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Realization of Giant Magnetoelectricity in Helimagnets

Authors
Chun, Sae HwanChai, Yi ShengOh, Yoon SeokJaiswal-Nagar, DeepshikhaHaam, So YoungKim, IngyuLee, BumsungNam, Dong HakKo, Kyung-TaePark, Jae-HoonChung, Jae-HoKim, Kee Hoon
Issue Date
22-Jan-2010
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v.104, no.3
Indexed
SCIE
SCOPUS
Journal Title
PHYSICAL REVIEW LETTERS
Volume
104
Number
3
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/117143
DOI
10.1103/PhysRevLett.104.037204
ISSN
0031-9007
Abstract
We show that low field magnetoelectric (ME) properties of helimagnets Ba0.5Sr1.5Zn2(Fe1-xAlx)(12)O-22 can be efficiently tailored by the Al-substitution level. As x increases, the critical magnetic field for switching electric polarization is systematically reduced from similar to 1 T down to similar 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 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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