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How to consider the specifications and types of magnets

When choosing NdFeB magnets, customers should choose the magnet trademark suitable for them according to their working temperature. If the working temperature is higher than the...

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Piezomagnetic material

Piezomagnetic materials refer to ferrite materials that can undergo mechanical elongation or shortening (magnetostriction) in the direction of the magnetic field during magnetization. At present, the most widely used are nickel zinc ferrite Ni-ZnFe2O4, nickel copper ferrite Ni-CuFe2O4, and nickel magnesium ferrite Ni-MgFe2O4, among others.Piezomagnetic materials are mainly used for ultrasonic and underwater acoustic devices that convert electromagnetic and mechanical energy, magnetoacoustic devices, as well as telecommunications devices, underwater televisions, electronic computers, and automatic control devices.Piezomagnetic materials and piezoelectric ceramic materials (such as Barium titanate) have almost the same application field, but they are applied under different conditions due to their different characteristics. It is generally believed that ferrite piezoelectric materials are only suitable for frequencies within the tens of thousands of hertz range, while piezoelectric ceram

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2023-07

Ferromagnetic Sources of Ferrite Materials

As for the source of ferromagnetism of ferrite materials, it is not that the magnetism of ordinary metal magnetic materials is formed by the Exchange interaction of direct electron spin between adjacent magnetic atoms, but that the distance between two magnetic ions is far, and oxygen ions are sandwiched in the middle. In fact, the Exchange interaction between the electron spins that form ferromagnetism is formed due to the existence of oxygen ions. This type of Exchange interaction is called Superexchange in ferromagnetic theory. Because of the super exchange, the magnetic moments of magnetic ions on both sides of oxygen ions are arranged in the opposite direction, which is the reason why many metal oxides have Antiferromagnetism. If the magnetic moments arranged in the opposite direction are not equal and there are residual magnetic moments, then this kind of magnetism is called Ferrimagnetism, or ferrite magnetism. Because there are many relative positions between oxygen ions and ma

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2023-07

Hard magnetic material

Hard magnetic materials are relative to soft magnetic materials. It refers to a type of ferrite material that is not easily demagnetized after magnetization and can retain magnetism for a long time. Therefore, sometimes also known as permanent magnet materials or permanent magnet materialsThe crystal structure of hard magnetic materials is mostly hexagonal magnetic lead stone type. Its typical representative is barium ferrite BaFe12O19 (also known as barium permanent porcelain or barium magnetic porcelain), which is a ferrite hard magnetic material with good performance, low cost, and suitable for industrial production.This material can not only be used as a magnet for recorders, microphones, pickups, telephones, and various instruments in telecommunications devices, but also has been applied in pollution treatment, medical biology, and printing displays.Hard magnetic ferrite material is the second main hard magnetic material after aluminum nickel drill series hard magnetic metal mater

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2023-07

Soft magnetic material

Soft magnetic material refers to a type of ferrite material that is easily magnetized and demagnetized under weak magnetic fields (as shown in Figure 1). The typical representatives of soft magnetic materials are manganese zinc ferrite Mn ZnFe2O4 and nickel zinc ferrite Ni ZnFe2O4.Soft ferrite is a type of ferrite material with a wide range of uses, a large quantity, a large variety, and a high output value among various ferrite materials. Currently, there are dozens of products produced in batches in the world, with an annual output of over tens of thousands of tons.Soft magnetic ferrite is mainly used as various inductance components, such as filter cores, transformer cores, antenna cores, deflection cores, as well as magnetic cores for magnetic tape recording and recording heads, multi-channel communication, and other recording heads.Generally, the crystal structure of soft ferrite is Cubic crystal system spinel type, which is used in the audio frequency to Very high frequency frequ

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2023-07

Magnetic effect

The magnetic effect of the material is of basic research. It provides rich information that is interconnected by the material structure, various interactions within the material, and the various physical properties caused by it. For example, the magnetic light effect can be used to detect the transition of magnetic electrons and its energy levels of magnetic substances; magnetic electrical effects reflect the interaction between transmission electrons and electrons that cause macro magnetic electrons. Magnetic effects have or obtained important applications in technology applications, providing various new devices, new materials and new methods for various needs. For example, magnetic-force effects and magnetic sound effects are used to manufacture electrocomputers and delay lines respectively; magnetic light effects are used to observe the distribution of magnetic intensity, develop magnetic light devices and magnetic light storage devices; The heating and degeneration is an effective

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2023-07

Magnetic ferrite material

The performance of ferrite materials is closely related to the four aspects of raw materials, formulation, molding, and sintering, and is also a key research issue in the principle of ferrite technology. However, there are significant differences in the performance of ferrite materials made under the same formula and process. This is mainly due to differences in the specific quality of each process link, such as ball milling, forming, and sintering. Therefore, how to fully leverage the role of various process links and improve quality is a key issue in improving ferrite materials.Usually, ferrite polycrystalline materials are manufactured using powder metallurgy method, as shown in the specific manufacturing process flow chart 6. In recent years, the large-scale production technology and equipment of ferrite materials have undergone greater development abroad. TDK Company in Japan adopts a completely closed pipeline production method from ingredient to material ferrite, which purifies

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