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 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.
Chun
Sae Hwan
SH
FPRD, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, South Korea.
Chai
Yi Sheng
YS
Oh
Yoon Seok
YS
Jaiswal-Nagar
Deepshikha
D
Haam
So Young
SY
Kim
Ingyu
I
Lee
Bumsung
B
Nam
Dong Hak
DH
Ko
Kyung-Tae
KT
Park
Jae-Hoon
JH
Chung
Jae-Ho
JH
Kim
Kee Hoon
KH