Explicit and closed-form expressions for describing magnetic behaviors of uniaxial anisotropy materials

Quasi-Static Theory for Uniaxial Chiral Omega Media

The problem of unbounded uniaxial chiral omega media in the presence of both static electric and magnetic point charges is investigated. For this purpose scalar electric and magnetic potentials in these media are introduced. Using these potentials, the corresponding electric and magnetic fields are determined. The similar problem of static electric and magnetic current sources with the goal of ...

Uniaxial anisotropy and novel magnetic behaviors of CoFe 2 O 4 nanoparticlesprepared in a magnetic field

Anisotropy engineering in Co nanodiscs fabricated using prepatterned silicon pillars

Magnetic nanodiscs are fabricated by depositing cobalt onto 10–30 nm diameter silicon nanopillars, which were prepatterned using gold colloids as etch masks. The magnetic anisotropy energy of individual nanodiscs is studied by measuring the angular dependence of switching field using the micro-SQUID technique. The Stoner–Wohlfarth model, describing the magnetization reversal by unifom rotation,...

Biologically controlled synthesis and assembly of magnetite nanoparticles.

Magnetite nanoparticles have size- and shape-dependent magnetic properties. In addition, assemblies of magnetite nanoparticles forming one-dimensional nanostructures have magnetic properties distinct from zero-dimensional or non-organized materials due to strong uniaxial shape anisotropy. However, assemblies of free-standing magnetic nanoparticles tend to collapse and form closed-ring structure...

Magnetization reversal of submicrometer Co rings with uniaxial anisotropy via scanning magnetoresistance microscopy

We have investigated the magnetization reversal mechanism of narrow submicrometer Co rings using scanning magnetoresistance microscopy. Thermal annealing in a magnetic field introduced a uniaxial anisotropy and significant structural changes in the samples. We have observed a complicated multidomain state at intermediate field ranges, and onion states at saturation, for samples annealed in a fi...