We show that low field magnetoelectric (ME) properties of helimagnets Ba0.5Sr1.5Zn₂(Fe_1-xAlₓ)₁₂O₂₂ can be efficiently tailored by the Al-substitution level. As x increases, the critical magnetic field for switching electric polarization is systematically reduced from ~1 T down to ~1 mT, and the ME susceptibility is greatly enhanced to reach a giant value of 2.0×10⁴ ps/m at an optimum $x=0.08$. We find that control of the nontrivial orbital moment in the octahedral Fe sites through the Al substitution is crucial for fine-tuning the magnetic anisotropy and obtaining the conspicuously improved ME characteristics.
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Chun et al. (2010) studied this question.
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