment magnetic material, spin magnetic material and so on.
