ABSTRACT: Magnon-spintronics, which use pure spin currents to deliver spin angular momentum without net charge flow, holds great promises to revolutionize next-generation information technologies by significantly reducing Joule heating. A key challenge is to control the propagation of pure spin currents, ideally by using an electric-field. Multiferroic oxides, with a coexistence of ferroelectric and magnetic orderings, provide a promising material platform to address this challenge. In this talk, I will present our recent progress on the magnon current transport in perovskite complex oxides, as exemplified by the multiferroic BiFeO3 and La1-xBixFeO3. We show that the insulating perovskite oxides can efficiently deliver the spin current. Both the transmission and spin polarization of pure spin current can be precisely controlled, which is closely correlated to the nature of antiferromagnetic ordering. Moreover, we demonstrate that the magnon current transport in the multiferroics can be manipulated by using electric-field, due to the coupling of ferroelectric polarization and antiferromagnetic order. This progress could pave the pathway for developing energy-efficient magnon-based logic and memory devices.

CEEMag is a Department of Energy – Energy Frontier Research Center