Souwest Magnetech Ferrite Magnets

Ferrite magnets are permanent magnets in china made mainly from SrO or BaO and Fe2O3-- They are electrically insulating so current does not pass through them due to their extremely high electrical resistance, hence their other name of Ceramic Magnets. Compared with other permanent magnets, ferrite bar magnets are hard and brittle, with lower magnetic energy. However, it is not easy to demagnetize and corrode, and the production process is simple and inexpensive. Therefore, ferrite disc magnets have the highest production volume in the whole magnet industry and are widely used in other industries.

What Are The Differences Between Hard Magnets and Soft Magnets of Ferrite Magnets

Hard Magnets

The ferrite used in permanent magnets is hard ferrite, which has high coactivity and reminisces after magnetization. Iron oxide and barium carbonate or strontium carbonate are used to make hard ferrite. Because of their high coactivity, hard ferrites are not easily demagnetized, which is an important characteristic of permanent magnets. Hard ferrites can produce magnetic flux and also have a high magnetic permeability. Hard ferrites, also known as ceramic magnets, are inexpensive and are commonly used in household products (e.g. refrigerator magnets).

Soft Magnets

Ferrites used in transformers or electromagnet cores that include nickel; zinc or manganese compounds have a low coactivity and are generally referred to as soft ferrites. The low coactivity means that the magnetization strength of the material can be changed from positive to negative without consuming much energy (hysteresis), and the high resistivity of the material itself reduces another source of energy loss: the generation of eddy currents. Due to the low losses at high frequencies, it is commonly used in the cores of RF transformers and in the reactors used in switching power supplies.

Magnetic Properties of Ferrite Magnets

Standard of Ferrite Magnets

Material Remanence Coercivity Intrinsic Coercivity Max.Energy Product

Br Hcb Hcj (BH)max

MT KG KA/m KOe KA/m KOe KJ/m3 MGOe

C1 230 2.3 148 1.86 258 3.5 8.36 1.05

C5 380 3.8 191 2.4 199 2.5 27 3.4

C7 340 3.4 258 3.23 318 4 21.9 2.75

C8A 385 3.85 235 2.95 242 3.05 27.8 3.5

C8B 420 4.2 232 2.913 236 2.96 32.8 4.12

C9 380 3.8 280 3.516 320 4.01 26.4 3.32

C10 400 4 288 3.617 280 3.51 30.4 3.82

C11 430 4.3 200 2.512 204 2.56 34.4 4.32

Special Ferrite Segment Magnetic Properties Table

Grade Mag Spring MS Y30 MS Y35H-1 MS Y35H-2 MS Y35H-3 MS Y35H-4H

MMPA C8 C8D C8B

TDK FB4B FB4D FB4G

Br Type 395(3950) 405(4050) 400(4000) 415(4150) 380(3800)

mT(Gs) min 385(3850) 395(3950) 390(3900) 405(4050) 370(3700)

Hcb Type 200(2500) 255(3200) 279(3500) 235(2950) 286(3600)

KA/m(Oe) min 176(2200) 251(3150) 236(3300) 223(2800) 270(3400)

Hcj Type 205(2570) 263(3300) 287(3600) 243(3050) 342(4300)

KA/m(Oe) min 184(2300) 255(3200) 275(3450) 231(2900) 326(4100)

(BH)max Type 29.0(3.7) 31.2(3.9) 30.4(3.87) 32.8(4.1) 27.2(3.4)

KJ/m 3

(MGOe) min 27.5(3.45) 29.6(3.7) 28.8(3.6) 30.2(3.8) 25.6(3.2)

Grade Mag spring MS Y38B MS Y38H MS Y40E MS Y40B MS Y45E MS Y45B

MMPA C12 C9

TDK FB5B FB5H FB6E FB6B FB9H FB6N

Br Type 420(4200) 405(4050) 380(3800) 420(4200) 430(4300) 440(4400)

mT(Gs) min 410(4100) 395(3950) 370(3700) 410(4100) 420(4200) 430(4300)

Hcb Type 263(3300) 298(3750) 290(3650) 302(3800) 330(4150) 259(3250)

KA/m(Oe) min 251(3150) 287(3600) 279(3500) 290(3650) 318(4000) 247(3100)

Hcj Type 267(3350) 322(4050) 398(5000) 318(4000) 398(5000) 263(3300)

KA/m(Oe) min 255(3200) 311(3900) 382(4800) 307(3850) 386(4850) 251(3150)

(BH)max Type 33.4(4.2) 31.1(3.9) 27.5(3.4) 33.5(4.2) 35.0(4.4) 36.7(4.6)

KJ/m 3

(MGOe) min 31.8(4.0) 29.5(3.7) 25.6(3.2) 32.6(4.0) 33.5(4.2) 35.1(4.4)

FAQs About Ferrite Magnets

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What are ferrite magnets used for?

Hard ferrites are used to make permanent magnets such as refrigerator magnets, speakers and small electric motors. Soft ferrites have low interactivity, so they easily change magnetization, acting as conductors of magnetic fields.

Are ferrite magnets safe?

Magnets are incredibly useful and fun, but they also have danger. Ferrite magnets can shatter into pieces if you apply force repeatedly. Fragments of the broken magnet may cause injury to the user or stand.

How do you cut a ferrite magnet?

Ferrite cannot be cut with ordinary tools. However, it is possible to use the heating ring cutting method. Specifically, a resistance wire is used to form a ring at the prepared cutting point to form a large temperature difference through a large current and then quickly cooled.

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