Ferrite Magnets

Overview

Because these are oxide magnets produced by the powder metallurgy method, their residual magnetic flux density is relatively low, but they have the major advantage of high coercive force and are therefore not easily affected by the presence of demagnetizing fields.

Positioning of Ferrite Magnets

Ferrite magnets use a wide range of materials with special properties. Especially at the high end of the performance spectrum, our magnet series are suitable for all kinds of applications.
HCJ and Br correlations of the various materials are shown in Figure 1.
Ferrite magnets may be customized upon request, within the indicated range of HCJ and Br characteristics.

In the interests of thorough quality control in each process, we have adopted measuring methods of the Magnetic Materials Producers Association (MMPA) of the United States and the Japanese Industrial Standard (JIS) for magnetic characteristics.

Features

High-Performance Ferrite Magnets NMF™ Series

Magnetic Characteristics

Material code Remanence
Br
Coercivity Maximum energy product
(BH)max
HCB HCJ
(mT) (kG) (kA/m) (kOe) (kA/m) (kOe) (kJ/m³) (MGOe)
NMF-15G 470-490 4.7-4.9 342-382 4.3-4.8 ≧382 ≧4.8 41.4-44.6 5.2-5.6
NMF-15J 460-480 4.6-4.8 342-382 4.3-4.8 ≧440 ≧5.5 39.7-43.0 5.0-5.4
NMF-12E 460-480 4.6-4.8 294-334 3.7-4.2 ≧310 ≧3.9 39.7-43.0 5.0-5.4
NMF-12F 450-470 4.5-4.7 318-358 4.0-4.5 ≧342 ≧4.3 38.2-41.4 4.8-5.2
NMF-12G+ 450-470 4.5-4.7 318-358 4.0-4.5 ≧382 ≧4.8 38.2-41.4 4.8-5.2
NMF-12G 440-460 4.4-4.6 310-350 3.9-4.4 ≧382 ≧4.8 36.6-39.8 4.6-5.0
NMF-12J 430-460 4.3-4.6 300-350 3.8-4.4 ≧430 ≧5.4 35.0-39.8 4.4-5.0
NMF-12K 420-440 4.2-4.4 300-350 3.8-4.4 ≧462 ≧5.8 33.4-36.6 4.2-4.6
NMF-9D 440-460 4.4-4.6 262-302 3.3-3.8 ≧286 ≧3.6 36.6-39.7 4.6-5.0
NMF-9E 430-450 4.3-4.5 310-350 3.9-4.4 ≧334 ≧4.2 35.0-38.1 4.4-4.8
NMF-9F 420-440 4.2-4.4 302-342 3.8-4.3 ≧374 ≧4.7 33.4-36.6 4.2-4.6
NMF-9G 410-430 4.1-4.3 294-334 3.7-4.2 ≧398 ≧5.0 31.8-35.0 4.0-4.4
NMF-7C 430-450 4.3-4.5 222-262 2.8-3.3 ≧230 ≧2.9 35.0-38.1 4.4-4.8
NMF-7D 420-440 4.2-4.4 254-294 3.2-3.7 ≧270 ≧3.4 33.4-36.6 4.2-4.6
NMF-7E 410-430 4.1-4.3 286-326 3.6-4.1 ≧310 ≧3.9 31.8-35.0 4.0-4.4
NMF-7F 400-420 4.0-4.2 278-318 3.5-4.0 ≧342 ≧4.3 30.2-33.4 3.8-4.2
NMF-7G 390-410 3.9-4.1 270-310 3.4-3.9 ≧382 ≧4.8 28.6-31.8 3.6-4.0
NMF-6C 420-440 4.2-4.4 230-262 2.9-3.3 ≧230 ≧2.9 33.4-36.6 4.2-4.6
