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Properties of Soft Magnetic Materials

Magnetics(tm) company ferrite image - RF CafeAfter recently reading a few articles on ferromagnetic materials for both power supply and RF balun use, I did a little research to find some good sources for information. This table of parameters on common soft magnetic materials is derived from a page in a whitepaper on the Magnetics website. The paper contrasts properties of powdered magnetics, which are composed almost totally of ferrous metal (iron, nickel, cobalt, manganese, et al), versus ferrites, which are a mix of ferrous metal and oxides.

The following table of data listing properties of soft magnetic materials was derived from a "A Critical Comparison of Ferrites with Other Magnetic Materials," on the Magnetics™ website.

Definitions of parameters are as follows:

  • Initial Permeability:  ratio between the field B (induction) and the field H (A/m during magnetization) measured when
               the field H is close to zero.
  • Bmax:  Saturation Flux Density = maximum flux density that a magnetic material can accommodate; beyond
               Bmax, further increases in H result in no significant increase in B.
  • Loss Coefficients:  e = eddy current,  a = hysteresis coefficient,  c = residual loss
  • Curie Temperature:  temperature at which a ferromagnetic material loses its ferromagnetism and becomes
               paramagnetic e approaches 1).
  • μ0 x Q:  figure of merit (product of μ and Q) for linear core materials. At frequencies of 100 kHz and above,
               the value for ferrites is considerably above all other materials.


Material
Initial
Perm.
0)

Bmax
kGauss
Loss CoefficientsCurie
Temp
°C

Resistivity
(ohm-cm)
μ0 x Q
@
100 kHz

Operating
Frequencies
e x 106a x 103c x 103
Fe25022---77010 · 10-6-60-1,000 Hz
Si-Fe (unoriented)400208701207574050 · 10-6-60-1,000 Hz
Si-Fe (oriented)150020---74050 · 10-6-60-1,000 Hz
50-50 Ni Fe (grain-oriented)200016---36040 · 10-6-60-1,000 Hz
79 Permalloy12000
to
100000
8
to
11
173--45055 · 10-68000
to
12000
1 kHz
to
75 kHz
Amorphous Alloy B3,00015-16---370135 · 10-6-to 250 kHz
Amorphous Alloy E20,0005-6.5---205140 · 10-6-to 250 kHz
Permalloy powder14
to
550
30.01
to
0.04
0.0020.05
to
0.1
45011000010 kHz
to
1 MHz
High Flux powder14
to
160
15---360--10 kHz
to
1 MHz
Kool Mu powder26
to
125
10---740--to 10 MHz
Iron powder5
to
80
100.002
to
0.04
0.002
to
0.4
0.2
to
1.4
7701042000
to
30000
100 kHz
to
100 MHz
Ferrite-MnZn750
to
15000
3
to
5
0.0010.0020.01100
to
300
10
to
100
100000
to
500000
10 kHz
to
2 MHz
Ferrite-NiZn10
to
1500
3
to
5
---150
to
450
10630000200 kHz
to
100 MHz
Co-Fe 50%80024---98070 · 10-6--
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    BSEE - KB3UON

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