Magnetic and structural properties of laser deposited lithium ferrite films

Abstract

Abslrad-Thin f i l m s of lithium-zinc ferrite have been grown by pulsed laser deposition techniques under varying oxygen partial pressures. X-ray diffraction measurements showed the films grew epitaxially onto the (001) MgO substrates. Films grown at lower oxygen pressures displayed cubic anisotropy with parameters close to bulk values, with the film grown at the lowest pressure having the highest saturation magnetization and the narrowest ferromagnetic resonance linewidth. The film grown at the highest pressure displayed in-plane uniaxial anisotropy and a relatively low magnetization.

Microstructural, dielectric and magnetic behavior of spin-deposited nanocrystalline nickel–zinc ferrite thin films for microwave applications

“…Nanocrystalline (10-50 nm) ferrite thin films with spinel cubic structure have been subject of extensive investigation because of their potential applications in high-density magneto-optic recording devices, color imaging, bioprocessing, magnetic refrigeration and ferrofluids [2,3]. In particular, nanocrystalline nickel-zinc ferrite thin films are of great interest at microwave frequencies not only due to properties like high resistivity (X10 6 O-cm) and lower losses but also because they can be easily prepared at lower annealing temperature [4][5][6][7][8][9][10]. Nickel-zinc ferrite thin films can also be used as non-reciprocal ferrite components on a microwave monolithic integrated circuit (MMIC) based on GaAs and as back layers to improve recording performances at high frequencies [11,12].…”

Annealing effect on the structural and magnetic properties of nickel ferrite thin films

“…+3 Ni 1−x +2 ] B .O 4 . As x increases from 0.0 to 1.0, the value of Ms increases from 2 µ B to 8 µ B assuming antiferromagnetic coupling of magnetic moments at the A and B sites at 0 K. The highest value (427 emu cm −3 ) for 800…”

Correlation of grain boundary nature with magnetization in RF-sputtered lithium–zinc ferrite thin films

“…Structural and magnetic properties of lithium-zinc ferrite films have been extensively studied in our laboratory [13][14][15][16]. Like almost all ferrite thin films [17][18][19], the saturation magnetization (M S ) values of the Li-Zn ferrite films are reported to be lower than the corresponding bulk saturation values [4][5][6][13][14][15]. Although the reduction of film magnetization as compared to its bulk value is thought to be due to the defective film microstructure [13,15], no systematic study has so far been reported with respect to crystallographic texture and microstructure.…”

“…Hence, recent developments in thin film growth and characterization techniques have stimulated a lot of research interest on lithium-based ferrite thin films [4][5][6][7][8][9][10][11][12]. Structural and magnetic properties of lithium-zinc ferrite films have been extensively studied in our laboratory [13][14][15][16].…”