How is nickel used in magnetic alloys such as Permalloy?

In the context of nickel processing, nickel is a primary component of Permalloy, a group of nickel-iron alloys renowned for having significantly higher magnetic permeability than iron alone.12

The specific role of nickel in these alloys includes:

• Enhancing Permeability: By alloying nickel with iron, manufacturers can create materials that are easily magnetized in relatively small magnetic fields. The highest permeability is achieved at approximately 78.5 percent nickel content, a composition often referred to as Permalloy A.3
• Adjusting Magnetic Properties: The proportion of nickel can be varied to suit specific applications. For instance, alloys containing 35 to 90 percent nickel are used depending on the desired magnetic characteristics, with 78 percent nickel commonly used for low-power transformer cores, while 50 percent nickel alloys are utilized for high-power transformers.12
• Reducing Anisotropy: As the nickel content approaches 80 percent, the magnetocrystalline anisotropy of the alloy drops to a very low value, which contributes to the material's superior magnetic performance at low flux densities compared to pure iron or silicon-iron.3