Alnico Magnets #alnico #pot #magnets A high working temperature limit (550°C/1020°F) makes Alnico especially well-suited for sensitive automotive and aircraft sensor applications. Alnico is produced in many grades to fit the requirements of these applications, from Alnico 1 to Alnico 12, but the most popular grades are 2, 5 and 8. By comparison to the newer materials, the coercivity of Alnico is low.
The Specification of Alnico Magnets
Grade Equivalent MMPA Class Br Hcb BH(max) WT Remark
mT Gs kA/m Oe kJ/m³ MGOe °C
LN10 ALNICO3 600 6000 40 500 10 1.2 450 Isotropic
LN13 ALNICO2 700 7000 48 600 12.8 1.6 450
LNGT18 ALNICO8 580 5800 100 1250 18 2.2 550
LNG37 ALNICO5 1200 12000 48 600 37 4.65 525 Anisotropic
LNG40 1250 12500 48 600 40 5
LNG44 1250 12500 52 650 44 5.5
LNG52 ALNICO5DG 1300 13000 56 700 52 6.5
LNG60 ALNICO5-7 1350 13500 59 740 60 7.5
LNGT28 ALNICO6 1000 10500 57.6 720 28 3.5 525
LNGT36J ALNICO8HC 700 7000 140 1750 36 4.5 550
LNGT38 ALNICO8 800 8000 110 1380 38 4.75 550
LNGT40 820 8200 110 1380 40 5 550
LNGT60 ALNICO9 950 9500 110 1380 60 7.5 550
LNGT72 1050 10500 112 1400 72 9 550
Where Alnico is appropriate, magnet size can be minimized if it can be magnetized after assembly into the magnetic circuit. If used independently of other circuit components, as in security applications, the effective length-to-diameter ratio (related to the permeance coefficient) must be great enough to cause the magnet to work above the knee in its second quadrant demagnetization curve. For critical applications, Alnico magnets may be calibrated to an established reference flux density value. However, a result of low coercivity is sensitivity to demagnetizing effects due to external magnetic fields, shock, and application temperatures. For critical applications, Alnico magnets can be temperature-stabilized to minimize these effects.



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