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How to convert between soft magnetic device and magnetic material parameters and electrical parameters

When designing a soft magnetic alloy device, it is first necessary to determine the voltage-current characteristics of the device according to the requirements of the circuit. The device's voltage-current characteristics are closely related to the core's geometry and magnetization. The designer must be familiar with the magnetization process of the material and grasp the conversion relationship between the magnetic parameters of the material and the electrical parameters of the device. Designing a soft magnetic alloy device usually includes three steps: correct selection of magnetic material; reasonable determination of the magnetic core geometry and size; according to the requirements of the magnetic parameters, simulation of the working state of the magnetic core to obtain the corresponding electrical parameters.
Magnetic material is an important electronic material. Early magnetic materials mainly used metal and alloy systems. With the development of production, in the power industry, telecommunications engineering, and high-frequency radio technologies, it is imperative to provide a high-performance magnetic material with high resistivity. After re-investigating magnetite and other magnetic oxides, a new type of magnetic material, ferrite, was developed. Ferrite is a magnetic material belonging to an oxide system and is a composite oxide mainly composed of iron oxide and other iron group elements or oxides of rare earth elements and can be used for manufacturing various functional devices for energy conversion, transmission, and information storage.
Ferrite magnetic materials can be classified according to their crystal structure: spinel type (MFe2O4); garnet type (R3Fe5O12); magnetoplumbite type (MFe12O19); perovskite type (MFeO3). Among them, M refers to a divalent metal ion having an ion radius similar to that of Fe2+, and R is a rare earth element. According to the different uses of ferrite, it can be divided into soft magnetic alloy, hard magnetic, magnetic moment and magnetic pressure and other types.
The soft magnetic alloy material refers to a ferrite material that is easy to magnetize and demagnetize easily under a weak magnetic field. The soft magnetic alloy ferrites of practical value are mainly manganese-zinc-ferrite Mn-ZnFe2O4 and nickel-zinc-ferrite Ni-ZnFeO4. The crystal structure of the soft magnetic alloy ferrite is generally a cubic crystal spinel type, which is a material widely used in a variety of ferrite, a large number, a variety of varieties, a higher output value. Mainly used as a variety of inductance components, such as filters, transformers and antenna magnetic and tape recording, recording heads.
Hard magnetic material refers to a ferrite material that is not easily demagnetized after magnetization and can retain magnetic properties for a long period of time, and is also referred to as a permanent magnet material or a constant magnetic material. The crystal structure of the hard ferrite is roughly a hexagonal magnetoplumbite type, which is typically represented by the barium ferrite BaFe12O19. This kind of material has good performance and low cost. It not only can be used as a magnet for telecommunication devices such as recorders, telephones and various instruments, but also has been applied in medical, biological and printed displays.
Magnesium manganese ferrite Mg-MnFe3O4, nickel ferrite Ni-CuFe2O4 and rare earth pomegranate ferrite 3Me2O3 • 5Fe2O3 (Me is a trivalent rare earth metal ion, such as Y3+, Sm3+, Gd3+, etc.) is the main ferrite magnet material. The magnetic gyromagnetic material refers to the phenomenon that the polarization plane will continuously rotate around the propagation direction when the electromagnetic wave propagates in a certain direction within the material under the action of two mutually perpendicular DC magnetic fields and electromagnetic wave magnetic fields. The gyromagnetic phenomenon is actually applied in the microwave band. Therefore, the ferromagnetic material is also called microwave ferrite. Mainly used in radar, communications, navigation, telemetry, remote control and other electronic devices.
Important moment magnetic materials are Mn-Zn ferrite and temperature-stable Li-Ni-Zn ferrites, Li-Mn-Zn ferrites. Momentum magnetic materials have the characteristics of distinguishing physical states, such as the "1" and "0" states of an electronic computer, the "on" and "off" states of various switching and control systems, and the "yes" of logic systems. "No" two states and so on. Almost all electronic computers use magneto-magnets to form high-speed memory. Another newly developed magnetic material is a bubble material. This is because some thin films of garnet type magnetic materials will form cylindrical bubble domains when the magnetic field is added to a certain size, which looks like blisters floating on the surface of the water. The "yes" and "nothing" of bubbles can be used to indicate Two states of information "1" and "0". By controlling the generation, disappearance, transmission, splitting and interaction of bubbles between the circuit and the magnetic field, functions such as storage and recording of information and logic operations can be realized. It is important in science and technology such as electronic computers and automatic control. application.
Piezomagnetic materials refer to ferrite materials that can be mechanically elongated or shortened in the direction of the magnetic field when magnetized. At present, nickel-zinc-ferrite, nickel-copper-ferrite and nickel-magnesium-ferrite are the most widely used. Piezomagnetic materials are mainly used for ultrasonic devices that convert electromagnetic energy and mechanical energy to each other, magnetic and acoustic devices, telecommunications devices, electronic computers, and automatic control devices.

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