We investigate the magnetic properties of MgO/(Co1-xFex)75B25/MgO trilayers with Fe composition x varied from 0.5 to 1.0 and properties of magnetic tunnel junction (MTJ) with this structure as a free layer. The interfacial and bulk anisotropy energy densities increase, and the damping constant α decreases, with increasing x. For MTJs made with this structure as the free layer, the coercive field and thermal stability factor Δ both increase with increasing x. Higher switching efficiency, defined as the ratio of Δ to intrinsic critical current, is expected for devices with higher Fe composition owing to the smaller α.
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Bersweiler et al. (2017) studied this question.
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