GM412A
Magnetic properties of toroidal boxed magnetic cores from amorphous and nanocrystalline alloys
GAMMAMET® 412A
Magnetic cores GAMMAMET 412A are made of a ribbon by thickness 25 microns with nanocrystalline structure. The ribbon is produce by means of fast incandescence from an alloy on the basis of iron. After thermal processing in a longitudinal magnetic field magnetic cores have high rectangular loop of a magnetic hysteresis and low coercive force.
Magnetic cores may be produced with any standard sizes with external diameter up to 600 mm, with internal diameter not less than 8 mm, proportional 5 mm at height and are delivered in protective containers.
Sizes list of magnetic cores in protective containers you can see in Table 1. Weight and geometrical sizes of toroidal boxed magnetic cores
All magnetic cores have a class of thermal stability A (105°C). At will of the customer also magnetic cores may be produced with class F (155°C).
Full service life of magnetic cores - 30 years.
Magnetic cores GAMMAMET® 412А replace soft magnetic alloys Fe- and Ni- alloys and ferrite with a rectangular loop of a magnetic hysteresis. Next table of magnetic parameters is agreed with specifications ТУ 1261-030-12287107-2007:
| Magnetic core | Squareness ratio Kp10, not less | Coercive force, A/m, not more | B800, T, not less |
|---|---|---|---|
| GM 412А | 0,85 | 2,0 | 1,15 |
Use area: magnetic amplifiers, pulse transformers, magnetic keys.
GAMMAMET® owns following patents of Russia which are used at manufacture of magnetic cores GM412А: 2009257, 2009258, 2033649, 2117714.
The detailed information about magnetic properties of GM412А can be found in the book: Starodubtsev J.N., Belozerov V.J. "Magnetic properties amorphous and nanocrystalline alloys"
| Magnetic induction, В800 | 1,15 T |
|---|---|
| Maximum permeability | 200000 |
| Coercive force | 4 A/m |
| Squareness ratio Br/B800 | 0,9 |
| Saturation magnetostriction | 25×10-6 |
| Specific electroresistance | 1,3×10-6 Оm×m |
| Density | 7300 kg/m3 |
| Curie temperature | 420°C |
| Specific magnetic losses at frequency 3<f<200 kHz | |
| P = 2×10-4f1,4Bm1,65 (W/kg3) | |
| Specific magnetic losses at frequency 3<f<200 kHz | |
| P = 2,8×10-4f1,5Bm1,85 (W/kg); Bm≤0,1 T | |
| P = 10-4f1,5Bm1,4 (W/kg); Bm>0,1 T | |
| f – frequency (Hz), Вm – maximum magnetic induction (T) | |
Loop of a magnetic hysteresis
Curves of magnetization
By digits on curves designate frequency in kHz. The curve f = 0 corresponds to the basic curve of magnetization
Magnetic permeability
For fixed maximal magnetic induction
