Neodymium Magnets

NEOREC Series
Product Guide
Introduction
Magnetic characteristics transition of TDK neodymium magnet

Features of TDK neodymium magnets

Magnetic characteristics distribution charts of NEOREC Series
Transition of dysprosium reduction / new material development

Typical material characteristics

Example of magnetic characteristics
Example of physical / mechanical characteristics

Surface Treatment

Precautions regarding safety and use

Contents Update : MARCH 2017

The details can be found by referring to the appended individual delivery specifications.
All specifications are subject to change without notice.

magnet_neo_summary_en/ 20170301

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Neodymium Magnets
NEOREC Series
Introduction
The NEOREC series of magnets consists mainly of neodymium, which is a rare-earth element, iron, and
boron, and takes full advantage of TDK's state-of-the-art magnetic powder metallurgy technologies.
Currently, a maximum energy product of 406KJ/m3 (51MGOe) has been attained. We are striving to further
advance the NEOREC series while exchanging results obtained through technological efforts and our
unique know-how achieved during such processes among related technical divisions.
Avoid using materials with a high risk of uneven distribution or market fluctuations, such as Dy (dysprosium),
and pioneer a new magnetic property range equivalent to or better than those of the world's highest
level high-power materials that have been achieved so far – this is an essential initiative for establishing
a permanent and stable supply system for low-cost high-power magnet materials.
We have established a mass-production/supply system for a completely Dy-free material that is compa-
rable to the Dy-added NEOREC 55 series, which has achieved the world's highest level maximum energy
product. Meanwhile, we have also developed our unique High Anisotropy field Layer (HAL) production
process, which achieves enhanced magnetic coercive force by selectively diffusing Dy in the grain
boundary layer of the portions of a magnet that can easily be demagnetized. In order to respond to the
latest needs in the technical fields where magnets are applied, including motors, sensors, and actuators,
we are committed to lineup expansion and power enhancement of the Dy-free NEOREC series magnets.
We have established an " in-market " service system so as to respond quickly to orders from our customers
and address in detail their requests for technical services, with our domestic and overseas manufacturing
and service bases as contact points. Responding quickly and accurately to the market needs and
promoting development of new markets together with our customers - this is the basic attitude of TDK,
who has over 50 years of history of ferrite magnet development.
As a manufacturer providing abundant know-how on magnetic circuit designs as well as high-quality,
high performance magnets, we positively support the acceleration and optimization of product designs
using magnets.

Magnetic characteristics transition of TDK neodymium magnet

(MG Oe) (kJ/m 3)
100 800

70 600
NEOREC55
NEOREC50
50 400
Neodymium NEOREC53
Maximum energy product ( BH )max

Sm2Co17
30
200

Al-Ni-Co-Fe
100 Nd-Fe-B-Plastic
10 80
Al-Ni-Co-Fe
7 60 SmCo5
FB12 FB13B/FB14H
Al-Ni-Co-Fe FB9
5 40 Sr-ferrite FB5 FB6
FB5D
Ba-ferrite FB4D
FB3N

3 Sr-ferrite
Ba-ferrite
20
NKS Steel
MK Steel

Ba-ferrite
10
KS Steel Co-ferrite
1 8
1920 1930 1940 1950 1960 1970 1980 1990 2000 2010 2020
Year

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All specifications are subject to change without notice.

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Neodymium Magnets
NEOREC Series
Features of TDK Neodymium magnets
This neodymium magnet achieved the world's highest levels of residual
magnetic flux density Br, intrinsic coercive force HCJ , and (BH)max.
A wide variety of magnetic characteristics provides a choice
of most suitable type, enabling drastic down-sizing, slimming,
and increased power of magnet applied devices.
NEOREC50BF/47HF/45MHF/45BF : Dy free material

Magnetic characteristics
distribution charts of NEOREC Series
15 1.5
( kG) (T)

50BF 50H 51DSX

HAL* High performance neodymium magnet
for IPM motor
Residual magnetic flux density Br

14 1.4 47B
47HF 48DUH
45MHF
45BF HAL*
Axial 46HF 62 Transverse magnetic field
44H 45SH Series
molding process
46HG 44DUX ( HAL*)

42B 43SX HAL* 55 Transverse magnetic field

Axial Series molding process
13 1.3 42SH
40TH
40UH
40H 53 Transverse magnetic field
Axial Series molding process
38UH 38UX
Transverse magnetic field
molding process
50F
35NX Series
12 1.2 Axial magnetic field
35UX molding process
Transverse magnetic field
Dy
molding process
30EV Free
Axial magnetic field
molding process
11 1.1
1000 1500 2000 2500 3000 (kA/m)

10 15 20 25 30 35 40 HAL : Method for increasing coercive

(kOe) *
force, by diffusing the heavy rare-earth
Intrinsic coercive force HCJ ( kA/m)
element from the surface of the mag-
nets to inside.

