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See detailOn the specific absorption rate of hyperthermia fluids
Perigo, Elio Alberto UL; Sampaio, Fernanda; de Campos, Marcos Flavio

in Applied Physics Letters (2013), 103

The specific absorption rate (SAR) concept of hyperthermia ferrofluids is discussed. It is first suggested that SAR can be characterized at the steady state condition, taking into account the heating flow ... [more ▼]

The specific absorption rate (SAR) concept of hyperthermia ferrofluids is discussed. It is first suggested that SAR can be characterized at the steady state condition, taking into account the heating flow mechanism from the ferrofluid to the external environment. The temperature dependence of SAR is then addressed, indicating that the influence arises from both magnetic susceptibility and relaxation time of the system. At last, a single equation able to express the temperature versus time profile of a ferrofluid, when SAR is virtually temperature independent, is proposed up to the equilibrium condition. [less ▲]

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See detailStoner–Wohlfarth model for the anisotropic case
de Campos, Marcos Flavio; da Silva, Fernanda Sampaio; Perigo, Elio Alberto UL et al

in Journal of Magnetism & Magnetic Materials (2013), 345

The Stoner–Wohlfarth (SW) model was calculated for the anisotropic case, by assuming crystallographical texture distributions as Gaussian, Lorentzian and cos n (alpha). All these distributions were tested ... [more ▼]

The Stoner–Wohlfarth (SW) model was calculated for the anisotropic case, by assuming crystallographical texture distributions as Gaussian, Lorentzian and cos n (alpha). All these distributions were tested and both Gaussian and cos n (alpha) give similar results for Mr/Ms above 0.8. However, the use of cosn (alpha) makes it easier to find analytical expressions representing texture.The Lorentzian distribution is a suitable choice for not wel laligned magnets, or magnets with a high fraction of misaligned grains. It is discussed how to obtain the alignment degree Mr/Ms directly from two measurements of magnetic remanence at the transverse and parallel directions to the alignment direction of the magnet .It is demonstrated that even the wel laligned magnets with Mr/Ms=0.96 present coercive field of 60–70% of the anisotropy field, depending on the chosen distribution.The anisotropic SW model was used for discussing hysteresis squareness. Improving the crystalographical texture, the loop squareness also increases. [less ▲]

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