Journal of Applied Physics · 2012 · 52 citations · 19 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMagnetic MaterialsSolid State PhysicsCurie TemperatureFerrimagnetic MaterialsFerromagnetismMagnetic AnisotropyMagnetic OxidesMagnetic Properties Of SolidsAnisotropyAnisotropy ConstantFerrimagnetic NanoparticlesMagnetic HysteresisSaturation MagnetizationTemperature DependenceTemperature Dependence Of AnisotropyTemperature-dependent Magnetization
Magnetic hysteresis loops were measured for ferrimagnetic iron chalcogenide [Formula: see text] nanoparticles in the whole temperature range below the Curie temperature [Formula: see text] (315 K). The coercivity of the material is huge, reaching about 40 kOe at 10 K. The magnetic anisotropy constant K was determined from the magnetic hysteresis loop using the law of approach to saturation. The deduced anisotropy constant at 10 K is [Formula: see text], which is over one order of magnitude larger than that of [Formula: see text]. We also demonstrated that the experimental magnetic hysteresis loop is in good agreement with the theoretical curve calculated by Stoner and Wohlfarth for a noninteracting randomly oriented uniaxial single-domain particle system. Moreover, we show that K is proportional to the cube of the saturation magnetization [Formula: see text], which confirms earlier theoretical models for uniaxial magnets.
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Superconductivity in the PbO-type structure α-FeSe
Fong-Chi Hsu, Jiu-Yong Luo, K. C. Yeh et al. · Proceedings of the National Academy of Sciences · 2008 · 2.9K citations · Full text
On the Anisotropy of Cubic Ferromagnetic Crystals
J. H. Van Vleck · Physical Review · 1937 · 628 citations