Introduction to Isotropic and Anisotropic Ferrite

Short Description:

A ferrite magnet is a metal oxide magnet, usually made from a mixture of iron oxide and oxidized other metals (such as nickel, zinc, manganese, etc.). They are iron oxide type magnets that are very corrosion resistant and low cost, but generally do not have a strong magnetic field. Ferrite magnets are commonly used in many household appliances, electronic equipment and vehicle transmission components. They are also used to make power tools, motors and speakers.

Isotropic and anisotropic ferrite are two different types of magnetic materials. Isotropic ferrite materials have uniform magnetic properties in all directions, meaning their properties are the same regardless of the direction in which the magnetic field is applied. They are used in applications that require the magnet to have the same magnetic field strength in all directions. Anisotropic ferrite materials, on the other hand, have different magnetic properties in different directions. They have a preferred axis of magnetization and exhibit stronger magnetism along this axis than in other directions. Anisotropic ferrites are commonly used in applications that require strong directional magnetic fields, such as magnetic sensors and antennas. Isotropic and anisotropic ferrites are widely used in a variety of industrial and consumer applications due to their magnetic properties and relatively low cost.

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You can't tell from the appearance. The isotropic when pressing (dry pressing or wet pressing), there is a magnetic field, so that the easy magnetization axis of the magnetic powder is aligned. The anisotropic is about 3 times more than the isotropic one. The isotropic is easier than the anisotropic when making. Therefore, the tooling cost and unit price of the isotropic magnets is cheaper, but the magnetic force is much weaker.

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Ferrite Magnet Grade List

Chinese Standard

Type	Grade	Br		Hcb		Hcj		(BH）max		Tw
Type	Grade	KGs	mT	KOe	KA/m	KOe	KA/m	MGOe	KJ/m³	(℃)
Chinese Standard	Y10T	2.00-2.35	200-235	1.60-2.01	125-160	2.60-3.52 210-280		0.8-1.2	6.50-9.50	≤ 300
	Y20	3.60-3.80	360-380	1.70-2.38	135-190	1.76-2.45	140-195	2.5-2.8	20.00-22.00	≤ 300
	Y25	3.80-3.90	380-390	1.80-2.14	144-170	1.88-2.51	150-200	3.0-3.5	24.00-28.00	≤ 300
	Y30	3.90-4.10	390-410	2.30-2.64	184-210	2.35-2.77	188-220	3.4-3.8	27.60-30.00	≤ 300
	Y30BH	3.90-4.10	390-410	3.00-3.25	240-250	3.20-3.38	256-259	3.4-3.7	27.60-30.00	≤ 300
	Y35	4.10-4.30	410-430	2.60-2.75	208-218	2.60-2.81	210-230	3.8-4.0	30.40-32.00	≤ 300

Physical properties of Ferrite
Parameter	Ferrite Magnets
Curie temperature(℃)	450
Maximum operating temperature(℃)	250
Hv(MPa)	480-580
Density(g/cm³)	4.8-4.9
Relative recoil air permeability(urec)	1.05-1.20
Saturation field strength, kOe(kA/m)	10(800)
Br(%/℃)	-0.2
iHc(%/℃)	0.3
Tensile strength(N/mm)	<100
Transverse breaking strength(N/mm)	300

Application

Ferrite magnet is one of most widely used magnet in the world, it is mainly used in the field of PM motor and loudspeaker, also other filed like permanent magnet hanger, magnetic thrust bearing, broadband magnetic separator, loudspeaker, microwave equipment, magnetic therapy sheets, hearing AIDS and so on.