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Mu-Metal Chemical Etching

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Mu-Metal chemical etching roll and three circular samplesMu-Metal is a Nickel-Iron soft ferromagnetic alloy designed to serve as a low-frequency magnetic shielding material. It features high permeability and is often composed of 80% Nickel, 20% Iron, and small amounts of other metals, depending on the formula and design criteria.

When an externally applied magnetic field is present, Mu-Metal domains magnetically re-align and generate a new external field. The superposition of the two fields results in a lower observed field.

Fotofab's etching process produces designs that can withstand harsh indoor and outdoor environments. The process uses an acid (Ferric Chloride) to cut into unprotected parts of a metal surface to create a design or image formed to your project’s specifications.

Fotofab proudly services the US & International customers. 

Characteristics of Mu-Metal:

Stronger than pure nickel, Monel alloys are resistant to corrosion by many agents, including rapidly flowing seawater. Other characteristics include:

  • High permeability with minimum hysteresis loss, which is ideal for a variety of magnetic shielding applications
  • Low reluctance path for magnetic flux, leading to its use in magnetic shields against static or slowly varying magnetic fields
  • Low coercivity, near zero magnetostriction, and significant anisotropic magnetoresistance, which is critical for industrial applications where variable stresses in thin films would otherwise cause a ruinously large variation in magnetic properties

Mu-Metal Etching Applications:

By varying the levels of Nickel, Iron, and other metals in Mu-Metal formulations, the alloy can exhibit differing levels of permeability and magnetic shielding properties. As a result, Mu-Metal is used in a variety of applications, including:

  • Computer terminals
  • Shields
  • Transformer magnetic core
  • Telecommunications equipment
  • Automotive instrumentation
  • Medical diagnostic equipment
  • Audio amplifiers
  • Performance venue lighting systems
  • Linear accelerators

Other Factors

  • Magnetic shielding from Mu-Metal works not by blocking magnetic fields but providing a path for the magnetic field lines around the shielded area
  • The best shape for shielding applications is a closed container surrounding the shielded space
  • The effectiveness of Mu-Metal shielding decreases with the alloy's permeability, which drops off at both low field strengths and, due to saturation, at high field strengths
  • Also known as Hy-Mu 80™ and Permalloy80™

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