نتایج جستجو برای: magnetisation
تعداد نتایج: 815 فیلتر نتایج به سال:
The structural and magnetic properties of magnetic multi-core particles were determined by numerical inversion of small angle scattering and isothermal magnetisation data. The investigated particles consist of iron oxide nanoparticle cores (9 nm) embedded in poly(styrene) spheres (160 nm). A thorough physical characterisation of the particles included transmission electron microscopy, X-ray dif...
– We investigate the effects of surface anisotropy in a spherical magnetic nanoparticle. By computing minor loops, 2D and 3D energyscape, and by investigating the behaviour of the net magnetisation, we show that the behaviour of a many-spin particle is modeled by a macro-spin effective energy containing a uniaxial and cubic anisotropy terms. Introduction. – A magnetic nanoparticle exhibits many...
Despite their ubiquity, there are many open questions regarding galactic and cosmic magnetic fields. Specifically, current observational constraints cannot rule out if fields observed in galaxies were generated the Early Universe or of astrophysical nature. Motivated by this we use our tracers algorithm to investigate whether signatures primordial persist throughout time. We simulate a Milky Wa...
We review our ongoing work on deploying optical (atomic) magnetometry for measuring the magnetic response of magnetic nanoparticle (MNP) samples, yielding MNP size distributions, and other sample parameters like Néel relaxation time τ , saturation magnetisation Ms, anisotropy constant K and magnetic susceptibility χ. We address magnetorelaxation (MRX) signals, in which the decaying magnetisatio...
FC-ZFC magnetisation, hysteresis, thermoremanence and neutron diffraction measurements were performed on Li1.125Feo.625Ti1.2504. The results are interpreted from domain and wall properties resulting of local canted state where the spin transverse component relaxes between preferential directions.
Nucleation during magnetisation reversal in the two dimensional Ising model presence of randomly positioned spin 0 impurities.
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