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Permanent Magnet Characteristics

Permanent magnets are magnets that do not have the ability to maintain magnetism for a long time under the action of an external magnetic field, they are widely used in a variety of electronic products, motors, electrical appliances, speakers, security, toys and other fields, today to introduce some of the characteristics of permanent magnets.


What are the key characteristics of permanent magnets?

The key characteristics of permanent magnets include remanent magnetism, coercivity, maximum magnetic energy product, Curie temperature, corrosion resistance, mechanical properties, permeability, etc. The following is a brief introduction to these characteristics to give you an understanding.


Remanence (Br): Remanence is the magnetic induction (B) that a permanent magnet retains after the external magnetic field has been removed. The higher the remanence, the stronger the permanent magnet's ability to retain its magnetism.


Coercivity (Hc): Coercivity is the amount of reverse magnetic field that needs to be applied to reduce the magnetization strength (M) of a permanent magnet to zero after it has been magnetized to saturation. A high coercivity indicates that the magnet is able to resist the reverse action of an external magnetic field and remain magnetic and not easily demagnetized.


Maximum Magnetic Energy Product (BHmax or (BH)max): The magnetic energy product is the maximum magnetic energy density (BHmax) of a permanent magnet and is often used to measure the energy storage capacity of a magnet. A larger magnetic energy product indicates that the magnet can provide a stronger magnetic field.


Curie temperature: The magnetic properties of permanent magnets change with temperature. Different permanent magnetic materials have different Curie temperatures, above which the magnetic properties will be significantly reduced or even disappear.


Magnetic Permeability: Magnetic permeability is the degree to which a material responds to a magnetic field. Permanent magnets typically have a low permeability because their primary role is to generate rather than conduct magnetic fields.


Thermal Stability: Thermal stability refers to the ability of a permanent magnet to maintain its magnetic properties at different temperatures. Highly thermally stable magnets show less fluctuation in performance as the temperature changes.

   

Corrosion Resistance: The corrosion resistance of permanent magnets is important for applications in wet or chemically corrosive environments. Some permanent magnet materials require coatings or plating to improve their corrosion resistance.


Typical Characteristic Parameter Data for Various Permanent Magnet Materials

Permanent Magnet Material

(BH)max
MGOe

Hcj
KOe

Rev Temp Coeff
Br%/ºC

Max Working Temp
ºC

Corrosion
Resistance

SmCo5

18-25

16-25

-0.045

200-250

Excellent

Sm2Co17

25-32

10-32

-0.03

300-350

Excellent

NdFeB

28-52

10-25

-0.12

80-220

Poor

Ferrite

3.0-4.5

3.0-4.5

-0.19

150-250

Excellent

ALNICO

5.0-10

0.6-1.8

-0.03

450-500

Fair


The cost of different permanent magnet materials varies greatly, when choosing, you need to weigh the performance and cost, if you need help, you can send us an email or online message.


Typical permanent magnet materials;

Rare earth powerful neodymium - Rare Earth Neodymium Magnets

Corrosion-resistant low-cost ferrite without plating - Sintered Ferrite (Ceramic) Magnets

High temperature and high cost samarium cobalt - Samarium Cobalt (smco) Magnets


Other related articles;

Temperature coefficient and characteristic curve of neodymium magnets

Temperature Characteristics and Coefficients of Ferrite Magnets

Neodymium Temperature Range (Rating)

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