Open AccessVoltage-controlled ON switching and manipulation of magnetization via the redox transformation of β-FeOOH nanoplatelets
Author(s) -
Martin Nichterwitz,
Sabine Neitsch,
Stefan Röher,
Daniel Wolf,
Kornelius Nielsch,
Karin Leistner
Publication year - 2019
Publication title -
journal of physics. d, applied physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.857
H-Index - 198
eISSN - 1361-6463
pISSN - 0022-3727
DOI - 10.1088/1361-6463/ab5bca
Subject(s) - materials science , magnetization , magnetism , oxide , electrolyte , ionic bonding , ferromagnetism , voltage , metal , nanotechnology , chemical engineering , electrode , condensed matter physics , magnetic field , chemistry , metallurgy , electrical engineering , ion , physics , organic chemistry , quantum mechanics , engineering
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.