Abstract
Interlayer exchange coupling in polycrystalline Co2FeAl/Cr/Co2FeAl multilayers with Ta and MgO capping layers is investigated. Compared with Ta‐capped samples, the MgO capping layer induces the oscillatory coupling periods, ≈2.1 nm for Si substrate and ≈4.0 and ≈1.9 nm for SiO2 substrate. The oscillatory coupling period originates from the formation of quantum well states at the Cr/Co2FeAl interface due to the MgO capping layer. Meanwhile, Δ1 Bloch state in the majority spin and Δ2' Bloch state in the minority spin contribute to the short (≈2.1 and ≈1.9 nm) and long oscillatory period (≈4.0 nm) in the disordered B2 Co2FeAl multilayers, respectively.
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