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Hard Ferrite Magnet

Ferrite is a type of ceramic compound composed of iron(III) oxide (Fe2O3) combined chemically with one or more additional metallic elements.They are both electrically nonconductive and ferrimagnetic, meaning they can be magnetized or attracted to a magnet. Ferrites can be divided into two families based on their magnetic coercivity, their resistance to being demagnetized. Hard ferrites have high coercivity, hence they are difficult to demagnetize. They are used to make magnets, for devices such as refrigerator magnets, loudspeakers and small electric motors

Permanent ferrite magnets are made of hard ferrites, which have a high coercivity and high remanence after magnetization. Iron oxide and barium or strontium carbonate are used in manufacturing of hard ferrite magnets. The high coercivity means the materials are very resistant to becoming demagnetized, an essential characteristic for a permanent magnet. They also have high magnetic permeability. These so-called ceramic magnets are cheap, and are widely used in household products such as refrigerator magnets. The maximum magnetic field B is about 0.35 tesla and the magnetic field strength H is about 30 to 160 kiloampere turns per meter (400 to 2000 oersteds).[8] The density of ferrite magnets is about 5 g/cm3

Hard Ferrite Magnet Magnetic Properties

Type Remanence

BR

Normal Coercivity

HcB

Instrinsic Coercivity

HcJ

Br (BH)max
  mT KG KA/m KOe KA/m KOe KJ/m3 MGOe
Y8T 200-235 2.0-2.35 125-160 1.57-2.01 210-280 2.64-3.52 6.5-9.5 0.8-1.2
Y20 320-380 3.2-3.8 135-190 1.70-2.38 140-195 1.76-2.45 18.0-22.0 2.3-2.8
Y22H 310-360 3.1-3.6 220-250 2.77-3.14 280-320 3.52-4.02 20.0-24.0 2.5-3.0
Y23 320-370 3.2-3.7 170-190 2.14-2.38 190-230 2.39-2.89 20.0-25.5 2.5-3.2
Y25 360-400 3.6-4.0 135-170 1.70-2.14 140-200 1.76-2.51 22.5-28.0 2.8-3.5
Y26H 260-390 3.6-3.9 220-250 2.77-3.14 225-255 2.83-3.21 23.0-28.0 2.9-3.5
Y27H 370-400 3.7-4.0 205-250 2.58-3.14 210-255 2.64-3.21 25.0-29.0 3.1-3.7
Y28 370-400 3.7-4.0 175-210 2.20-2.64 180-220 2.26-2.77 26.0-30.0 3.3-3.8
Y30H-1 380-400 3.8-4.0 230-275 2.89-3.46 235-290 2.95-3.65 27.0-32.5 3.4-4.1
Y30H-2 395-415 3.95-4.15 275-300 3.46-3.77 310-335 3.90-4.21 28.5-32.0 3.5-4.0
Y32 400-420 4.0-4.2 160-190 2.01-2.38 165-195 2.07-2.45 30.0-33.5 3.8-4.2
Y33 410-430 4.1-4.3 220-250 2.77-3.14 225-255 2.83-3.21 31.5-35.0 4.0-4.4