ELECTRIC CONTROL OF MAGNETIC SWITCHING AND NEGATIVE MAGNETIC PERMEABILITY IN NANOSCALE COMPOSITE MULTIFERROICS

摘要

Steering magnetism with electric fields via interfacing appropriate ferromagnetic and ferroelectric materials to achieve a multiferroic response bears a great potential for nano-scale devices with qualitatively new functionalities . Here, we demonstrate via ferromagnetic resonance of polycrystalline Co_(92)Zr_8 film deposited on ferroelectric PMN-PT that at room temperature the interfacial magnetoelectric coupling allows for electric-field control of simultaneously the magnetization precession and its damping, both of which are the essential elements for magnetic switching. We uncover furthermore an electric-field-induced negative magnetic permeability effect, pointing so to a new class of optical negative-index metamaterials based on multiferroics. This research was supported by the National Basic Research Program of China (No. 2012CB933101), the National Natural Science Foundation of China (No. 11104123), the Program for Changjiang Scholars and Innovative Research Team in University (No. IRT1251), and the German Research Foundation (No. SFB 762).