Transition of Dy (dysprosium) reduction/new material development

45 Series Substantially reduce the oxidation of
alloy powder ( impurities generated ) by
50F Series precision atmosphere control

Dy Impurity
Oxide

content Boundary
53 Series Boundary

Reduce 55 Series

Nd 2 Fe14 B
HAL Nd 2 Fe14 B

Dy Free
0
1995 2000 2005 2010 2015 50F Series 53 Series

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All specifications are subject to change without notice.

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Neodymium Magnets
NEOREC Series
Typical material characteristics
Example of Magnetic characteristics
Residual Coercive Intrinsic Maximum
Material Molding Material magnetic flux density force coercive force energy product
group process name
Br (mT) HCB (kA/ m) HCJ (kA/ m) (BH )max (kJ/ m3 )
NEOREC51DSX*
62 Series Transverse magnetic field
(HAL)
NEOREC48DUH*
NEOREC44DUX*
55 Series Transverse magnetic field NEOREC50H
NEOREC50BF
Dy Free Transverse magnetic field NEOREC47HF
NEOREC45MHF
Dy Free Axial magnetic field NEOREC45BF
NEOREC45SH
NEOREC43SX
NEOREC40UH
53 Series Transverse magnetic field
NEOREC40TH
NEOREC38UX
NEOREC35NX
NEOREC47B
NEOREC46HF
NEOREC44H
NEOREC46HG
50F Series Transverse magnetic field
NEOREC42SH
NEOREC38UH
NEOREC35UX
NEOREC30EV
NEOREC42B
50F Series Axial magnetic field
NEOREC40H

*Magnetic characteristics of materials using HAL method depend on shape and size. For details of the above material, please contact us.
Curie Recoil Magnetizing
temperature 1450
Residual magnetic flux density Br ( mT )

permeability magnetic field 50BF 50H 51DSX

Tc (K ) µ rec (kA/m ) HAL*

603 1.05 >2000 1400 47B

47HF 48DUH
45MHF HAL*
45BF
Axial 46HF
1350 44H 45SH
44DUX
46HG
42B 43SX HAL*
Axial
1300 42SH
40TH
40UH
40H
Axial

1250 38UH 38UX

35NX
1200 35UX

1150
30EV

1100
1000 1500 2000 2500 3000
Motor-generator for HEV
Intrinsic coercive force HCJ ( kA/m)
Physical and mechanical characteristics
Specific Thermal expansion
coefficient Flexural Compressive Tensile Young's
Density heat strength strength strength modulus Vickers
(Mg/m3 ) (J/kg•K ) (ppm/K ) hardness Hv
(MPa ) (MPa ) (MPa ) (GPa )
C//*1 C *2
7.5 to 7.6 419 5.2 - 0.8 270 1100 74 170 600

*1. C// : Measurement value in the direction of easy magnetization

*2. C : Measurement value in the direction perpendicular to the direction of easy magnetization

The details can be found by referring to the appended individual delivery specifications. magnet_neo_summary_en/20170301
All specifications are subject to change without notice.

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Neodymium Magnets
NEOREC Series
Surface Treatment
The NEOREC series realizes high environmental performance
and functionality with respect to their surface treatment,
including washability, moisture resistance, salt water resistance,
scratch resistance, thermal resistance, electric insulation,
adhesiveness, dimensional precision, and cost advantage.
In order to respond to various reliability requirements concern-
ing magnet-applied equipment, including motors, sensors,
actuators, and speakers, with optimal environmental perfor-
mance balance and functionality, TDK has adopted three film
structures (plating/inorganic/resin). Five types of film formation
processes covering a wide range of development concepts
and applications of magnet-applied equipment are avail-
able as the standard lineup.
In addition, all products in the NEOREC series are compliant with the RoHS directive, including these five
types of surface treatment. For details of RoHS Directive compatible products http://www.tdk.co. jp/rohs

Surface treatment for the NEOREC series / Comparation of Features and specifications
Ni plating
with uniform Multipurpose
Type MD Coat US Coat UG Coat
electrodeposi- Cu-Ni plating
tion property
Corrosion/scratch Easy corrosion Corrosion resistance Corrosion resistance
Features/advantages Cleanliness
resistance prevention adhesiveness thermal resistance
Standard film thickness 10 to 20 µm 10 to 25 µm 0.5 to 2.5 µm 10 to 30 µm 10 to 30 µm
Material Ni Cu-Ni Inorganic Resin Resin
Moisture PCT*
resistance 85%RH at 85°C
Salt water resistance
Thermal resistance
Adhesiveness
Electric insulation
Washability
Dimensional precision
Cost advantage
HDD ( VCM) OA /AV equipment OA /AV equipment
Small Home appliances, Home appliances, Housing equipment
Major application field
magnetic Housing equipment Industrial equipment
circuits Industrial equipment Automobiles

