Influence of silicon and cobalt substitutions on magnetostriction coefficient of cobalt ferrite

Abstract

Co 1+x Si x Fe 2−2x O 4 ferrite system has been studied to estimate the influence of Si and Co substitutions together on the magnetic and magnetostrictive properties. The samples were prepared by standard double sintering ceramic technique. X-ray diffraction patterns of the study confirm spinel crystal structures. Hysteresis and magnetostriction measurements were made on all the samples at room temperature. Mössbauer spectra were also made both at 300 K and at 4 K under the applied field of 5 T in the direction of gamma ray. Nominal decreases in Curie temperature and saturation magnetization were observed. The strain derivative, which relates to stress sensitivity, is observed to increase from 1.13 × 10 −9 to 2.51 × 10 −9 Å −1 m for x = 0.2 silicon concentration. The variations are explained on the basis of the strength of the exchange interactions between cations, and anisotropy modifications induced by migration of cobalt ions. The results demonstrate the possibility of controlling the magnetic and magnetomechanical properties through Co and Si substitutions.

The Phase Diagram and Exotic Magnetostrictive Behaviors in Spinel Oxide Co(Fe1−xAlx)2O4 System

“…Much effort has been dedicated to investigating the effects of doping other elements into CoFe 2 O 4 , including Ti 4+ , Mn 3+ , Cr 3+ , Ge 4+ , Ga 3+ , Si 4+ , etc. [5,6,7,8,9,10]. Nlebedim et al reported that the substitution of Al 3+ for Fe 3+ could result in the decrease of magnetostriction and the change of magnetostrictive coefficient, thus making cobalt–ferrite materials qualified for the sensors and actuators [11,12].…”

Magnetic Nanoparticles: Fabrication, Properties and Applications

“…Though the cobalt ferrite compounds have shown promising results in improving stress sensitivity at lower magnetic field strengths, they are also in need of reducing the magnetomechanical hysteresis which can be achieved by employing magnetic annealing as well as chemical modifications. Of late, cobalt ferrite based self composites comprising the mixtures of ferrite particles of different sizes spreading in the ranges from micron to a few nano meters prepared by both conventional solid state methods and wet preparation nano routes are being widely investigated as they have immense potential to cater the needs of non-contact torque and force sensors in several fields [14,15].…”

Ferromagnetism and Morphology of Annealed Fe2O3/CoXOY/ZnO Thin Films

“…Cobalt ferrite (CoFe 2 O 4 spinel) is one of the most important materials for noncontact torque sensing applications. The reasons are its remarkable electric and magnetic properties: it reveals the largest magnetostriction among the spinel ferrites (strain derivative d λ /dH = 1.1–1.3 · 10 −9 m A −1 1) and in combination with ferroelectric materials it is able to exhibit magnetoelectric effect 2…”

“…The physical properties of cobalt ferrites were found to be strongly dependent upon their structure and chemical composition. For instance, the addition of dopants such as Mn,3–5 Si,1 or Zn6 were found to strongly affect the magnetostrictive as well as the electric properties of the cobalt ferrites. Zinc doping was found to lead to an increase of the magnetoresistance 7.…”