Magnetic and optical response of tuning the magnetocrystalline anisotropy in Fe3O4 nanoparticle ferrofluids by Co doping

Improved specific loss power on cancer cells by hyperthermia and MRI contrast of hydrophilic FexCo1‐xFe2O4 nanoensembles

“…Increased coercivity with rising superparamagnetic T B was reported in the literature . Increased superparamagnetic T B with rising anisotropy due to greater addition of Co in Fe‐Co ferrite system was also reported . It should be further mentioned that most of the nanoparticles which do not have any interaction follow Néel‐Brown equation, which is represented as τ = τ o exp( E B / k B T ).…”

“…Since there is limitation with the increase of particle size for biomedical applications, the SLP can be optimized by effective tuning of magnetization and anisotropy . Given that the magnetocrystalline anisotropy of Fe 3 O 4 and CoFe 2 O 4 nanoparticles are 14 and 380 kJ/m 3 respectively , this large difference in anisotropy allows effective tuning of the anisotropy of the Fe‐Co mixed spinel system. Thus the aims of the present research project was to synthesize and characterize surface‐modified Fe x Co 1‐x Fe 2 O 4 nanoparticles and investigate their efficacy in hyperthermia protocol of cancer treatment and as MRI contrast agents in vitro by effective tuning of anisotropy and magnetization through compositional variations.…”

Nanoscale Clustering and Magnetic Properties of Mn x Fe3−x O4 Particles Prepared from Natural Magnetite

“…As shown, the maximum peak of the ZFC curve tends to shift to lower temperature as x increases. The maximum peak observed in the ZFC curve is defined as the magnetic blocking temperature (T B ) [43][44][45] and occurs where the anisotropy energy barrier is comparable to the thermal energy of the particles. Due to the effect of magnetic randomization, the magnetic nanoparticles do not magnetically interact above T B ; however, they do interact and exhibit ferromagnetic-like properties below T B [46].…”

Fabrication, characterization and measurement of thermal conductivity of Fe3O4 nanofluids

“…Although the magnetic properties of the magnetic nanofluids are the subject of intense studies [9][10][11], there are few data in the literature concerning their thermal properties [12][13][14][15][16][17]. The investigation of heat transfer characteristics of magnetic nanofluids is very interesting and important from the viewpoint of fundamental study on their thermal behaviors and the development of practical thermal devices of magnetic nanofluids in a number of areas such as the new kind of heat exchangers, cooling loops, and energy conversion systems [2].…”