Permanent Ferrite Magnet/ Speaker Magnet
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Permanent Ferrite Magnet/ Speaker Magnet

A Ferrite Magnet is a ceramic material made by mixing and firing large proportions of iron(III) oxide (Fe2O3, rust) blended with small proportions of one or more additional metallic elements, such as strontium, barium, manganese, nickel, and zinc.

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Ferrite (ceramic) Magnet

A ferrite is a ceramic material made by mixing and firing large proportions of iron(III) oxide (Fe2O3, rust) blended with small proportions of one or more additional metallic elements, such as strontium, barium, manganese, nickel, and zinc. They are ferrimagnetic, meaning they can be magnetized or attracted to a magnet. Unlike other ferromagnetic materials, most ferrites are not electrically conductive, making them useful in applications like magnetic cores for transformers to suppress eddy currents. Ferrites can be divided into two families based on their resistance to being demagnetized (magnetic coercivity).

Hard ferrites have high coercivity, so are difficult to demagnetize. They are used to make permanent magnets for applications such as refrigerator magnets, loudspeakers, and small electric motors.
Soft ferrites have low coercivity, so they easily change their magnetization and act as conductors of magnetic fields. They are used in the electronics industry to make efficient magnetic cores called ferrite cores for high-frequency inductors, transformers and antennas, and in various microwave components.

Ferrite compounds are extremely low cost, being made of mostly iron oxide, and have excellent corrosion resistance. Yogoro Kato and Takeshi Takei of the Tokyo Institute of Technology synthesized the first ferrite compounds in 1930.

What are Permanent Ferrite Magnet/ Speaker Magnets used for?

They are used to make permanent magnets for applications such as refrigerator magnets, loudspeakers, and small electric motors. Soft ferrites have low coercivity, so they easily change their magnetization and act as conductors of magnetic fields.
A Permanent Ferrite Magnet/ Speaker Magnet is able to complete within its magnetic field is up to 160 kiloampere tpm, or up to 2000 oersteds. Ferrite and ceramic magnets are considered to be permanent magnets, which are among the strongest and most durable magnets that exist in the world.

What is a disadvantage of a ferrite core?

The disadvantage is that it is easily saturated (its saturation flux density is typically < 0.5 T). By making cores with different material blends it is possible to achieve desired properties, depen-ding on whether the cores are to be used for communication purposes, power supply, filter purposes, etc.

Material Remanence (Br)
Coercive Force
(Hc)
Intrinsic
Coercive Force
(Hci)
Max Energy
Product (BH)max
mT kG kA/m kOe kA/m kOe kJ/m^3 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
Y10T 200-
235
2.0-
2.35
128-
160
1.61-
2.01
210-
280
2.64-
3.52
6.4-9.6 0.8-1.2
Y20 320-
380
3.2-3.8 135-
190
1.70-
2.39
140-
195
1.76-
2.45
18.0-
22.0
2.3-2.8
Y22H 310-
360
3.1-3.6 220-
250
2.76-
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-
2.39
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 360-
390
3.6-3.9 220-
250
2.76-
3.14
225-
255
2.83-
3.20
23.0-
28.0
2.9-3.5
Y26H-1 360-
390
3.6-3.9 200-
250
2.51-
3.14
225-
255
2.83-
3.20
23.0-
28.0
2.9-3.5
Y26H-2 360-
380
3.6-3.8 263-
288
3.30-
3.62
318-
350
4.00-
4.40
24.0-
28.0
3.0-3.5
Y27H 370-
400
3.7-4.0 205-
250
2.58-
3.14
210-
255
2.64-
3.20
25.0-
29.0
3.1-3.6
Y28 370-
400
3.7-4.0 175-
210
2.20-
2.64
180-
220
2.26-
2.76
26.0-
30.0
3.3-3.8
Y28H-1 380-
400
3.8-4.0 240-
260
V3.02-
3.27
250-
280
3.14-
3.52
27.0-
30.0
3.4-3.8
Y28H-2 360-
380
3.3-3.8 271-
295
3.41-
3.71
382-
405
4.80-
5.09
26.0-
30.0
3.3-3.8
Y30 370-
400
3.7-4.0 175-
210
2.20-
2.64
180-
220
2.26-
2.76
26.0-
30.0
3.3-3.8
Y30BH 380-
390
3.8-3.9 223-
235
2.80-
2.95
231-
245
2.90-
3.08
27.0-
30.0
3.4-3.8
Y30H-1 380-
400
3.8-4.0 230-
275
2.89-
3.46
235-
290
2.95-
3.64
27.0-
32.0
3.4-4.0
Y30H-2 395-
415
3.95-
4.15
275-
300
3.46-
3.77
310-
335
3.90-
4.21
27.0-
32.5
3.4-4.1
Y32 400-
420
4.0-4.2 160-
190
2.01-
2.39
165-
195
2.07-
2.45
30.0-
33.5
3.8-4.2
Y32H-1 400-
420
4.0-4.2 190-
230
2.39-
2.89
230-
250
2.89-
3.14
31.5-
35.0
4.0-4.4
Y32H-2 400-
440
4.0-4.4 224-
240
2.81-
3.02
230-
250
2.89-
3.14
31.0-
34.0
3.9-4.3
Y33 410-
430
4.1-4.3 220-
250
2.76-
3.14
225-
255
2.83-
3.20
31.5-
35.0
4.0-4.4
Y33H 410-
430
4.1-4.3 250-
270
3.14-
3.39
250-
275
3.14-
3.46
31.5-
35.0
4.0-4.4
Y34 420-
440
4.2-4.4 200-
230
2.51-
2.89
205-
235
2.58-
2.95
32.5-
36.0
4.1-4.5
Y35 430-
450
4.3-4.5 215-
239
v2.70-
3.00
217-
241
2.73-
3.03
33.1-
38.2
4.2-4.8
Y30H-1 380-
400
3.8-4.0 230-
275
2.89-
3.46
235-
290
2.95-
3.64
27.0-
32.0
3.4-4.0
Y30H-2 395-
415
3.95-
4.15
275-
300
3.46-
3.77
310-
335
3.90-
4.21
27.0-
32.5
3.4-4.1
Y32 400-
420
4.0-4.2 160-
190
2.01-
2.39
165-
195
2.07-
2.45
30.0-
33.5
3.8-4.2
Y32H-1 400-
420
4.0-4.2 190-
230
2.39-
2.89
230-
250
2.89-
3.14
31.5-
35.0
4.0-4.4
Y32H-2 400-
440
4.0-4.4 224-
240
2.81-
3.02
230-
250
2.89-
3.14
31.0-
34.0
3.9-4.3
Y33 410-
430
4.1-4.3 220-
250
2.76-
3.14
225-
255
2.83-
3.20
31.5-
35.0
4.0-4.4
Y33H 410-
430
4.1-4.3 250-
270
3.14-
3.39
250-
275
3.14-
3.46
31.5-
35.0
4.0-4.4
Y34 420-
440
4.2-4.4 200-
230
2.51-
2.89
205-
235
2.58-
2.95
32.5-
36.0
4.1-4.5
Y35 430-
450
4.3-4.5 215-
239
v2.70-
3.00
217-
241
2.73-
3.03
33.1-
38.2
4.2-4.8
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