Magnet-ABC / Glossary


Anisotropic Magnets

In the production process, a preferential direction is applied to anisotropic magnets by using an external magnetic field. In a magnetizing process following later, the maximum magnetic values are obtained in this direction.

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Coercive Field Force Hc

There is distinction between the coercive field force BHc, the flux density, and the coercive field force IHc of the polarisation. The coercive field force BHc (in the case of the closed magnetic circle) is defined as demagnetized field strength required for the removal of the flux density B. The coercive field force IHc is the demagnetized field strength whereby the polarisation I becomes zero. Thus, by applying IHc, a body becomes non-magnetic. Practically speaking, all materials with high permeability are magnetic, mainly iron, nickel, cobalt, and their alloys. All other materials are non-magnetic (brass, copper, wood, stone etc.).

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Demagnetizing Curve

Part of the hysterisis loop within the second quadrant of the coordinate system (B respectively M positive, H negative). By measuring the demagnetizing curve, the most important magnetic features are determined.

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Energy Product (B x H)

Product of flux density B and field strength H in the second quadrant of the demagnetizing- curve. The energy product has a maximum (BH)max between the points Br and BHc. The maximum energy product may be defined as maximum stored magnetic energy and serves as material constant when assessing permanent magnetic components (see fig. 1).

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Field Strength (magnetic) H

Signifies value and direction of a magnetic field may be defined in various ways. For example: The potential energy of a small permanent magnet with magnetic moment m within the magnetic field H is provided by:

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Flux (magnetic)

Product from flux density B x area F, interspersed by the magnetic field. Unit: 1 Vs = 1 Weber (Wb).

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Flux Density (magnetic) B

Describes the strength of the magnetic field as H does. Whereas, outside magnetizable matter, B and H differ only by a constant factor, B accounts for the influence of the magnetisation within such materials.

Unit: 1 Vs/m² = Wb/m² = 104 G = 1 T
Most common are the units
1 T = 104 G und 1 mT = 10 G

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Gauss

Formerly common unit of the magnetic flux density.

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Isotropic Magnets

Isotropic magnets may be magnetized in all directions with the identical magnetic features.

