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Interfaces in FeCoB/MgO/FeCoB magnetic tunnel junction play a vital role incontrolling their magnetic and transport properties for various applications inspintronics and magnetic recording media. In this work, interface structures ofa few nm thick FeCoB layers in FeCoB/MgO and MgO/FeCoB bilayers arecomprehensively studied using x-ray standing waves (XSW) generated bydepositing bilayers between Pt waveguide structures. High interface selectivityof nuclear resonance scattering (NRS) under the XSW technique allowed measuringstructure and magnetism at the two interfaces, namely FeCoB-on-MgO andMgO-on-FeCoB, yielding an interesting result that electron density andhyperfine fields are not symmetric at both interfaces. The formation of ahigh-density FeCoB layer at the MgO/FeCoB (FeCoB-on-MgO) interface with anincreased hyperfine field (~34.65 T) is attributed to the increasing volume ofFeCo at the interface due to boron diffusion from 57FeCoB to the MgO layer.Furthermore, it caused unusual angular-dependent magnetic properties inMgO/FeCoB bilayer, whereas FeCoB/MgO is magnetically isotropic. In contrast tothe literature, where the unusual angular dependent in FeCoB based system isexplained in terms of in-plane magnetic anisotropy, present findings attributedthe same to the interlayer exchange coupling between bulk and interface layerwithin the FeCoB layer.

Asymmetric magnetism at the interfaces of MgO/FeCoB bilayers by exchanging the order of MgO and FeCoB