Realization of giant magnetoelectricity in helimagnets

We show that low field magnetoelectric (ME) properties of helimagnets Ba0.5Sr1.5Zn2(Fe1-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 approximately 1 T down to approx...

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Bibliographic Details
Published in:	Physical review letters Vol. 104; no. 3; p. 037204
Main Authors:	Chun, Sae Hwan, Chai, Yi Sheng, Oh, Yoon Seok, Jaiswal-Nagar, Deepshikha, Haam, So Young, Kim, Ingyu, Lee, Bumsung, Nam, Dong Hak, Ko, Kyung-Tae, Park, Jae-Hoon, Chung, Jae-Ho, Kim, Kee Hoon
Format:	Journal Article
Language:	English
Published:	United States 22-01-2010
Online Access:	Get full text
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Summary:	We show that low field magnetoelectric (ME) properties of helimagnets Ba0.5Sr1.5Zn2(Fe1-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 approximately 1 T down to approximately 1 mT, and the ME susceptibility is greatly enhanced to reach a giant value of 2.0x10{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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0031-9007 1079-7114
DOI:	10.1103/physrevlett.104.037204