* Pressure cooker test : 120°C, 100%RH, 2atm

Ni plating / Cu-Ni plating
Ni plating features an excellent uniform electrodeposition (film thickness) property, and has a high
washability that substantially reduces residual dust and foreign objects, along with high dimensional precision.
Cu-Ni plating features high environmental performance, covering a wide range of applications,
from office automation and audio-visual equipment to household and factory automation equipment.
It particularly exhibits an excellent anti-corrosive property and scratch-resistance.
Major application examples
Ni plating: VCMs (voice-coil motors) for HDDs for which high washability is required, small magnets
for magnetic circuits for which high dimensional precision is required at the time of assembly.
Cu-Ni plating: Supports reliability requirements in a wide range of fields, from office automation and
audio-visual equipment to household and factory automation equipment, due to its well-balanced
environment resistance including good thermal resistance.

The details can be found by referring to the appended individual delivery specifications. magnet_neo_summary_en/20170301
All specifications are subject to change without notice.

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Neodymium Magnets
NEOREC Series
Surface Treatment
MD Coat
A low-cost corrosion prevention coating with a film thickness of 0.5 to 2.5 µm.
Exhibits excellent oil resistance and thermal resistance while being a simple inorganic process,
as well as good adhesiveness.
Major application examples
Provides an efficient and proper degree of environmental performance and a low cost merit
to various enclosed motors including those for automotive applications.

US Coat / UG Coat
Two types of resin coat that simultaneously achieve low cost and high functionality.
Both types are provided with significantly high moisture resistance, salt water resistance,
and electric insulation, which are characteristic of resin.
In addition, US Coat features excellent adhesiveness, and UG Coat exhibits outstanding thermal resistance.
Major application examples
US Coat: Motors for various applications, speakers, linear motors for industrial equipment,
and servomotors for which adhesiveness is required along with corrosion resistance
UG Coat: Motors for EVs or HEVs for which high thermal resistance is required

The details can be found by referring to the appended individual delivery specifications. magnet_neo_summary_en/20170301
All specifications are subject to change without notice.

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Neodymium Magnets
NEOREC Series
Part number structure
Example of a standard-shaped product -1 Details on shape and size are specified in the
Segment type individual delivery specification.
Material code
We handle requests for parts in both standard
Shape code : C
and various special shapes. Please contact
Size code (mm) : outer x Inner xL
for details on shape samples, largest and/or
Internal code*
smallest size, etc.
* Includes magnetization
direction code
Example of a standard-shaped product
Material code
Example of a standard-shaped product -2 S : Special shape code
Cylinder type, Circular disc type, Shape code : C
Cylinder type with hole, Ring type, Shape and magnetization
Cubic/cuboid type, Plate-shaped type, direction code : D, DH, RH, W, WH
Cubic/cuboid type with hole, Plate-shaped type with hole Size code (mm) : Point and
description order are
Material code specified per shape
Shape and magnetization direction Internal code
code : D, DH, RH, W, WH
Size code (mm) : Point and
description order are specified
per shape
Internal code

Example -1

Shape Shape code Size description point Size code Magnetization direction
(specified by internal code)

Segment type C exfxb Parallel Radial

øe øf
b

Example -2
Shape and magnetization Size
Shape / Magnetization direction Size code
direction code description point

Cylinder type b
Axial direction D axb
Circular disc type
øa

Cylinder type with hole øb

Axial direction DH
Ring type

c axbxc
Cylinder type with hole Orthogonal to
Ring type axial direction
RH øa

c
Cubic/cuboid type
Plate-shaped type
Thickness direction W axbxc
a
b
a≥b

c
Cubic/cuboid type with hole
Thickness direction WH axbxc
Plate-shaped type with hole a
b
a≥b

The details can be found by referring to the appended individual delivery specifications. magnet_neo_summary_en/20170301
All specifications are subject to change without notice.

