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Exchange bias and magnetocrystalline anisotropy of non-stoichiometric CoxFe3−xO4 nanoparticles
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Exchange bias and magnetocrystalline anisotropy of non-stoichiometric CoxFe3−xO4 nanoparticles
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Journal Article
Exchange bias and magnetocrystalline anisotropy of non-stoichiometric CoxFe3−xO4 nanoparticles
2022
Overview
We report the influence of Co concentration on the exchange bias and magnetocrystalline anisotropy of Co
x
Fe
3−
x
O
4
(
x
= 0.0, 0.4, 0.7, 1.0) nanoparticles. Co ions were substituted in magnetite (Fe
3
O
4
) nanoparticles to obtain non-stoichiometric Co
x
Fe
3−
x
O
4
nanoparticles. The concentration of Co (mol) was varied from 0.0 to 1.0. Structure and magnetic anisotropic properties of non-stoichiometric Co
x
Fe
3−
x
O
4
nanoparticles were studied. The prepared Co
x
Fe
3−
x
O
4
nanoparticle was quasi-spherical in shape with particle sizes ranging from 15 to 20 nm. Raman and X-ray photoelectron spectroscopic (XPS) studies suggest the transformation of inverse to normal spinel structure concerning Co concentration. Blocking temperature increases from 155 to 302 K with an increase in concentration (mol) from 0.0 to 1.0 respectively. Co
x
Fe
3−
x
O
4
(
x
= 0.7) resulted in an exchange bias field and large magnetocrystalline anisotropy of about 70 Oe and 5.38 × 10
4
J/m
3
. Due to large magnetocrystalline anisotropy, Co
x
Fe
3−
x
O
4
(
x
= 0.7) shows a low exchange bias field. Co
x
Fe
3−
x
O
4
(
x
= 1.0) show room temperature hysteresis with coercivity of about 14.5 kOe at 5 K and
M
S
of 45 emu/g.
Publisher
Springer US,Springer Nature B.V
