1111.4525 (Sae Hwan Chun et al.)

Electric field control of nonvolatile four-state magnetization at room
temperature    [PDF]

Sae Hwan Chun, Yi Sheng Chai, Byung-Gu Jeon, Hyung Joon Kim, Yoon Seok Oh, Ingyu Kim, Hanbit Kim, Byeong Jo Jeon, So Young Haam, Ju-Young Park, Suk Ho Lee, Jae-Ho Chung, Jae-Hoon Park, Kee Hoon Kim

We find the realization of large converse magnetoelectric (ME) effects at room temperature in a multiferroic hexaferrite Ba$_{0.52}$Sr$_{2.48}$Co$_{2}$Fe$_{24}$O$_{41}$ single crystal, in which rapid change of electric polarization in low magnetic fields (about 5 mT) is coined to a large ME susceptibility of 3200 ps/m. The modulation of magnetization then reaches up to 0.62 $\mu$$_{B}$/f.u. in an electric field of 1.14 MV/m. We find further that four ME states induced by different ME poling exhibit unique, nonvolatile magnetization versus electric field curves, which can be approximately described by an effective free energy with a distinct set of ME coefficients.

View original: http://arxiv.org/abs/1111.4525