Epitaxial growth and interface of (1 1 1)-oriented spinel Li0.5Fe2.5O4 film on SrTiO3(0 0 1) substrate

Lu, Lu; Liu, Kun; Zhang, Ruyi; Cheng, Shao-Dong; Mi, Shao-Bo

doi:10.1016/j.matlet.2023.135037

Materials Letters

2023

DOI: 10.1016/j.matlet.2023.135037

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Epitaxial growth and interface of (1 1 1)-oriented spinel Li0.5Fe2.5O4 film on SrTiO3(0 0 1) substrate

Lu Lu,

Kun Liu,

Ruyi Zhang

et al.

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2024

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Tailoring the Lithium Concentration in Thin Lithium Ferrite Films Obtained by Dual Ion Beam Sputtering

Prieto,

Hernández-Gómez,

Román-Sánchez

et al. 2024

Nanomaterials

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Thin films of lithium spinel ferrite, LiFe5O8, 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, LiFe5O8 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 O2+ ions during the growth process. Without assistance, a disordered rock-salt LFO phase (i.e., LiFeO2) can be identified as the principal phase. Under beam assistance, highly out-of-plane-oriented (111) thin LFO films have been obtained on (0001) Al2O3 substrates with a disordered spinel structure as the main phase and with lithium concentrations higher and lower than the stoichiometric spinel phase, i.e., LiFe5O8. 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-Fe2O3) phase emerged and coexisted in films with the ferromagnetic LixFe6-xO8. These results open up the possibility of controlling the properties of thin lithium ferrite-based films to enable their use in advanced spintronic devices.

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Tailoring the Lithium Concentration in Thin Lithium Ferrite Films Obtained by Dual Ion Beam Sputtering

Prieto,

Hernández-Gómez,

Román-Sánchez

et al. 2024

Nanomaterials

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Epitaxial growth and interface of (1 1 1)-oriented spinel Li0.5Fe2.5O4 film on SrTiO3(0 0 1) substrate

Cited by 1 publication

References 13 publications

Tailoring the Lithium Concentration in Thin Lithium Ferrite Films Obtained by Dual Ion Beam Sputtering

Tailoring the Lithium Concentration in Thin Lithium Ferrite Films Obtained by Dual Ion Beam Sputtering

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