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Neodymium Magnets
NEOREC Series
Measurment method for magnetic characteristics
1. Basic magnetic characteristics of each material
Magnet Winding
The basic magnetic characteristics of magnet
materials are measured via the B-H tracer,
which consists of electromagnets, gauss Search coil -1

meters, flux meters, hole probes, and

Search coil -2
so on, using special test pieces
manufactured through the same Electromagnetic pole piece
processes as the product. Hole probe
B-H and J-H demagneti- PC monitor for drawing
zation curves are drawn
based on the basic data
from the B-H tracer,
and basic characteristic
Flux meter
values such as magnetic
flux density Br, intrinsic Gauss meter
coercive force HCJ (and HCB) ,
and maximum energy
product (BH)max can also
be obtained.

2. Magnetic characteristics of each product

The B-H tracer can measure simple block-shaped products. But the consistency (reproducibility) with the
measurement results from the individual designs of application products and manufacturing processes of
the customers who use the magnets is important for the basic magnetic characteristics of individually-
designed products. We therefore follow the conditions and procedures of the simple measurement which
our customers and we arranged in advance.

2-1. Tools for simple measurement of magnetic flux density and magnetic flux amount
The gauss meter and hole probe are used together to measure
Gauss meter
magnetic flux density. The measurement accuracy is achieved
using probe stands and such, which reduce the unevenness of
Handy type predetermined measurement conditions (such as the degree
of close contact, interval, or parallelization between the hole
probe and measured objects).
The flux meter with attached search coils is used to measure the
Hole probe amount of magnetic flux of each product. Measurement values
can still differ because of inconsistent speeds of magnet move-
ments and separation distances from the search coils. The assistive
Handy type
tools best suited to each measurement method can ensure accuracy.
Flux meter
In these simple measurement methods, criterial samples are selected
from products. Comparative measurement with the samples can avoid
errors among measuring instruments.
The representative conceptual models are shown in the following page:

Search coil

The details can be found by referring to the appended individual delivery specifications. magnet_neo_summary_en/20170301
All specifications are subject to change without notice.

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Neodymium Magnets
NEOREC Series
Measurment method for magnetic characteristics
2-2. Measurement of magnetic flux density
b: magnetic flux density at a certain distance
a: Surface magnetic flux density
Hole probe
Spacer (Non-magnetic material)
Hole probe

Close contact Magnet

Magnet

Gauss meter
(or Handy type)
Gauss meter
(or Handy type) Non-magnetic material

2-3. Measurment of amount of magnetic flux

Magnet * Search coil
a: Open flux method Magnetic material Magnet **
Search coil ** Standing still in
the center of
*Adhered in the center of search coils
magnetic body

Non-magnetic material

Magnet Magnet (Lowered vertically)

(Separated horizontally)

Flux meter Flux meter

(or Handy type) (or Handy type)

b: Method using magnetic circuits

Motor structure
Coil (Standing still in the center of magnet) Motor structure
Magnet Coil (Standing still in the center of magnet)
Magnet

Flux meter
(or Handy type)
Flux meter
(or Handy type)

Rotor is horizontally pulled out

Non-magnetic material Rotor is rotated 180 degrees

The details can be found by referring to the appended individual delivery specifications. magnet_neo_summary_en/20170301
All specifications are subject to change without notice.

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Neodymium Magnets
NEOREC Series
Precautions regarding safety and use
Please read these instructions before using the product.

Safety Precautions
When using magnets, pay great attention to safety after reading the following precautions. Using the product
incorrectly may cause the product functions to be damaged or lead to an accident.
In order to use this product even more correctly and safely, please request a delivery specification form from which
more detailed product features and specifications can be confirmed.

WARNING
It is extremely dangerous to bring a magnet close to a person possessing electronic medical equipment such as
a pacemaker or other types of electronic medical equipment. It may impair normal operations of the equipment
and lead to a fatal accident.
Be careful not to swallow magnets.If a magnet is swallowed, consult a doctor immediately. Keep the product out
of the reach of children.

PRECAUTIONS
The following precautions must be strictly observed to avoid the occurrence of injuries or functional failures.
[ Design ] ]
[ Design

