| http://www.w3.org/ns/prov#value | - A second magnetic nano-oxide layer (170) is formed on the spacer layer, said nano-oxide layer being formed of material such as Fe3O4 or CrO2, surface oxidations of NiFe or CoFe, CoFeNi based spinel structures, ferrimagnetic garnets, manganites or other ferromagnetic perovskites, or ferromagnetic nitrides and being formed to a thickness of between 0.4 nm and 6.0 nm.
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