Hydroxide-based magneto-ionics: electric-field control of a reversible paramagnetic-to-ferromagnetic switch in α-Co(OH)2 films. Issue 45 (8th November 2022)

• Record Type: Journal Article
• Authors: Quintana, Alberto; Firme, Abigail A.; Jensen, Christopher J.; Zheng, Dongxing; Liu, Chen; Zhang, Xixiang; Liu, Kai
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 45(2022)
• Page Start: 17145
• Page End: 17153
• Publication Date: 2022-11-08
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2tc03422k
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Here we demonstrate highly effective hydroxide-based magneto-ionics in electrodeposited α-Co(OH)2 films. The α-Co(OH)2, which is a room temperature paramagnet, is reversibly switched between paramagnetic-ferromagnetic states after electrolyte gating. Abstract : Magneto-ionics has emerged as a promising approach to manipulate magnetic properties, not only by drastically reducing power consumption associated with electric current based devices but also by enabling novel functionalities. To date, magneto-ionics have been mostly explored in oxygen-based systems, while there is a surge of interest in alternative ionic systems. Here we demonstrate highly effective hydroxide-based magneto-ionics in electrodeposited α-Co(OH)2 films. The α-Co(OH)2, which is a room temperature paramagnet, is switched to ferromagnetic after electrolyte gating with a negative voltage. The system is fully, magnetically reversible upon positive voltage application. The origin of the reversible paramagnetic-to-ferromagnetic transition is attributed to the ionic diffusion of hydroxyl groups, promoting the formation of metallic cobalt ferromagnetic regions. Our findings demonstrate one of the lowest turn-on voltages reported for propylene carbonate gated experiments. By tuning the voltage magnitude and sample area we demonstrate that the speed of the induced ionic effect can be drastically enhanced.