NMF-6D 410-430 4.1-4.3 246-286 3.1-3.6 ≧270 ≧3.4 31.8-35.0 4.0-4.4
NMF-6E 400-420 4.0-4.2 278-318 3.5-4.0 ≧310 ≧3.9 30.2-33.4 3.8-4.2
NMF-6F 390-410 3.9-4.1 270-310 3.4-3.9 ≧342 ≧4.3 28.6-31.8 3.6-4.0
NMF-6G 380-400 3.8-4.0 262-302 3.3-3.8 ≧382 ≧4.8 27.0-30.2 3.4-3.8
NMF-5C 410-430 4.1-4.3 215-254 2.7-3.2 ≧230 ≧2.9 31.8-35.0 4.0-4.4
NMF-5D 400-420 4.0-4.2 254-294 3.2-3.7 ≧270 ≧3.4 30.2-33.4 3.8-4.2
NMF-5E 390-410 3.9-4.1 278-318 3.5-4.0 ≧310 ≧3.9 28.6-31.8 3.6-4.0
NMF-5F 380-400 3.8-4.0 270-310 3.4-3.9 ≧342 ≧4.3 27.0-30.2 3.4-3.8
NMF-5G 370-390 3.7-3.9 262-302 3.3-3.8 ≧382 ≧4.8 25.4-28.6 3.2-3.6
NMF-3B 400-420 4.0-4.2 175-215 2.2-2.7 ≧190 ≧2.4 30.2-33.4 3.8-4.2
NMF-3C 390-410 3.9-4.1 215-254 2.7-3.2 ≧230 ≧2.9 28.6-31.8 3.6-4.0
NMF-3D 380-400 3.8-4.0 246-286 3.1-3.6 ≧270 ≧3.4 27.0-30.2 3.4-3.8
NMF-3E 370-390 3.7-3.9 254-294 3.2-3.7 ≧310 ≧3.9 25.4-28.6 3.2-3.6
NMF-3F 360-380 3.6-3.8 246-286 3.1-3.6 ≧342 ≧4.3 23.8-27.0 3.0-3.4
NMF-3G 350-370 3.5-3.7 238-278 3.0-3.5 ≧382 ≧4.8 22.2-25.4 2.8-3.2
NMF-D2 360-390 3.6-3.9 222-263 2.8-3.3 ≧230 ≧2.9 23.8-28.7 3.0-3.6
NMF-D5 400-420 4.0-4.2 255-294 3.2-3.7 ≧270 ≧3.4 29.4-32.6 3.7-4.1
NMF-D6 410-430 4.1-4.3 255-294 3.2-3.7 ≧270 ≧3.4 30.2-33.4 3.8-4.2
NMF-D9 420-440 4.2-4.4 278-318 3.5-4.0 ≧342 ≧4.3 32.6-35.8 4.1-4.5
NMF-D11 440-460 4.4-4.6 278-318 3.5-4.0 ≧342 ≧4.3 35.1-38.2 4.4-4.8

* Actual magnetic properties may be different from the ones shown above, depending on shape, size and manufacturing conditions.
Please contact your sales representative about other grades.

Ferrite Anisotropic Ring Magnets

Ferrite Anisotropic Multi-Pole Ring Magnets

Types Dry-pressing Wet-pressing
Material NMF-DM1
NMF-DM2
NMF-DM3
NMF-WM2
NMF-WM3
NMF-WM4
OD(mm) φ10~φ56 φ10~φ30

Number of Poles *


Orientation

* On characteristics not listed on above table, please contact your sales representative.

Magnetic Characteristics

Material code Remanence
Br
Coercivity
HCJ
(mT) (kA/m) (kOe)
NMF-DM1 340 ≧263 ≧3.3
NMF-DM2 360 ≧302 ≧3.8
NMF-DM3 380 ≧326 ≧4.1
NMF-WM1 250 ≧239 ≧3.0
NMF-WM2 350 ≧263 ≧3.3
NMF-WM3 370 ≧302 ≧3.8
NMF-WM4 390 ≧326 ≧4.1

* Above numbers show material characteristics because B-H curves of actual multi-pole anisotropic magnets cannot be measured.

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Demagnetization Curve (PDF file)

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