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Neodymium (NdFeB) magnets

Neodymium magnets are the most powerful magnets in present with excellet magnetic properties, like remanence and energy product. Neodymium magnets are rare-earth metal based, main components are iron (Fe), neodymium (Nd) and boron (B). Other elements are mixed into the final alloy, like cobalt (Co), dysprozium (Dy) - these elements are added to improve magnetic parameters (remanence, coercivity) and thermal stability (maximum working temperature).


Neodymium magnets are pressed in magnetic field where  magnetic domains are alligned into one direction and finally sintered in special vacuum sintering rooms. The final stage is coating by nickel or zinc to prevent undesired oxidation. This is why neodymium magnets are nice, glossy and smooth-faced. NdFeB magnets can be coated also other ways: gold, chrome, epoxy coating, passivation and the most advanced technology is aluminium and titanium nitride coating.

Neodymium magnets are usually supplied as anisotropic, working temperature is between +80 and +240°C depending on material grade.

 

Table of magnetic properties of neodymium magnets:

Material

Remanence

Br (T)

Coercivity Hc (kA/m)

Max. energy product

(BxH)max (kJ/m3)

Max. working temp.*

Tw (°C)

Normal Hcb Intrinsic Hci
N30 1.08 - 1.13 >= 796 >= 1353 223 - 247 80 - 240
N33 1.13 - 1.17 >= 812 >= 1353 247 - 271 80 - 240
N35 1.17 - 1.22 >= 868 >= 955 263 - 287 80 - 200
N38 1.22 - 1.25 >= 899 >= 955 287 - 310 80 - 180
N40 1.25 - 1.28 >= 907 >= 955 302 - 326 80 - 180
N42 1.28 - 1.32 >= 915 >= 955 318 - 342 80 - 150
N45 1.32 - 1.38 >= 923 >= 955 342 - 366 80 - 150
N48 1.38 - 1.42 >= 923 >= 955 366 - 390 80 - 120
N50 1.40 - 1.45 >= 796 >= 796 382 - 406 60 - 100
N52 1.43 - 1.48 >= 796 >= 876 398 - 422 60
N54 1.45 - 1.51 >= 939 >= 875 405 - 437 60


*Maximum working temperature is differentiated by adding an alphabetical code after the code of material grade (e.g. N35EH = 200°C). Increasing the maximum working temperature results in gradual decrease of material grade:

no code - Tw <=80°C (for N52 and N54 max. 60°C)

M - Tw <=100°C

H - Tw <=120°C

SH - Tw <=150°C

UH - Tw <=180°C

EH - Tw <=200°C

AH - Tw <=240°C

 

Neodymium magnets are hard, brittle and sensitive to crack, so machining is problematic because the protective coating is corrupted. Machining can be carried out by grinding with diamond tools, but the coating must be repaired.

NdFeB magnets have excellent resistance to external magnetic fields and in normal conditions keep their magnetic properties during long time.


Other magnetic and mechanic parameters of neodymium magnets:

Temp. coefficient of Br (%/°C) Temp. coefficient of Hci (%/°C) Magnetizing field (kA/m) Curie temp. (°C) Density (g/cm3) Hardness (Hv)
- 0.12 - 0.6 2400 310 - 340 7.5 570

 

 
 

NdFeB

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Neodymium disc, anisotropic
ACTION

Neodymium disc, anisotropic

magnetized through thickness H (axially)
from 0,25 €
Neodymium block, anisotropic
ACTION

Neodymium block, anisotropic

magnetized through thickness H
from 0,11 €

Neodymium ring, anisotropic

magnetized through thickness H (axially)
from 1,72 €
Neodymium ring with 90° counterbore, anisotropic
ACTION

Neodymium ring with 90° counterbore, anisotropic

magnetized through thickness H (axially)
from 1,44 €
Neodymium disc, adhesive (set of 2 pieces)
ACTION

Neodymium disc, adhesive (set of 2 pieces)

magnetized through thickness H (axially)
from 0,56 €

Neodymium disc, diametric magnetization

magnetized through diameter
from 0,55 €

Neodymium segment, anisotropic

magnetized through thickness H (axially)
14,62 €
Office magnet, neodymium, round, white
Nové

Office magnet, neodymium, round, white

Office magnets with neodymium (NdFeB) magnet
from 0,66 €
Office magnet, neodymium, round, black
Nové

Office magnet, neodymium, round, black

Office magnets with neodymium (NdFeB) magnet
from 0,66 €
Office magnet, neodymium, round, green
ACTION

Office magnet, neodymium, round, green

Office magnets with neodymium (NdFeB) magnet
from 0,66 €
Office magnet, neodymium, round, blue
Nové

Office magnet, neodymium, round, blue

Office magnets with neodymium (NdFeB) magnet
from 0,66 €
Office magnet, neodymium, round, orange
Nové

Office magnet, neodymium, round, orange

Office magnets with neodymium (NdFeB) magnet
from 0,66 €
Office magnet, neodymium, round, red
Nové

Office magnet, neodymium, round, red

Office magnets with neodymium (NdFeB) magnet
from 0,66 €
Office magnet, neodymium, round, yellow
Nové

Office magnet, neodymium, round, yellow

Office magnets with neodymium (NdFeB) magnet
from 0,66 €
Office magnet, neodymium, square, white
Nové

Office magnet, neodymium, square, white

Office magnets with neodymium (NdFeB) magnet
from 1,92 €
Office magnet, neodymium, square, yellow
Nové

Office magnet, neodymium, square, yellow

Office magnets with neodymium (NdFeB) magnet
from 1,92 €
Office magnet, neodymium, square, orange
Nové

Office magnet, neodymium, square, orange

Office magnets with neodymium (NdFeB) magnet
from 1,92 €
Office magnet, neodymium, square, red
Nové

Office magnet, neodymium, square, red

Office magnets with neodymium (NdFeB) magnet
from 1,92 €
Office magnet, neodymium, square, green
Nové

Office magnet, neodymium, square, green

Office magnets with neodymium (NdFeB) magnet
from 1,92 €

 
 
 
 
 
 
 
 
 
 
 
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