• All specifications are subject to change without notice. • Conformity to RoHS Directive: This means that, in conformity with EU Directive 2002/95/EC, lead, cadmium, mercury, hexavalent chromium, and specific

bromine-based flame retardants, PBB and PBDE, have not been used, except for exempted applications.

NEOREC series

Neodymium-Iron-Boron Magnets

Issue date: May 2011

Introduction.................................................................................. 1

Features/Applications.................................................................. 2

Br/HCJ Characteristics Distribution .............................................. 3

Irreversible Demagnetization Characteristics .............................. 5

Magnet Structures/Magnetic Characteristics/

Rust Prevention Treatments..................................................... 6

Demagnetization Curves/Magnetic Characteristics

NEOREC53B........................................................................... 8

NEOREC50H........................................................................... 9

NEOREC50B......................................................................... 10

NEOREC47B......................................................................... 11

NEOREC47H......................................................................... 12

NEOREC46HF....................................................................... 13

NEOREC46HG...................................................................... 14

NEOREC44H......................................................................... 15

NEOREC41H......................................................................... 16

NEOREC45SH ...................................................................... 17

NEOREC42SH ...................................................................... 18

NEOREC43SX....................................................................... 19

NEOREC40UH ...................................................................... 20

NEOREC38UH ...................................................................... 21

NEOREC40TH....................................................................... 22

NEOREC35UX ...................................................................... 23

NEOREC35NX ...................................................................... 24

NEOREC30EV....................................................................... 25

NEOREC42B......................................................................... 26

NEOREC40H......................................................................... 27

NEOREC37H......................................................................... 28

Conformity to RoHS Directive: This means that, in conformity with EU Directive 2002/95/EC, lead, cadmium, mercury, hexavalent chromium, and specific bromine-based flame retardants, PBB and PBDE, have not been used, except for exempted applications.

NEOREC(NEODYMIUM-IRON-BORON) MAGNETS

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• All specifications are subject to change without notice.

Neodymium-Iron-Boron Magnets NEOREC Series

INTRODUCTION

In recent years, small, high-performance rare-earth magnets have been in increasing demand for use in electronics equipment.

In 1977, TDK commercialized a 2-17 type REC magnet, solving the problem of high cost, the main drawback with conventional samarium-

cobalt magnets. It not only achieved better cost-performance, its superior performance was appraised as being the highest in the world.

The NEOREC magnet is a new product, surpassing the REC magnet. The main raw materials are neodymium, a rare-earth element, iron

and boron. Its magnetic characteristics at the mass production level reach 49MGOe in maximum energy product(BH), achieving 50 to

80% high performance with 10% reduction in specific gravity compared with samarium-cobalt magnets.

Ideal for meeting miniaturization and weight reduction needs for VCMs and other equipment. TDK offers a selection of custom magnets in

any shapes and sizes to meet customers’ requirements.

TDK also provides a range of technical services, including design of NEOREC magnet-applied products. For further information, please

contact TDK or your nearest representatives.

• Development of this product was made under license granted for the use of proprietary techniques developed by Hitachi Metals, Ltd.

• Conformity to RoHS Directive: This means that, in conformity with EU Directive 2002/95/EC, lead, cadmium, mercury, hexavalent chromium, and specific bromine-based flame retardants, PBB and PBDE, have not been used, except for exempted applications.

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FEATURES/APPLICATIONS

FEATURES • Magnetic characteristics at the mass production level reach 49MGOe in maximum energy product(BH) max, achieving 50 to 80%

higher performance than rare-earth cobalt magnet.

• The specific gravity is 7.4g/cm3 more than 10% lower than that of rare-earth cobalt magnet. Ideal for meeting miniaturization and weight

reduction needs.

• Higher mechanical strength such as bending and tensile strength than rare-earth cobalt magnets, making handling easier than before.

• Since the main raw materials are neodymium and iron, both abundant resources, stable supply is assured.

APPLICATIONS Actuators for magnetic and optical disks, core-less motors, servomotors, stepping motors, MRI’s printers, sensors, magnetrons, klystrons,

magnetic bearings, magnetic couplings, etc.

DIFFRENCES BETWEEN NdFe-MAGNET AND SmCo-MAGNET

∗ C// is the value measured in the easy magnetization direction. C⊥ is the value measured in the vertical direction to the easy magnetization direction.

Item NdFe-magnet SmCo-magnet Composition Nd, Fe, B, and other additives Sm, Co, Fe, Cu, and other additives Manufacturing method Sintering Sintering Magnetic characteristics Maximum energy product (BH)max 28 to 49MGOe 16 to 32MGOe Residual flux density Br 10.3 to 13.0kG 8.2 to 11.6kG Intrinsic coercive force HCJ 11.0 to 25.0kOe 6.2 to 20.0kOe Recoil permeability 1.05 1.05 Reversible temperature coefficient of Br –0.11 to –0.13%/°C –0.03 to –0.04%/°C Temperature coefficient of HCJ –0.55 to –0.65%/°C –0.15 to –0.30%/°C Physical characteristics Curie temperature 320°C 800°C Density 7.3 to 7.5g/cm3 8.2 to 8.4g/cm3

Thermal expansion coefficient C//∗(0 to 100°C) 5.2× 10–6/°C 8× 10–6/°C C⊥ ∗(0 to 100°C) –0.8× 10–6/°C 11× 10–6/°C

Mechanical characteristics Deflection strength 25kg/mm2 15kg/mm2

Compressive strength 110kg/mm2 82kg/mm2

Tensile strength 7.5kg/mm2 3.6kg/mm2

Vickers hardness 550 to 650 500 to 550 Electric resistance 130× 10–6Ω cm 86× 10–6Ω cm

Required magnetizing field 25kOe min. 15kOe min.(SmCo5 system) 25kOe min.(Sm2Co27 system)

Resistance to cracking Solid, hard to break Brittle easily Resistance to rust Relatively easy to rust Relatively resistant to rust

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Br/HCJ CHARACTERISTICS DISTRIBUTION

5 10 15 20 25 30

500

(kG)[T]

35 (kOe)

[kA/m]

15

14

13

12

11

10

9

8

7

6

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

30002500200015001000

R es

id ua

l f lu

x de

ns ity

B r

Intrinsic coercive force HCJ

NEOREC(Nd-Fe-B magnets)

Sm-Co magnets

CM(Nd-Fe-B Bonded magnets)

CM8BLH

CM8BL

CM11SHCM11UH

50B 47H50H

44H

46HF

46HG

42SH

45SH

38UH

40UH 40TH

43SX

32A 30

24

26

22

32AH

18

40H

37H

26A

47B

42B

Transverse magnetic field press

Axial magnetic field press

41H

53B

35UX 30EV

35NX

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TRANSVERSE MAGNETIC FIELD PRESS

AXIAL MAGNETIC FIELD PRESS

2500[kA/m]

35(kOe)10 15 20 25 30 10

11

15 (kG)

12

13

14

Intrinsic coercive force HCJ

R es

id ua

l f lu

x de

ns ity

B r

1000 1500 2000

53B

50H

44H

42SH

45SH

47B

50B

41H

35UX

38UH

43SX

47H

46HF

40UH

1.5 [T]

1.0

1.1

1.2

1.3

1.4

Pole piece Direction of

magnetic field

Under punch

Upper punch

Direction of pressed powder

Die

Magnetic powder

Magnetic field coil

• Block magnet(type) for pick up

SN • For automotive

actuator • For pager

• For FA’s motor

2500[kA/m]

35(kOe)10 15 20 25 30 10

11

15 (kG)

12

13

14

Intrins