Application Notes
Magnetic Reference Information
Permanent Magnets
The Magnetic Materials Producers Association (MMPA) publishes two reference booklets with
valuable reference information on basic magnetic theory, permanent magnet materials and their
practical application. They are:
MMPA Standard no. 0100-96
Standard Specifications for Permanent Magnet Materials
MMPA PMG-88
Permanent Magnet Guidelines
These booklets can be obtained from the MMPA:
Magnetic Materials Producers Association
8 South Michigan Ave., Suite 1000
Chicago, IL 60603
(312) 456-5590
(312) 580-0165 (fax)
Measurement Systems
lines/in
Unit
Length
Flux
Flux density
Magnetizing force
Magnetomotive force
Symbol
L
φ
B
H
F
cgs System
centimeter (cm)
maxwell
gauss (G)
oersted (Oe)
gilbert (Gb)
SI System
meter (m)
weber (Wb)
tesla (T)
ampere turns/m (At/m)
ampere turn (At)
English System
inch (in)
maxwell
2
ampere turns/in (At/in)
ampere turn (At)
Permeability in air
μ 0
1
4 π x 10
-7
3.192
Conversion factors for between measurement systems can be found in the appendix to this catalog.
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