title: Electrical control of large magnetization reversal in a helimagnet.
abstract: Reversal of magnetization M by an electrical field E has been a long-sought phenomenon in materials science because of its potential for applications such as memory devices. However, the phenomenon has rarely been achieved and remains a considerable challenge. Here we report the large M reversal by E in a multiferroic Ba0.5Sr1.5Zn2(Fe0.92Al0.08)12O22 crystal without any external magnetic field. Upon sweeping E through the range of ±2 MV m(-1), M varied quasi-linearly in the range of ±2 μB per f.u., resulting in the M reversal. Strong electrical modulation of M at zero magnetic field were observable up to ~\n150 K. Nuclear magnetic resonance measurements provided microscopic evidence that the electric field and the magnetic field play equivalent roles in modulating the volume of magnetic domains. Our results suggest that the soft ferrimagnetism and the associated transverse conical state are key ingredients to achieve the large magnetization reversal at fairly high temperatures.
authors: 1] Center for Novel States of Complex Material Research (CeNSCMR), Department of Physics and Astronomy, Seoul National University, Seoul 151-747, South Korea [2].
authors: Yi Sheng
authors: YS
authors: Chai
authors: 1] Department of Physics, KAIST, Daejeon 305-701, South Korea [2].
authors: Sangil
authors: S
authors: Kwon
authors: Center for Novel States of Complex Material Research (CeNSCMR), Department of Physics and Astronomy, Seoul National University, Seoul 151-747, South Korea.
authors: Sae Hwan
authors: SH
authors: Chun
authors: Center for Novel States of Complex Material Research (CeNSCMR), Department of Physics and Astronomy, Seoul National University, Seoul 151-747, South Korea.
authors: Ingyu
authors: I
authors: Kim
authors: Center for Novel States of Complex Material Research (CeNSCMR), Department of Physics and Astronomy, Seoul National University, Seoul 151-747, South Korea.
authors: Byung-Gu
authors: BG
authors: Jeon
authors: 1] Center for Novel States of Complex Material Research (CeNSCMR), Department of Physics and Astronomy, Seoul National University, Seoul 151-747, South Korea [2] Institute of Applied Physics, Seoul National University, Seoul 151-747, South Korea.
authors: Kee Hoon
authors: KH
authors: Kim
authors: Department of Physics, KAIST, Daejeon 305-701, South Korea.
authors: Soonchil
authors: S
authors: Lee