Tailoring the Lithium Concentration in Thin Lithium Ferrite Films Obtained by Dual Ion Beam Sputtering
Prieto Vives, Pilar 1965- (Universidad Autónoma de Madrid)
Hernández-Gómez, Cayetano (Universidad Autónoma de Madrid)
Román-Sánchez, Sara (Instituto de Cerámica y Vidrio (CSIC))
París Ogáyar, Marina (Universidad Autónoma de Madrid)
Gorni, Giulio (ALBA Laboratori de Llum de Sincrotró)
Prieto, José Emilio (Instituto de Química Física Blas Cabrera)
Serrano, Aida (Departamento de Electrocerámica, Instituto de Cerámica y Vidrio)

Data:	2024
Resum:	Thin films of lithium spinel ferrite, LiFeO, have attracted much scientific attention because of their potential for efficient excitation, the manipulation and propagation of spin currents due to their insulating character, high-saturation magnetization, and Curie temperature, as well as their ultra-low damping value. In addition, LiFeO is currently one of the most interesting materials in terms of developing spintronic devices based on the ionic control of magnetism, for which it is crucial to control the lithium's atomic content. In this work, we demonstrate that dual ion beam sputtering is a suitable technique to tailor the lithium content of thin films of lithium ferrite (LFO) by using the different energies of the assisting ion beam formed by Ar + and O + ions during the growth process. Without assistance, a disordered rock-salt LFO phase (i. e. , LiFeO) can be identified as the principal phase. Under beam assistance, highly out-of-plane-oriented (111) thin LFO films have been obtained on (0001) AlO substrates with a disordered spinel structure as the main phase and with lithium concentrations higher and lower than the stoichiometric spinel phase, i. e. , LiFeO. After post-annealing of the films at 1025 K, a highly ordered ferromagnetic spinel LFO phase was found when the lithium concentration was higher than the stoichiometric value. With lower lithium contents, the antiferromagnetic hematite (α-FeO) phase emerged and coexisted in films with the ferromagnetic LiFeO. These results open up the possibility of controlling the properties of thin lithium ferrite-based films to enable their use in advanced spintronic devices.
Ajuts:	Agencia Estatal de Investigación PID2021-124585NB-C32 Agencia Estatal de Investigación PID2021-124585NB-C33 Agencia Estatal de Investigación PID2021-124585NB-C31 Agencia Estatal de Investigación PID2020-113142RB-C21 Ministerio de Ciencia e Innovación TED2021-130196B-C22 Ministerio de Ciencia e Innovación TED2021-130957B-C51 Ministerio de Ciencia e Innovación TED2021-130957B-C54 Agencia Estatal de Investigación RYC2021-031236-I
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:	Lithium ferrite ; Lithium concentration ; Ion beam assistance ; X-ray absorption spectroscopy ; Raman microscopy
Publicat a:	Nanomaterials, Vol. 14, Num. 14 (July 2024) , art. 1220, ISSN 2079-4991

DOI: 10.3390/nano14141220
PMID: 39057896

17 p, 6.8 MB

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