Thermal effects on the magnetic properties of titanium modified cobalt ferrite

Abstract

The temperature dependence of the magnetic properties of titanium modified cobalt ferrite is presented. The change of maximum magnetization obtained at H ≈ 2.4 MA/m between any two temperatures increases systematically with composition, which is desirable for applications in devices. Variation in magnetocrystalline anisotropy and coercivity were different from previous studies on cation substituted cobalt ferrite. At lower concentrations, the effect of lower thermal energy dominated the effect of non-magnetic cation substitutions in controlling the anisotropy.The reverse was the case at higher concentrations. The temperature dependence of coercivity is dominated by the contribution of magnetocrystalline anisotropy to coercivity, while the compositional dependence of coercivity is dominated by microstructural contribution through the pinning of domain walls. The temperature dependence of the magnetic properties of titanium modified cobalt ferrite is presented. The change of maximum magnetization obtained at H % 2.4 MA/m between any two temperatures increases systematically with composition, which is desirable for applications in devices. Variation in magnetocrystalline anisotropy and coercivity were different from previous studies on cation substituted cobalt ferrite. At lower concentrations, the effect of lower thermal energy dominated the effect of nonmagnetic cation substitutions in controlling the anisotropy. The reverse was the case at higher concentrations. The temperature dependence of coercivity is dominated by the contribution of magnetocrystalline anisotropy to coercivity, while the compositional dependence of coercivity is dominated by microstructural contribution through the pinning of domain walls. V C 2015 AIP Publishing LLC.

Properties, applications, and synthesis of first transition series substituted cobalt ferrite: a mini review

“…The titanium doped CF-NPs showed the reduced Curie temperatures, decreased magneto mechanical hysteresis and magnetic anisotropy. The reduction in magnetiocrystalline anisotropy continued for the limit (x=0.3) at 300 K [6,7]. The chromium substituted CF-NPs decreased magnetic anisotropy.…”

“…In the literature FTEs doped CF-NPs can be synthesised by using different methods of synthesis e.g. Ostwald riping [3][4], auto combustion [17,22], ceramic method [7], citrate gel autocmbustion [9], conventional ceramic method [6], co-precipitation [10,15,16,23], Fast hydrothermal [14], green synthesis [25], hydrothermal [18], octanoate co-precipitation [21], sol-gel [5,11,19,24], solid-state reaction method [26], standard powder ceramic technique [8, 12,13], and wet chemical coprecipitation method [20] to name but a few.…”

“…Doping with vanadium improved the size, phase evolution, morphology, and magnetic properties of CF-NPs [5]. Doping with titanium, chromium and zinc reduced the Curie Temperature of CF-NPs [6,7,26]. Nlebedim et al observed that the magnetic anisotropy of titanium doped samples decreased temperature irrespective of the level of doping (they used the same dopant Ti 4+ ) [7].…”

“…Doping with titanium, chromium and zinc reduced the Curie Temperature of CF-NPs [6,7,26]. Nlebedim et al observed that the magnetic anisotropy of titanium doped samples decreased temperature irrespective of the level of doping (they used the same dopant Ti 4+ ) [7]. Chromium doping improved the dielectric and fluorescence properties.…”

Tailoring the optical bandgap and magnetization of cobalt ferrite thin films through controlled zinc doping

“…Recent efforts have been made to study the substitution effect in CFO thin film on the magnetic and magnetoresistive [15][16][17][18] properties, but there has been no report to study the optical properties of CFO thin films by zinc substitution yet.…”