Elio Alberto Perigo

Fundamentals and advances in magnetic hyperthermia

Nowadays, magnetic hyperthermia constitutes a complementary approach to cancer treatment. The use of magnetic particles as heating mediators, proposed in the 1950s, provides a novel strategy for improving tumor treatment and, consequently, patient quality of life. This review reports a broad overview about several aspects of magnetic hyperthermia addressing new perspectives and the progress on relevant features such as the ad hoc preparation of magnetic nanoparticles, physical modeling of magnetic heating, methods to determine the heat dissipation power of magnetic colloids including the development of experimental apparatus and the influence of biological matrices on the heating efficiency.

Experimental observation of magnetic poles inside bulk magnets via

The pole-avoidance principle of magnetostatics results in an angular anisotropy of the magnetic neutron scattering cross section ΣΩ dd M . For the case of a sintered Nd–Fe–B permanent magnet, we report the experimental observation of a ‘spike’ in ΣΩ dd M along the forward direction. The spike implies the presence of long-wavelength magnetization fluctuations on a length scale of at least 60nm. Using micromagnetic theory, it is shown that this type of angular anisotropy is the result of the presence of unavoidable magnetic poles in the bulk of the magnet and is related to the ≠ q 0 Fourier modes of the magnetostatic field. Thus, our observation proves the existence of such modes.

{\bf q}\ne 0

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.

Fourier modes of magnetostatic field

We report the results of a comparative study of the magnetic microstructure of textured and isotropic

On the specific absorption rate of hyperthermia fluids

\mathrm{Nd}_2\mathrm{Fe}_{14}\mathrm{B}/\alpha

Spin Structures of Textured and Isotropic Nd-Fe-B-Based Nanocomposites: Evidence for Correlated Crystallographic and Spin Textures

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How Extrinsic Is the Coercivity in NdFeB Bonded Magnets

\mathrm{Fe}

Relaxations in the metastable rotator phase of n-eicosane

nanocomposites using magnetometry, transmission electron microscopy, synchrotron x-ray diffraction, and, in particular, magnetic small-angle neutron scattering (SANS). Analysis of the magnetic neutron data of the textured specimen and computation of the correlation function of the spin misalignment SANS cross section suggests the existence of inhomogeneously magnetized regions on an intraparticle nanometer length scale, about

Synthesis and magnetic properties of Ta/NdFeB-based composite microwires

40-50 \, \mathrm{nm}

Magnetic Field and Gradient Standards Using Permanent Magnets: Design Considerations, Construction and Validation by Nuclear Magnetic Resonance

in the remanent state. Possible origins for this spin disorder are discussed: it may originate in thin grain-boundary layers (where the materials parameters are different than in the