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Magnetic characteristics of magnetic foils/ magnetic strips
Qualität Br bHc iHc Bhmax max. Arbeitstemperatur Dichte Temperatur-Koeffizient Temperatur-Koeffizient Curie Temperatur
mT
kG
kA/m
KOe
kA/m
KOe
kJ/m³
MGOe
°C g/cm³
%/°C %/°C °C
Permaflex® isotrop 163 1,63 110 1,4 240 3,0 4,5 0,57 70 3,6 -0,20/td> -0,35 450
Permaflex® anisotrop 220 2,20 170 2,1 280 3,5 9 1,13 70 3,6 -0,20/td> -0,35 450
Permadym® 4800 4,80 294 3,7 636 8,0 51 6,5 70 5,3 -0,11/td> -0,65 310
Magnetic characteristics of sintered hard-ferrites
Qualität Br bHc iHc Bhmax max. Arbeitstemperatur Dichte Temperatur-Koeffizient Temperatur-Koeffizient Curie Temperatur
mT
kG
kA/m
KOe
kA/m
KOe
kJ/m³
MGOe
°C g/cm³
%/°C %/°C °C
OXI 100 200 2,00 125 1,57 210 2,64 6,5 0,80 250 4,5 -0,2/td> -0,5 450
OXI 300 350 3,50 228 2,85 235 2,93 24 3,02 250 4,8 -0,2/td> -0,35 450
OXI 340 365 3,65 230 2,87 235 2,93 26 3,39 250 4,8 -0,2/td> -0,35 450
OXI 340H 380 3,80 275 4,37 300 3,75 27 3,40 250 4,8 -0,2/td> -0,35 450
OXI 400 395 3,95 265 3,31 270 3,37 31 3,90 250 4,8 -0,2/td> -0,35 450
Magnetic characteristics of neodymium-iron-boron magnets (NdFeB)
Qualität Br bHc iHc Bhmax max. Arbeitstemperatur Dichte Temperatur-Koeffizient Temperatur-Koeffizient Curie Temperatur
mT
kG
kA/m
KOe
kA/m
KOe
kJ/m³
MGOe
°C g/cm³
%/°C %/°C °C
N35 1180 11,80 860 10,8 955 12 267 33,5 80 7,45 -0,11 -0,85 320
N42 1300 13,00 876 11,0 955 12 323 40,5 80 7,45 -0,11 -0,85 320
N48 1380 13,80 891 11,2 955 12 366 46 80 7,45 -0,11 -0,85 320
N55 1460 14,60 716 9,0 876 11 414 52 80 7,45 -0,11 -0,85 320
N35M 1180 11,80 860 10,8 1114 14 267 33,5 100 7,45 -0,11 -0,80 320
N42M 1300 13,00 955 12,0 1114 14 323 40,5 100 7,45 -0,11 -0,80 320
N35H 1180 11,80 876 11,0 1353 17 267 33,5 120 7,55 -0,12 -0,75 350
N42H 1300 13,00 979 12,3 1353 17 323 40,5 120 7,55 -0,12 -0,75 350
N50H 1390 13,90 1035 13,0 1274 16 374 47 120 7,55 -0,12 -0,75 350
N35SH 1180 11,80 876 11,0 1592 20 267 33,5 150 7,55 -0,11 -0,60 380
N42SH 1300 13,00 995 12,5 1592 20 323 40,5 150 7,55 -0,11 -0,60 380
N48SH 1360 13,60 995 12,5 1512 19 358 45 150 7,55 -0,11 -0,60 380
N35UH 1180 11,80 876 11,0 1990 25 267 33,5 180 7,55 -0,10 -0,55 380
N42UH 1270 12,70 971 12,2 1990 25 310 39 180 7,55 -0,10 -0,55 380
N38EH 1220 12,20 899 11,3 2388 30 291 36,5 200 7,55 -0,09 -0,50 380
N33AH 1140 11,40 844 10,6 2786 35 251 31,5 220 7,55 -0,08 -0,45 380
Magnetic characteristics of magnetic foils/ magnetic strips
Qualität Br bHc iHc Bhmax max. Arbeitstemperatur Dichte Temperatur-Koeffizient Temperatur-Koeffizient Curie Temperatur
mT
kG
kA/m
KOe
kA/m
KOe
kJ/m³
MGOe
°C g/cm³
%/°C %/°C °C
SmCo5-18 850 8,50 660 8,3 1194 15 127 16 250 8,3 -0,05 -0,03 750
SmCo5-20 900 9,00 680 8,5 1194 15 150 19 250 8,3 -0,05 -0,03 750
Sm2Co17-26 1020 10,20 750 9,4 1433 18 191 24 300 8,4 -0,03 -0,02 800
Sm2Co17-28 1030 10,30 756 9,5 1433 18 207 26 300 8,4 -0,03 -0,02 800
Sm2Co17-26H 1020 10,20 750 9,4 1990 25 191 24 350 8,4 -0,03 -0,02 800
Sm2Co17-28H 1030 10,30 756 9,5 1990 25 207 26 350 8,4 -0,03 -0,02 800
Magnetizing

Process of aligning the elementary magnetic areas by an external magnetic field.

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Maxwell

Former unit for the magnetic flux.

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Oersted

Former unit for magnetic field strength.

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Quality Control

Our products are subject to a strict entry and exit control, carried out in accordance to ISO 9000 ff regulations since 1996. Currently our company is certified to ISO 9001-2008.

Certificate Register No. 052966QM, Certificate-ID 170619179

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Remanenz Br

Remanence is the induction (flux density) remaining in a ferrous magnetic material after removal of the magnetizing field. The numerical value of the remanence applies as material constant for the case of the closed circle (H = 0) and is called true remanence (Br). In the opened magnetic circuit Br drops to the value of the apparent remanence Br.

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Saturation Magnetizing

A magnetization, which can maximally be achieved by parallel alignment of all magnetic moments, is called saturation magnetization.

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Sintered Magnet

Permanent magnet pressed from a mixture of magnetizable powders and hardened by heating in a vacuum.

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Tesla

Unit for the magnetic Flux.

1 Tesla (T)= 104 G = 1 Vs/m2

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Temperature Coefficient

Indicates the dependency of the magnetic material's characteristic data Br and BHc upon temperature. The temperature coefficients for Br, respectively BHc differ.

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Type of MagnetizationWeber

Unit for the magnetic Flux.

1 weber (Wb) = 1 Vs = 108 Maxwell

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