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
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.
Now the ferrite magnet price is reasonable, if you have needs, please contact us.
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