In general, a magnet loses its magnetism when heated. Check the temperature characteristics in the product
catalogue and exercise caution to prevent temperatures from become too high during assembly or use.
The property values in the catalogue are not guaranteed values. The property values may not be obtained
depending on the magnet size or other factors. Perform confirmation before starting the design process using
a sample, etc.
Some magnets demagnetize at low temperatures. When using a magnet, be sure to confirm that it has a material
property (demagnetization curve) supporting the maximum and minimum temperatures of the environment in
which it is used.
When magnetizing a magnet, the magnetic property may not be achieved as designed if the magnetization
method, etc., is inappropriate. Consult with us in advance concerning magnetization.
Avoid using or storing magnets in a corrosive gas atmosphere, a highly conductive environment (in water contain-
ing electrolytes, etc.), a hydrogen atmosphere, in acid or alkali, or in an organic solvent. It will cause corrosion,
deterioration of the characteristics or strength of the magnet. Check the delivery specifications concerning the
weather resistance and thermal resistance of the product. If a problem is expected, contact us in advance.
When processing a magnet, magnetization deterioration or magnetization failure may occur. Consult with us
concerning processing conditions. When processing a magnet, pay attention so that chipping or cracking would
not occur.
Magnets are hard and brittle; they may crack or fall out when used in places where vibration or shock is applied.
When using a magnet in such a location, pay attention to the design so that the magnet will not fall out even if it
becomes cracked.
There is a risk that a magnet will be damaged by a high-speed rotating body such as a motor. When performing
design, take preventive measures so that magnet fragments will not scatter even if it is damaged.
When performing press-fitting processing, magnets or the counterpart material may become damaged depend-
ing on the press-fitting conditions. Pay attention to the press-fitting conditions when performing design.
When using an adhesive agent for bonding a magnet to another magnet, a york, a pole piece, or other objects,
check the type, adhesion conditions, environmental resistance, amount, and adhesiveness of the adhesive agent
and give adequate consideration to adhesion reliability.

The details can be found by referring to the appended individual delivery specifications. magnet_neo_summary_en/20170301
All specifications are subject to change without notice.

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Neodymium Magnets
NEOREC Series
[ Assembly/Handling
[ Assembly/Handling
] ]

Since magnetized magnets have a strong attractive force, there is a risk that your fingers or hands may get
caught between two magnets or a magnet and another magnetic substance (metal fragment, knife, scissors,
etc.), resulting in injury. There is also a risk that a magnet will break due to a strong shock caused by the attractive
force, and scattered fragments of the magnet may enter the eyes. In order to avoid such risks, exercise caution
when handling magnetized magnets.
Pay attention to the sharp edges of magnets; they may cause finger or hand injuries.
When magnetizing a magnet using an air-core coil, there is a risk that the magnet may jump out of the coil;
secure the magnet for safety.
A magnetized magnet will attract iron powder or magnet fragments. Pay attention to the environment in which
the magnets are handled, since there are cases where cleaning becomes necessary after assembly.
When bonding a magnet, pay attention so that no oil, dirt or other foreign object adheres to the bonding surface.
It may decrease the adhesive force, causing the magnet to drop off
[ Storage ] ]
[ Storage

Store magnets in places free from impact due to being dropped. Chipping or cracking may be caused by impacts.
Do not store magnets in places where they are exposed to rain or dust or under conditions in which moisture
condensation occurs; surface conditions, physical properties, or magnetic properties may change if stored under
such conditions.
[ Other
[ Other ] ]

Keep magnets away from magnetic recording media such as floppy disks, magnetic cards, magnetic tapes,
prepaid cards, and train tickets. If a magnet is placed close to a magnetic recording medium, recorded
information may be destroyed.
Keep magnets away from electronic devices; if a magnet is placed close to an electronic device, it may affect
its measuring gauge or circuit, resulting in a failure or accident.
If you are allergic to metals, contact with a magnet may cause your skin to become irritated or turn red. If such
symptoms appear, take measures such as wearing protective gloves to avoid direct contact with magnets.
Do not lick magnets. Never drink fluids that came into contact with magnets.
[ Special
[ Special Note
Note Concerning
Concerning Neodymium
Neodymium ] ]
Magnets
Magnets
Do not handle neodymium magnets in a way in which neodymium magnet powder is generated, such as by
causing friction. Neodymium magnet powder has a risk of being ignited.
When handling cut pieces or ground powder generated when cutting neodymium magnets, note the following
reminders. Neodymium magnet powder contained in cut pieces or ground powder may have a risk of
spontaneous combustion.
(1) Keep fire, flammables, organic solvents, etc., away.
(2) Do not vacuum magnet powder with a vacuum cleaner.
(3) Prepare a dry chemical fire extinguisher or sand in case ignition occurs.
(4) Do not leave cut pieces or ground powder exposed to air, but keep them immersed at all times in a container
filled with water.
Contact us concerning the disposal of stored cut pieces or ground powder.

For
ForOur
OurCustomers
Customers
When using magnets, please sufficiently discuss matters in advance with the related departments of our company.
In addition, please consult with us when you wish to change the application or assembly method following
discussions with the related departments of our company.
We wish to prevent any safety issues caused by magnet usage methods or magnet application designs through
detailed advance discussions with our customers.

The details can be found by referring to the appended individual delivery specifications. magnet_neo_summary_en/20170301
All specifications are subject to change without notice.

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