Ceramicmagnet, also called ferrite magnet, is one of the common magnets in our daily life. How much do you know about it? Let’s talk about 4 things you should know about ceramic magnets.
Ceramic magnet is sintered from iron oxides and other ingredients. Generally, it can be divided into three types: permanent magnet, soft magnet, and gyromagnetic ceramic magnet.
The ceramic permanent magnet is the small black magnet we usually see. The main raw materials are iron oxide, barium carbonate, or strontium carbonate. After magnetization, the intensity of the residual magnetic field is very high, and the residual magnetic field can be maintained for a long time.
Soft ceramic magnet is prepared by sintering ferric oxide and one or several other metal oxides (such as nickel oxide, zinc oxide, manganese oxide, magnesium oxide, barium oxide, strontium oxide, etc.). The reason why it is called a soft magnetic field is that when the magnetic field disappears, the residual magnetic field is very small or almost nonexistent. Usually used as a choke coil or the core of intermediate frequency transformer. This is completely different from the permanent ceramic magnet.
Gyromagnetic ceramic magnet is a kind of ferrite material with gyromagnetic properties. Rotary magnetism of magnetic materials refers to the phenomenon that the polarization surface of planar polarized electromagnetic waves rotates around the propagation direction in the course of propagation in a certain direction in the material under the action of two perpendicular DC magnetic fields and electromagnetic wave magnetic fields. Gyromagnetic ceramic magnets have been widely used in microwave communications.
According to the different magnetic properties and applications, ferrites can be divided into five types: soft magnet, permanent magnet, spin magnet, moment magnet, and piezomagnetic.
Soft Magnetic Material
The materials are easy to be magnetized and demagnetized in a weak magnetic field, such as zinc-chromium ferrite and nickel-zinc ferrite. Soft magnetic ferrite is a kind of ferrite material with wide application, variety, large quantity, and high output value. It is mainly used for various inductance components, such as filter core, transformer core, radio core, tape recording, and video head, etc. It is also the key material of magnetic recording elements.
Ferrite Permanent Magnet
A compound with a uniaxial anisotropic hexagonal structure. The main ferrites are barium, strontium, and lead and their composite solid solutions. There are two kinds of magnets: the same magnetic field and the different magnetic fields. Because this kind of ferrite material can retain strong constant remanence properties for a long time after the exterior magnetization field disappears, it can be used to generate a stable magnetic field in the outer space. Its application is very extensive, such as: in various types of meters, generators, telephones, loudspeakers, television, and microwave devices as constant magnets.
Hard Magnetic Material
Ferrite hard magnetic material is difficult to demagnetize after magnetization. It is mainly used for recorders, pickups, loudspeakers, and magnetic cores of various instruments in telecommunication devices.
Ferrite Gyromagnetic Materials
Rotary magnetism of magnetic materials refers to the phenomenon that the polarized plane of electromagnetic waves propagates in a certain direction in the material under the action of two mutually perpendicular stable magnetic fields and electromagnetic wave magnetic fields, but the polarized plane will rotate around the propagation direction continuously.
Although metal and alloy materials also have certain spin magnetism, they can not be used because of their low resistivity and large eddy current loss, and electromagnetic wave cannot penetrate into their interior. Therefore, the application of ferromagnetic materials has become a unique field of the ceramic magnet. Gyromagnetic materials mostly consist of various microwave devices with microwave conduits or transmission lines.
Ferrite Moment Magnetic Material
This refers to ferrite materials with rectangular hysteresis loops. Its characteristic is that when there is a small external magnetic field, it can be magnetized and saturated. After removing the external magnetic field, the magnetism remains the same as when it is saturated. Such as magnesium manganese ferrite, lithium manganese ferrite, and so on. This ferrite material is mainly used in memory cores of various electronic computers.
Ferrite Piezomagnetic Materials
This kind of material refers to the ferrite material which is mechanically elongated or shortened in the direction of the magnetic field when magnetized, such as nickel-zinc ferrite, nickel-copper ferrite, and nickel-chromium ferrite. Piezomagnetic materials are mainly used as transducers for the mutual conversion of electromagnetic energy and mechanical energy, and as magnetostrictive elements for the ultrasound.
Ceramic Magnet Applications
Ceramic magnets are widely used in electroacoustics, telecommunications, watt-hour meter, voice coil motor, a memory element, microwave element and so on. They can be used to record language, music, image information tape, computer magnetic storage equipment, passenger travel vouchers, and magnetic card for fare settlement, etc.
Grade Table of Ceramic Magnets
Thank you for reading our article and we hope it can help you have a better understanding of the ceramic magnets. If you want to know more about the ceramic magnets, you can visit Stanford Magnets for more information.
Stanford Magnets has been involved in R&D, manufacturing, and sales of permanent magnets since the 1990s, providing customers with high-quality rare earth permanent magnetic products such as neodymium magnets, and other non-rare earth permanent magnets.