Role of dipolar interaction in magnetic hyperthermia

2014 ◽  
Vol 89 (1) ◽  
Author(s):  
Gabriel T. Landi
Nanoscale ◽  
2015 ◽  
Vol 7 (17) ◽  
pp. 7717-7725 ◽  
Author(s):  
M. Campanini ◽  
R. Ciprian ◽  
E. Bedogni ◽  
A. Mega ◽  
V. Chiesi ◽  
...  

Left: morphological and magnetic characterization of magnetite NPs. Right: Lorentz microscopy unveils the role of dipolar interactions in magnetic hyperthermia of superparamagnetic NPs.


2008 ◽  
Vol 8 (6) ◽  
pp. 2929-2943 ◽  
Author(s):  
D. Kechrakos ◽  
K. N. Trohidou

Assemblies of magnetic nanoparticles exhibit interesting physical properties arising from the competition of intraparticle dynamics and interparticle interactions. In ordered arrays of magnetic nanoparticles magnetostatic interparticle interactions introduce collective dynamics acting competitively to random anisotropy. Basic understanding, characterization and control of dipolar interaction effects in arrays of magnetic nanoparticles is an issue of central importance. To this end, numerical simulation techniques offer an indispensable tool. We report on Monte Carlo studies of the magnetic hysteresis and spin-dependent transport in thin films formed by ordered arrays of magnetic nanoparticles. Emphasis is given to the modifications of the single-particle behavior due to interparticle dipolar interactions as these arise in quantities of experimental interest, such as, the magnetization, the susceptibility and the magnetoresistance. We investigate the role of the structural parameters of an array (interparticle separation, number of stacked monolayers) and the role of the internal structure of the nanoparticles (single phase, core–shell). Dipolar interactions are responsible for anisotropic magnetic behavior between the in-plane and out-of-plane directions of the sample, which is reflected on the investigated magnetic properties (magnetization, transverse susceptibility and magnetoresistance) and the parameters of the array (remanent magnetization, coercive field, and blocking temperature). Our numerical results are compared to existing measurements on self-assembled arrays of Fe-based and Co nanoparticles is made.


2021 ◽  
Vol 15 (4) ◽  
Author(s):  
Daniela Paola Valdés ◽  
Enio Lima, ◽  
Roberto Daniel Zysler ◽  
Gerardo Fabián Goya ◽  
Emilio De Biasi

2019 ◽  
Vol 5 (9) ◽  
pp. eaax7163 ◽  
Author(s):  
Alessandro Lunghi ◽  
Stefano Sanvito

The coupling between electronic spins and lattice vibrations is fundamental for driving relaxation in magnetic materials. The debate over the nature of spin-phonon coupling dates back to the 1940s, but the role of spin-spin, spin-orbit, and hyperfine interactions has never been fully established. Here, we present a comprehensive study of the spin dynamics of a crystal of Vanadyl-based molecular qubits by means of first-order perturbation theory and first-principles calculations. We quantitatively determine the role of the Zeeman, hyperfine, and electronic spin dipolar interactions in the direct mechanism of spin relaxation. We show that, in a high magnetic field regime, the modulation of the Zeeman Hamiltonian by the intramolecular components of the acoustic phonons dominates the relaxation mechanism. In low fields, hyperfine coupling takes over, with the role of spin-spin dipolar interaction remaining the less important for the spin relaxation.


2017 ◽  
Vol 17 (5) ◽  
pp. 2323-2332 ◽  
Author(s):  
Ilona S. Smolkova ◽  
Natalia E. Kazantseva ◽  
Vladimir Babayan ◽  
Jarmila Vilcakova ◽  
Nadezda Pizurova ◽  
...  

2021 ◽  
Vol 3 ◽  
Author(s):  
Tiê Menezes Oliveira ◽  
Fernanda Costa Brandão Berti ◽  
Sidney Carlos Gasoto ◽  
Bertoldo Schneider ◽  
Marco Augusto Stimamiglio ◽  
...  

The use of biomaterials in medicine is not recent, and in the last few decades, the research and development of biocompatible materials had emerged. Hydroxyapatite (HAp), a calcium phosphate that constitutes a large part of the inorganic composition of human bones and teeth, has been used as an interesting bioceramic material. Among its applications, HAp has been used to carry antitumor drugs, such as doxorubicin, cisplatin, and gemcitabine. Such HAp-based composites have an essential role in anticancer drug delivery systems, including the treatment of osteosarcoma. In addition, the association of this bioceramic with magnetic nanoparticles (MNPs) has also been used as an effective agent of local magnetic hyperthermia. Further, the combined approach of the aforementioned techniques (HAp scaffolds combined with anti-tumor drugs and MNPs) is also an attractive therapeutical alternative. Considering the promising role of the use of bioceramics in modern medicine, we proposed this review, presenting an updated perspective on the use of HAp in the treatment of cancer, especially osteosarcoma. Finally, after giving the current progress in this field, we highlight the urgent need for efforts to provide a better understanding of their potential applications.


2017 ◽  
Vol 5 (24) ◽  
pp. 4587-4594 ◽  
Author(s):  
P. Guardia ◽  
S. Nitti ◽  
M. E. Materia ◽  
G. Pugliese ◽  
N. Yaacoub ◽  
...  

To produce Au–FexOy dimers with outstanding heating performances under clinical magnetic hyperthermia conditions, here we report two synthesis routes, a two-pot and a one-pot method.


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