Giant magnetoelectric effects achieved by tuning spin cone symmetry in Y-type hexaferrites

Kun Zhai, Yan Wu, Shipeng Shen, Wei Tian, Huibo Cao (), Yisheng Chai, Bryan C. Chakoumakos, Dashan Shang, Liqin Yan, Fangwei Wang and Young Sun ()
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Kun Zhai: Institute of Physics, Chinese Academy of Sciences
Yan Wu: Oak Ridge National Laboratory
Shipeng Shen: Institute of Physics, Chinese Academy of Sciences
Wei Tian: Oak Ridge National Laboratory
Huibo Cao: Oak Ridge National Laboratory
Yisheng Chai: Institute of Physics, Chinese Academy of Sciences
Bryan C. Chakoumakos: Oak Ridge National Laboratory
Dashan Shang: Institute of Physics, Chinese Academy of Sciences
Liqin Yan: Institute of Physics, Chinese Academy of Sciences
Fangwei Wang: Institute of Physics, Chinese Academy of Sciences
Young Sun: Institute of Physics, Chinese Academy of Sciences

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Multiferroics materials, which exhibit coupled magnetic and ferroelectric properties, have attracted tremendous research interest because of their potential in constructing next-generation multifunctional devices. The application of single-phase multiferroics is currently limited by their usually small magnetoelectric effects. Here, we report the realization of giant magnetoelectric effects in a Y-type hexaferrite Ba0.4Sr1.6Mg2Fe12O22 single crystal, which exhibits record-breaking direct and converse magnetoelectric coefficients and a large electric-field-reversed magnetization. We have uncovered the origin of the giant magnetoelectric effects by a systematic study in the Ba2-x Sr x Mg2Fe12O22 family with magnetization, ferroelectricity and neutron diffraction measurements. With the transverse spin cone symmetry restricted to be two-fold, the one-step sharp magnetization reversal is realized and giant magnetoelectric coefficients are achieved. Our study reveals that tuning magnetic symmetry is an effective route to enhance the magnetoelectric effects also in multiferroic hexaferrites.

Date: 2017
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DOI: 10.1038/s41467-017-00637-x

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