Magnetic Study of Nanostructural Composite Material Based on Cobalt Compounds and Porous Silicon

Brain tumor magnetic targeting and biodistribution of superparamagnetic iron oxide nanoparticles linked with 70-kDa heat shock protein study by nonlinear longitudinal response

“…anisotropy of NP-form and surface anisotropy of NP [24]. As it was shown earlier, in this case the shape of hysteresis curves depends on F sc and temperature [23] and SPM regime occurs above blocking temperature T B [24]. Thus, the regime of magnetic behavior of NPs and its possible transformation under effect of environment can be controlled on a presence of Hhysteresis in their M 2 -response.…”

“…Thus, an equilibrium state in NP ensemble after switching on external field H will be achieved after changing an orientation of the moments relative to anisotropy axis in some part of ensemble. This is performed by mounting the energy barrier which depends generally both on anisotropy and Zeeman energies and so a relaxation rate of this process will be function of field [23,24,31]. For our Fe-based NPs one can wait an emergence of ImM 2 signal with the opposite sign relative to ReM 2 one, as in Co-based composite [23].…”

“…It was also employed successfully for interpretation of M 2 data (that was qualitative in a presence of the field hysteresis in the M 2 (H) curves) obtained earlier at studying of complex magnet, exhibiting phase separation phenomena, such as manganites and cobaltites [28, 29 and Res. therein] as well as composite material based on Cocompounds [23].…”

Microstructure and Magnetic State of Fe3O4-SiO2Colloidal Particles

“…This contribution is proportional to (∂Γ(H)/ ∂H)·(∂M(H)/∂H) [39]. In our case of the periodic H-scan and synchronous detection of a response, H-hysteresis will be observed in M 2 (H) response of single domain NP ensemble, if a period of H-scan 1/F sc ≤ τ = 1/Γ.…”

“…In our case of the periodic H-scan and synchronous detection of a response, H-hysteresis will be observed in M 2 (H) response of single domain NP ensemble, if a period of H-scan 1/F sc ≤ τ = 1/Γ. Therefore, in blocking regime below T b the field hysteresis should depend on F sc [39]. We characterize further the field hysteresis in the second harmonic of magnetization by a value of "coercive force"…”