Voltage-controlled ON switching and manipulation of magnetization via the redox transformation of β-FeOOH nanoplatelets. (13th December 2019)

• Record Type: Journal Article
• Authors: Nichterwitz, Martin; Neitsch, Sabine; Röher, Stefan; Wolf, Daniel; Nielsch, Kornelius; Leistner, Karin
• Is Part Of: Journal of physics. Volume 53:Number 8(2020)
• Publication Date: 2019-12-13
• Subjects: magnetoelectric actuation -- magneto-ionic effects -- voltage control of magnetism -- iron oxyhydroxide -- iron films; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/ab5bca
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: Redox-based metal/metal oxide transformations achieved via electrolytic gating recently emerged as a novel, magneto-ionic route for voltage control of magnetism. So far, mainly metal or oxide thin films and nanoporous metal alloy structures are used as starting materials. The present study demonstrates a magneto-ionic transformation starting from a stable electrodeposited FeOOH nanoplatelet structure. The application of a low voltage in a Li-based electrolyte results in the reduction of the virtually non-magnetic FeOOH into ferromagnetic Fe, yielding an ON switching of magnetization. The magnetization can be tuned in a large range by the time of voltage application and remains stable after voltage-switch off. A reversible magneto-ionic change of magnetization of up to 15% is achieved in the resulting iron films with a thickness of about 30 nm. This large magneto-ionic effect is attributed to the enhanced roughness of the iron films obtained from the nanoplatelet structure. The robust, voltage-controlled, and non-volatile ON switching of magnetism starting from a stable oxide structure is promising for the development of energy-efficient magnetic switches, magnetic actuation and may offer new avenues in magnetoelectronic devices.