Magnetic Properties of Epitaxial NiFe₂O₄ Thin Films Prepared Using Dynamic Aurora PLD in a Magnetic Field

Abstract

This study examined effects of applying a magnetic field (up to 2 kG) on the magnetic properties of epitaxial NiFe2O4(NF) thin films during deposition. The NF films were deposited on Y0.15Zr0.85O1.93 (YSZ) buffered Si (001) substrates using pulsed laser deposition (PLD). Although application of magnetic field during deposition affected neither the crystal structure nor orientation of the NF thin films, it improved magnetic properties. The saturation magnetization (Ms) of NF thin films deposited at 500°C and 600°C without application of a magnetic field was as low as 40 emu/g. However, that of NF deposited under magnetic field of 2 kG got to bulk Ms (50.3 emu/g). The TEM observation results revealed that the anti-phase boundary (APB) density decreased by application of the magnetic field during deposition. Results show that magnetic properties of NF thin films are controllable using the magnetic field during deposition.

Magnetic field effects during deposition on crystal structure and magnetic properties of BaFe₁₂O₁₉ thin films prepared using PLD in the magnetic field (Dynamic aurora PLD)

“…5(a) and 5(b), Ms of BaM thin film decreased with the magnetic field during deposition. This tendency is exactly the opposite in the case of ZnFe 2 O 4 1) and NiFe 2 O 4 , 2) although BaM contains spinel blocks in the crystal structure. To explain this result, several possibilities can be considered.…”

“…1), 2) In this PLD chamber, a maximum 2 kG of magnetic field parallel to the direction from the target to the substrate can be applied during thin film deposition. Therefore, the effects of applying a magnetic field on the thin film properties can be examined.…”

Possibility and Optimized Conditions for Spontaneous Superlattice Formation in Stabilized Zirconia Thin Films Grown Under In Situ Magnetic Field

“…The experimental setup for Dynamic Aurora PLD can be found in some of our previous reports (Wakiya et al 2007;Kubo et al 2011;Suzuki et al 2013, Wakiya et al 2016, Debnath et al 2017, Debnath et al 2018, Lizuka et al 2023. The direction of the induced magnetic field is parallel to the direction from the target to the substrate.…”

“…It has many manufacturing steps which is the barrier to practical uses on a large scale. In our laboratory we developed a specially designed pulsed laser deposition (PLD) technique, through which we can apply a magnetic field during thin film growth, named Dynamic Aurora PLD (Wakiya et al 2007;Kubo et al 2011;Suzuki et al 2013;Wakiya et al 2016, Debnath et al 2017Wakiya et al 2017, Debnath et al 2018Lizuka et al 2023). Spontaneous superlattice structure is formed in the case of perovskite SrTiO 3 (STO) system by the application of in situ magnetic field during film growth (Wakiya et al 2016).…”