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Pàgina inicial > Articles > Articles publicats > Magneto-ionic suppression of magnetic vortices |
Data: | 2021 |
Resum: | Magneto-ionics refers to the non-volatile control of the magnetic properties of materials by voltage-driven ion migration. This phenomenon constitutes one of the most important magnetoelectric mechanisms and, so far, it has been employed to modify the magnetic easy axis of thin films, their coercivity or their net magnetization. Herein, a novel magneto-ionic effect is demonstrated: the transition from vortex to coherent rotation states, caused by voltage-induced ion motion, in arrays of patterned nanopillars. Electrolyte-gated Co/GdOx bilayered nanopillars are chosen as a model system. Electron microscopy observations reveal that, upon voltage application, oxygen ions diffuse from GdOx to Co, resulting in the development of paramagnetic oxide phases (CoOx) along sporadic diffusion channels. This breaks up the initial magnetization configuration of the ferromagnetic pillars (i. e. vortex states) and leads to the formation of small ferromagnetic nanoclusters, embedded in the CoOx matrix, which behave as single-domain nanoparticles. As a result, a decrease in the net magnetic moment is observed, together with a drastic change in the shape of the hysteresis loop. Micromagnetic simulations are used to interpret these findings. These results pave the way towards a new potential application of magnetoelectricity: the magneto-ionic control of magnetic vortex states. |
Ajuts: | European Commission 892661 European Commission 875018 Agencia Estatal de Investigación MAT2017-86357-C3-1-R Agencia Estatal de Investigación PID2019-106860GB-I00 Agencia Estatal de Investigación PID2020-116844RB-C21 Ministerio de Ciencia e Innovación CEX2019-000917-S Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-292 Agència de Gestió d'Ajuts Universitaris i de Recerca 2018/LLAV-00032 |
Drets: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió publicada |
Matèria: | Magnetoelectric ; Magneto-ionics ; Vortex ; Voltage control of magnetism |
Publicat a: | Science and Technology of Advanced Materials, Vol. 22, Issue 1 (2021) , p. 972-984, ISSN 1878-5514 |
14 p, 7.8 MB |