| http://www.w3.org/ns/prov#value | - The magnetic particles can be made of any material that responds to a magnetic field, including nickel, cobalt, iron and rare earth metals such as gadolinium, terbium, dysprosium and erbium.17 The metals can be employed in any state with magnetic susceptibility, including as an alloy or an oxide.18 The most preferred metal used appears to be magnetite, i.e., Fe3O4 or iron (II, III) oxide.19 It is
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