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arXiv:1001.1226 [cond-mat.mtrl-sci]AbstractReferencesReviewsResources

Realization of giant magnetoelectricity in helimagnets

Sae Hwan Chun, Yi Sheng Chai, Yoon Seok Oh, Deepshikha Jaiswal-Nagar, So Young Haam, Ingyu Kim, Bumsung Lee, Dong Hak Nam, Kyung-Tae Ko, Jae-Hoon Park, Jae-Ho Chung, Kee Hoon Kim

Published 2010-01-08, updated 2010-01-21Version 2

We show that low field magnetoelectric (ME) properties of helimagnets Ba0.5Sr1.5Zn2(Fe1-xAlx)12O22 can be efficiently tailored by 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 x 10^4 ps/m at an optimum x = 0.08. We find that control of nontrivial orbital moment in the octahedral Fe sites through the Al-substitution is crucial for fine tuning of magnetic anisotropy and obtaining the conspicuously improved ME characteristics.

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