Field-Cooled and Zero-Field-Cooled Magnetization of Superparamagnetic Fine Particles in Cu₉₇Co₃Alloy: Comparison with Spin-Glass Au₉₆Fe₄Alloy

Magnetic study of nanostructured zinc ferrite irradiated with 100MeV O-beam

“…Both these curves in pristine and irradiated samples tend to be superimposed above 349 and 278 K, respectively. These temperatures are known as irreversible temperatures (T irr ) and occurrence of this type of behavior is common in superparamgnetic and spin glass state [25][26][27][28]. We observe that the divergence is larger in the pristine sample compared to the irradiated sample.…”

“…3 shows the divergence between ZFC and FC curves at a certain temperature, which is a characteristic feature of the superparamagnetic system. This type of divergence arises from the anisotropy barrier blocking of the magnetization direction in the nanoparticle system cooled with a ZFC process [25]. From these thermal magnetization curves, a thermo-magnetic irreversibility can be seen easily from the distinct difference between the ZFC and FC magnetization curves.…”

Self-assembly of magnetic Ni nanoparticles into 1D arrays with antiferromagnetic order

“…Here L(x) is the Langevin function, τ m ≈ 1 s is the characteristic timescale for a DC SQUID measurement and τ 0 ≈ 10 -9 s is the inverse attempt frequency quantifying the rate at which a thermally activated nanoparticle attempts to overcome the energy barrier which separates the up from the down magnetized state [52]. With τ m and τ 0 from above Figure 5 shows magnetization measurements performed on isolated nanoparticles cast on substrates in the absence of magnetic field.…”

Evolution of size, morphology, and magnetic properties of CuO nanoparticles by thermal annealing

“…Below T B , the FC magnetization increases monotonously with decreasing temperature, which is a characteristic feature of superparamagnetic particles. 43 As a typical blocking behavior of superparamagnetic nanoparticles, T B varies as the strength of applied magnetic field changes. Figure 5 shows the temperature dependence of FC and ZFC magnetization curves measured in different applied magnetic fields for 13 nm particles.…”