Ferrite magnets are permanent magnets 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 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 magnets have the highest production volume in the whole magnet industry and are widely used in other industries.
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).
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.
| 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 |
| 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) |
Ferrite C5 and Ferrite C8 magnets dominate high-temperature applications due to their intrinsic thermal stability (up to 250°C) and high coercivity (>3,000 Oe). Unlike low-cost permanent magnets like Alnico, ferrites retain 85% of flux density at elevated temperatures, making them ideal for DC motors in automotive systems or magnetic separators in recycling plants. Their anisotropic structure enhances temperature resistance compared to isotropic grades. Ceramic ring magnets, a subset of ferrites, are widely used in furnace sensors or industrial ovens where electrical insulation is critical. While Neodymium magnets fail above 150°C, Ferrite C8’s stability and corrosion resistance (no coatings required) justify their use in harsh environments. However, their lower energy product (~4 MGOe) limits miniaturization. For applications like electric vehicle cooling pumps, ferrite’s balance of cost, durability, and thermal performance remains unmatched.
Custom-shaped ferrite magnets address niche industrial demands, such as arc segments for speaker magnets or trapezoidal blocks for magnetic separators. Anisotropic ferrites (e.g., Ferrite C8) are pressed in magnetic fields to align grains, achieving 20% higher flux density than isotropic grades. Ceramic ring magnets with precision-drilled holes are used in brushless DC motors for HVAC systems, leveraging their electrical insulation to reduce eddy losses. Custom geometries also optimize magnetic circuits in conveyor belt systems or sensor arrays. While low-cost permanent magnets like bonded ferrites suit prototyping, sintered anisotropic grades ensure durability in high-vibration machinery. A key trade-off is brittleness: complex shapes (e.g., multi-pole arc magnets) require diamond cutting tools. For cost-sensitive projects like consumer speaker magnets, isotropic ferrites (Ferrite C5) offer adequate performance with minimal tooling expenses.
Ferrite magnets cost 90% less than Neodymium per kg, making them the go-to choice for high-volume applications like speaker magnets or DC motors. While Neodymium boasts superior energy density (up to 52 MGOe), ferrites excel in electrical insulation and corrosion resistance, eliminating coating costs. For example, magnetic separators use anisotropic Ferrite C8 magnets for their high coercivity and thermal resilience, whereas Neodymium would require frequent replacements in abrasive environments. However, Neodymium’s compactness benefits miniaturized tech (e.g., drones), offsetting its higher price. In mid-temperature industrial equipment (≤150°C), hybrid solutions pair low-cost permanent magnets (ferrite cores) with Neodymium assist layers to balance budget and performance. Lifetime cost analysis often favors ferrites for infrastructure-scale projects like wastewater treatment plants, where durability and low maintenance outweigh raw power needs.
As leading suppliers of ferrite magnets for sale, we provide cost-effective ceramic magnets (grades C5, C8) with exceptional electrical insulation and temperature resistance up to 250°C (482°F). Ideal for mass production applications like speaker assemblies, magnetic separators, and DC motor manufacturing.
Budget-Friendly: 30-50% lower cost than rare-earth magnets for large-scale projects.
High Coercivity: Resistant to demagnetization in dynamic operating conditions.
Customization: Available in rings, arcs, blocks, and multi-pole magnetized designs.
Our isotropic and anisotropic ferrite magnets are widely used in:
✔️ Automotive sensors and alternators
✔️ Microwave oven door seals
✔️ Material handling magnetic lifters
✔️ Educational science kits
While neodymium magnets offer higher strength, ferrite magnets dominate in cost-sensitive and high-temperature environments. Explore our guide "Ferrite vs Neodymium Magnets: When to Choose Which" for application-specific recommendations.
Bulk Order Benefits: Request a quote for volume purchases of ceramic ring magnets – MOQ 500 pcs with 15-day lead time.
Round, cylindrical ferrite magnet for many uses.
Special arc shaped ferrite magnets save your costs.
Slender bar-shaped ferrite magnets can be used for magnetic tool bars.
Square and block ferrite magnet with thickness direction magnetization.
Economical circular shaped ferrite magnet.
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.
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.
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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