| Stan Zurek, Non-magnetic materials, Encyclopedia Magnetica,
Non-magnetic materials - in a common language, “non-magnetic” are those materials which do not exhibit strong magnetic response - they have low relative permeability μr, very close to unity, or susceptibility close to zero (similar to vacuum).1)
In engineering applications the permeability of such materials is typically assumed to be unity (same as vacuum), with negligible error.2) Diamagnets, paramagnets and antiferromagnets are utilised for their lack of magnetic response (non-magnetic). Antiferromagnets are used in some magnetic sensors such as spin valves for their magnetic properties.
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Only three elements are ferromagnetic at room temperature: iron, cobalt, and nickel. Further six are ferromagnetic at lower and very low temperatures: gadolinium, terbium, dysprosium, holmium, erbium, and thulium.
The rest exhibit either diamagnetic or paramagnetic properties (antiferromagnets are macroscopically indistinguishable from paramagnets).
It is also possible for a combination of non-magnetic elements to exhibit magnetic behaviour, as it is the case for example for Heusler alloys, for example Cu2MnSn, Cu2MnAl, or Pd2MnAl.4) However, these materials are not used in industrial applications.