At present, there are mainly five kinds of magnetic materials to choose from, which are rubber magnet, ferrite magnet, aluminium-nickel-cobalt magnet, samarium-cobalt magnet and neodymium iron-boron magnet according to the magnetic force from weak to strong. The following briefly describes the characteristics of each material to help you choose the right magnet. The material of rubber magnet is very similar to rubber, which can be folded and curled, and can be cut with scissors. The material color is dark brown. The surface can also be pasted with PVC adhesive paper or coated with glue. Each roll can be up to 75mm wide and 100m long, and the standard thickness is 1.5mm. The square piece can be up to 600mm wide and 30m long, and the standard thickness is 0.5 and 0.75mm. The magnet can be made with glue on both sides for easy use. Crafts, sign boards, display boards, magnetic calendars, business cards, telephone books and other ferrites are widely used magnets, which are cheap, but relatively strong magnetic force compared with rubber magnets. The material itself is hard, brittle, and the surface is dark gray. Disc, ring, square, tile. There are a variety of sizes to choose from, such as handicrafts, suction accessories, toys, motors, loudspeakers and other magnetic materials such as aluminum, nickel and cobalt, which have long been used in the technical field. Can be used at very high temperatures - nearly 500 degrees Celsius. The surface is bright as stainless steel after processing. Circular, cylindrical, square, horseshoe, etc. Instruments, meters and high temperature environment samarium cobalt rare earth magnets, the material is very brittle, but resistant to high temperature, can be used at 300 ℃. Disc, ring, square, tile. There are a variety of sizes to choose from high technology fields and high temperature environment NdFeB high performance rare earth magnets, which are not as brittle as samarium cobalt magnets, but the use temperature is not as high as samarium cobalt magnets. It is also easy to oxidize under normal temperature, so the surface must be electroplated. Disc, ring, square, tile. There are a variety of sizes to choose from. NdFeB magnets are currently high-performance magnets, and are increasingly used in non-technical fields, such as adsorption magnets, toys, jewelry, etc. Among the five materials mentioned above, each magnet is subdivided into different brands. See the specific performance introduction for details.
Magnetic materials mainly include four kinds of iron, cobalt, nickel and manganese, which are mainly used in high-temperature superconducting materials and rare earth luminescent materials.
Platinum, iron, cobalt, nickel and other alloys, iridium manganese, iron platinum, platinum and nickel are also necessary materials for making magnetic functional films, magnetic functional materials, magnetic recording and other industries. Magnetic materials such as iron, cobalt, nickel, manganese and other targets are generally recommended to be thinner, 1-2mm, and not more than 4mm thick, otherwise it is not easy to glow.
Principle: The ferromagnetic target will affect the sputtering of the magnetron target. Because most of the magnetic lines of force pass through the ferromagnetic material, the magnetic field on the target surface will be reduced, and a very high voltage is required to make the target surface ignite and glow. Unless the magnetic field is very strong, the magnetic target must be thinner than the non-magnetic material in order to glow and operate normally
(The typical value of Ni target with permanent magnetic structure is less than 4px, the maximum value of magnetic control target without special design is generally not more than 3mm, and the maximum value of Fe and Co target is not more than 2mm; the target with electromagnetic structure can sputter thicker target material, even up to 6mm thick).
During normal operation, the magnetic field intensity on the surface of the magnetic control target is about 0.025T~0.05T; When the target sputtering etching is about to be perforated, the magnetic field intensity on the target surface is greatly increased, close to or greater than 0.1T.
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