Publication Type:Journal Article
Source:Nature Materials, Nature Publishing Group, Volume 9, Number 9, p.756-761 (2010)
Keywords:Antiferromagnetic order parameter, Conducting channels, Electric field effects, Electric fields, Electric-field control, Ferroelectric polarization, ferroelectricity, Ferromagnetic materials, Ferromagnetic orderings, Ferromagnetism, Field-effect devices, Magnetic storage, Magnetization, Magnetoelectronics, Manganese oxide, Multiferroic materials, Spin polarized currents
Electric-field control of magnetization has many potential applications in magnetic memory storage, sensors and spintronics. One approach to obtain this control is through multiferroic materials. Instead of using direct coupling between ferroelectric and ferromagnetic order parameters in a single-phase multiferroic material, which only shows a weak magnetoelectric effect, a unique method using indirect coupling through an intermediate antiferromagnetic order parameter can be used. In this article, we demonstrate electrical control of exchange bias using a field-effect device employing multiferroic (ferroelectric/antiferromagnetic) BiFeO 3 as the dielectric and ferromagnetic La 0.7 Sr 0.3 MnO 3 as the conducting channel; we can reversibly switch between two distinct exchange-bias states by switching the ferroelectric polarization of BiFeO 3. This is an important step towards controlling magnetization with electric fields, which may enable a new class of electrically controllable spintronic devices and provide a new basis for producing electrically controllable spin-polarized currents. © 2010 Macmillan Publishers Limited. All rights reserved.
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