Alnico magnets are made of an alloy of aluminum, nickel and cobalt. They are very used magnets in the industrial sector, thanks to their properties and their resistance to high temperatures. They are the magnets with more stability at extreme temperatures, for this reason we can find them inside ovens making the function of subjection or detection.


Type of material




Work temperature

From -250ºC to 425ºC


High level of magnetic induction
Stability at extreme temperatures
Outdoor application

We leave at your disposal a table that shows the characteristics of the alnico magnets. It indicates the qualities of the magnets such as: the remanence of the magnets, the coercive force, the working temperatures and the minimum and maximum resistance.


IMAGradoNomenclatura RemanenciaFuerza CoercitividadCoercitividad IntrínsicaEnergía Máxima ProductoTemperatura de Trabajo
ImamagnetsGradeNomenclatureRemanenceCoercive forceIntrinsic coerciveMaxium energy productWorking temp
Alnico MagnetsGradeNomenclatureBrFuerza bHcFuerza Ihc (BH) maxWorking temp
Alnico MagnetsGradeNomenclatureBr max (T) Br min (T) HcB min (kA/m) HcB max (kA/m) HcJ min (kA/m) HcJ max (kA/m) BHmax min (kJ/m³) BHmax max (kJ/m³) Max. Temp. trabajo: (ºC)
LNG40AlNiCo 40/0 1,23 48,00 40 550
LNG44AlNiCo 44/0 1,2552,0044550
LNG48AlNiCo 48/01,2856,0048550
LNG52AlNiCo 52/01,3056,0052550
LNGT32AlNiCo 32/00,80100,0032550
LNGT38AlNiCo 38/00,80 110,0038550
LNGT44AlNiCo 44/00,85115,0044550
LNGT48AlNiCo 48/00,90 120,0048550


The Alnico magnet is the magnetic element with the highest stability at extreme temperatures, that is, it maintains all its magnetic properties between -250ºC and 425ºC, ensuring a high thermal resistance. (In the case of neodymium magnets, the maximum working temperature is 200°C)

This alloy composed of aluminum, nickel and cobalt, has a high level of magnetic induction but a lower coercivity.

Although new stronger materials and cheaper solutions have emerged, alnico magnets continue to incorporate a special property, have a lower coercive field that enables magnetization and demagnetization, with low power.

The magnetic orientation of these products must be carried out during their heat treatment, ensuring a magnetic field with the direction of magnetization defined. The force that alnico magnets can provide is the most similar and comparable to neodymium magnets.

Another great advantage is its resistance to chemical products, such as acids or solvents, and its good oxidation behavior.

The horseshoe Alnico magnet is the best known product thanks to its design that is assigned to describe a conventional magnet.

Work temperature

The working temperature is the most significant characteristic of this type of magnets, made with Alnico.

They present a great stability to extreme temperatures, conserving all of their magnetic characteristics in a range of very extensive temperatures that ranges from -250ºC to 425ºC, reaching a Curie point of 850ºC.


Las elevadas temperaturas con las que puede trabajar los imanes de alnico, junto a la resistencia térmica y su gran fuerza, abre un gran abanico de posibilidades en diferentes sectores industriales. Being a perfect alternative to materials such as neodymium or ferrite.

Electric Motors
Electric guitar pickups
Aerospace sensors

Production process

To obtain alnico magnets we can follow two processes: casting and sintering:

  1. The phase known as weighing, in this we must make the correct composition of the magnet avoiding oxidation and impurities of the raw materials.
  2. The fusion process. Here we find the molten matter that will later be poured into a mold.
  3. Later, continuing with the melting phase, we will identify the quality of the magnet according to the level of whiteness that the magnet has
  4. Next, we will pass the magnet to heat treat it to give it future resistance to oxidation.
  5. Finally, it will be magnetized and the production process for this alnico magnet will be terminated.
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