Evidence of two-fold and four-fold anisotropies by ferromagnetic resonance in zinc ferrite thin films
ORAL
Abstract
By means of ferromagnetic resonance (FMR) technique the magnetic properties of ZnFe2O4 (ZFO) films grown on Si(111), MgO(100), and STO(100) were investigated. By using a model that takes into consideration the relevant contributions to the energy, we were able to extract the following parameters: effective magnetization Meff, cubic magnetocrystalline anisotropy field, in-plane, and out-of-plane uniaxial anisotropy fields, as well as the g factor. The samples deposited on Si showed a twofold in-plane anisotropy while a fourfold magnetic anisotropy was observed for the ZFO/MgO and ZFO/SrTiO3 samples. All samples showed a strong perpendicular uniaxial anisotropy above 1 kOe and low in-plane uniaxial and cubic anisotropy field, of the order of tenths of Oe. The FMR linewidth (ΔH) fitted from FMR data show values above 190 Oe for all samples, indicating high damping of this material to be ∼10-2.
*This work was supported by Solid State Group - GES at the University of Antioquia in the framework of Sustainability Strategy 2020-2021 and by Colombian Science and technology Ministry (project no. 111580863381, contract 325-2019). We thank the following Brazilian agencies for partial funding: Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Financiadora de Estudos e Projetos (FINEP), Fundação de Amparo à Ciência e Tecnologia do Estado de Pernambuco (FACEPE).
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Publication:The manuscript "Investigation of two-fold and four-fold anisotropies by ferromagnetic resonance in zinc ferrite thin films" (BG14766) was sent for resubmission to Physical Review B.
