China Neodymium And Ferrite Magnets Manufacturer & Supplier 
Definition of metal permanent magnetic materials: Metal permanent magnetic materials are permanent magnetic materials with iron and iron group elements (such as nickel, put, etc.) as the main group elements. Its main characteristics are high Curie temperature, high residual magnetic induction strength and high saturation magnetic induction strength, and no rare earth elements.
Metal permanent magnetic materials are mainly aluminum-nickel-cobalt permanent magnetic alloy (Al-NiCo), ferrochrome-cobalt permanent magnetic alloy (Fe-Cr-Co) and platinum-cobalt alloy (PtCO), etc. The development of metal permanent magnetic materials began in the early 20th century, and was more applied in the 1930s to 1960s. With the discovery of high-performance rare-earth permanent magnetic materials in the early 1970s, the application of metal permanent magnetic materials has been greatly impacted and gradually replaced by new permanent magnetic materials, which are currently only used in niche special fields.
Alnico, FeCrCo, PtCo metal permanent magnet materials introduction
Alnico permanent magnet alloy
Alnico permanent magnet alloy (Alnico) appeared in the 1930s, is a kind of permanent magnet alloy with good magnetic stability developed on the basis of Fe2AINi alloy, adding Co adjustment components and improving the process. Alnico alloys are divided into two classes, cast Alnico permanent magnets and bonded Alnico permanent magnets.
View Alnico magnets: https://www.couragemagnet.com/aluminum-nickel-cobalt-magnets/
FeCrCo Permanent Magnetic Alloy
In the early 1970s, Hideo Kaneko and others from Tohoku University in Japan invented Fe-CR-CO permanent magnet alloy by adding Co or Mo to promote the decomposition reaction of a phase in Fe-Cr alloy. Fe-Cr-Co permanent magnet alloy is a deformed permanent magnet alloy, which can be processed by traditional metallurgy and machining technology to make it into the shape of the required material.
Take a look at the ferrochrome cobalt magnet: https://www.couragemagnet.com/iron-chromium-cobalt-magnets/
Platinum-cobalt alloy
Platinum-cobalt alloy (PtCO) has high coercivity and magnetic energy product, good magnetic stability, corrosion resistance, can be in the acid, alkali, salt media work, because of its expensive, so it is mainly used for other permanent magnetic materials can not work in the harsh, special environments, such as aviation, navigation, aerospace and other fields.
At present, the metal permanent magnet materials have not completely withdrawn from the market, the production of magnets manufacturers are very few, the scale of production has been completely unable to compete with the ferrite permanent magnets and rare earth magnets.
Introduction of related magnet materials;
Magnetic Field Strength vs. Material Type
Can SmFeN Materials Replace Neodymium?