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| Home > Articles > Published articles > Composition-Dependent Voltage-Driven OFF-ON Switching of Ferromagnetism in Co-Ni Oxide Microdisks |
| Home > Articles > Published articles > Composition-Dependent Voltage-Driven OFF-ON Switching of Ferromagnetism in Co-Ni Oxide Microdisks |
(Universitat Autònoma de Barcelona. Departament de Física) (Universitat Autònoma de Barcelona. Departament de Física) (Universitat Autònoma de Barcelona. Departament de Física) (Institut de Microelectrònica de Barcelona) (Universitat Autònoma de Barcelona. Departament de Física) (Centre for Electrochemical Technologies) (Centre for Electrochemical Technologies) (Centre for Electrochemical Technologies) (Centre for Electrochemical Technologies) (A6K Advanced Engineering Centre) (A6K Advanced Engineering Centre) (A6K Advanced Engineering Centre) (Universitat Autònoma de Barcelona. Departament de Física) (Universitat Autònoma de Barcelona. Departament de Física) (Universitat Autònoma de Barcelona. Departament de Física)
| Date: | 2025 |
| Abstract: | Magneto-ionics, which refers to the modification of the magnetic properties of materials through electric-field-induced ion migration, is emerging as one of the most promising methods to develop nonvolatile energy-efficient memory and spintronic and magnetoelectric devices. Herein, the controlled generation of ferromagnetism from paramagnetic Co-Ni oxide patterned microdisks (prepared upon thermal oxidation of metallic microdisks with dissimilar Co-Ni ratios, i. e. , NiCo and NiCo) is demonstrated under the action of voltage. The effect is related to the partial reduction of the oxide phases to their metallic forms. Samples richer in Co show stronger magneto-ionic activity, which manifests in lower-onset threshold voltages, faster switching rates, and larger values of the attained saturation magnetization. By means of scanning electron microscopy, a cobalt segregation phenomenon has been experimentally observed upon thermal oxidation, which has been theoretically discussed from the diffusivities' viewpoint. X-ray diffraction characterization has revealed transitions between purely mixed Ni and Co oxides, in the OFF state, to a mixture of oxide and metallic phases, in the ON state, because of the oxygen ion motion outward/inward the Co-Ni oxide microdisks, depending on the voltage polarity. Ab initio calculations reveal that the energy barrier for oxygen vacancy migration is lower in CoO than in NiO, in agreement with the obtained magneto-ionic responses. The observation of magneto-ionic effects in patterned disks (and not only in archetypical continuous films) is a step further for the practical utilization of this phenomenon in real miniaturized devices. |
| Grants: | Agencia Estatal de Investigación PID2020-116844RB-C21 Agencia Estatal de Investigación PID2020116844RB-C22 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00651 Agencia Estatal de Investigación CNS2022-135230 Agencia Estatal de Investigación PDC2021-121276-C31 Agencia Estatal de Investigación PDC2021-121276-C32 European Commission 101058076 European Commission 101054687 Agencia Estatal de Investigación CEX2023-001397-M |
| Rights: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.  |
| Language: | Anglès |
| Document: | Article ; recerca ; Versió publicada |
| Published in: | ACS applied materials & interfaces, Vol. 17, Issue 6 (February 2025) , p. 9500-9513, ISSN 1944-8252 |
