Microstructural and ferromagnetic resonance properties of epitaxial nickel ferrite films grown by chemical vapor deposition

Abstract

Microstructural and ferromagnetic resonance properties of epitaxial nickel ferrite (NiFe2O4) films grown by direct liquid injection chemical vapor deposition are reported. While high-quality epitaxial growth of NiFe2O4 films on (100)-oriented MgAl2O4 substrate is confirmed by high resolution transmission electron microscopy, bright field (diffraction contrast) TEM studies reveal the presence of dislocations and also dark diffused contrast areas, which originate from antiphase domains. Angle and frequency-dependent ferromagnetic resonance (FMR) experiments are conducted to determine the magnetic anisotropy and the magnetic relaxation. A low out-of-plane FMR linewidth of ∼160 Oe has been observed at a frequency of 10 GHz.

Coexistence of Low Damping and Strong Magnetoelastic Coupling in Epitaxial Spinel Ferrite Thin Films

“…However, epitaxial NiZn‐ferrite thin films show extremely wide linewidths of ≈100 mT caused by high densities of crystal defects. These defects include misfit dislocations for films on isostructural MgAl 2 O 4 substrates (due to most spinel ferrites, including NiZn‐ferrite, having >3% lattice mismatch with MgAl 2 O 4 ) and antiphase boundaries for films on rock salt (e.g., MgO) and perovskite (e.g., SrTiO 3 ) substrates …”

Probing optical band gaps at the nanoscale in NiFe2O4 and CoFe2O4 epitaxial films by high resolution electron energy loss spectroscopy

“…INTRODUCTION Spinel oxides of NiFe 2 O 4 (NFO) and CoFe 2 O 4 (CFO) are being investigated extensively for their potential applications in spintronics and other devices. [1][2][3][4][5][6][7][8][9][10][11][12] These are ferrimagnetic insulators (semiconductors) with Curie temperature around 850 K and 800 K, respectively. Innovation in large area epitaxial thin film growth technology, particularly using direct liquid injection chemical vapor deposition (DLI-CVD), has made it possible to grow such materials with stoichiometric composition and physical properties close to the bulk crystals.…”

A comprehensive study of ferromagnetic resonance and structural properties of iron-rich nickel ferrite (Ni Fe3−O4, x≤1) films grown by chemical vapor deposition

“…The magnetic response of epitaxial single crystalline thin films and bulk crystals of hexagonal and spinel ferrite at microwave frequencies has attracted a lot of research attention in recent years. [1][2][3][4][5][6][7][8][9][10] Nickel ferrite (NiFe 2 O 4 ) is an important insulating magnetic spinel ferrite material for microwave device applications exhibiting a high Curie temperature of 585°C, a room temperature saturation magnetization of ~ 270 emu/cm 3 , with low microwave loss and magnetic anisotropy. [11][12][13][14] The observed properties are closely related to specific growth methods and process conditions, and can be tailored by factors such as surface morphology, microstructure, chemical composition, etc.…”

“…20 So far there have been limited reports on the FMR characterization of single crystalline NFO thin films. Li et al 8 reported a microstructural and ferromagnetic resonance study of NiFe 2 O 4 films grown by chemical vapor deposition (CVD), observing FMR linewidths approximately an order of magnitude lower than the pulsed laser deposited films at comparable frequencies. 8,17 We focused on a detailed temperature, frequency and angle dependent ferromagnetic resonance study of different compositions of single crystalline nickel ferrite films deposited by direct liquid injection chemical vapor deposition (DLI-CVD), to understand the dynamic magnetic properties.…”

“…Li et al 8 reported a microstructural and ferromagnetic resonance study of NiFe 2 O 4 films grown by chemical vapor deposition (CVD), observing FMR linewidths approximately an order of magnitude lower than the pulsed laser deposited films at comparable frequencies. 8,17 We focused on a detailed temperature, frequency and angle dependent ferromagnetic resonance study of different compositions of single crystalline nickel ferrite films deposited by direct liquid injection chemical vapor deposition (DLI-CVD), to understand the dynamic magnetic properties. High quality epitaxial NFO films on MgAl 2 O 4 substrates were deposited at three different growth temperatures (500°C, 600°C and 700°C), and were characterized for crystal structure, surface morphology, chemical composition, and static magnetic properties before the detailed FMR measurements.…”