Relaxation of Magnetic Nanoparticle Chain without Applied Field

Abstract

The relaxation of a one-dimensional magnetic nanoparticle linear chain with lattice constant a is investigated in absence of applied field. There is an equilibrium state (or steady state) where all magnetic moments of particles lie along the chain (x-axis), back to which the magnetic nanoparticle chain at other state will relax. It is found that the relaxation time Tx is determined by Tx = 10 β × a 3 . This relaxation is compared with that of single magnetic nanoparticle system.

Magnetic particle hyperthermia: Power losses under circularly polarized field in anisotropic nanoparticles

“…[7]. Let us note the formation of chains by nanoparticles is a known feature of ferrofluids and the chains of particles represents a very large anisotropy [21]. Therefore, in this section we discuss the solution of the LLG equations [Eq.…”

“…However, the study of energy losses in case of the linearly polarized applied field for anisotropic nanoparticles enables us to consider whether the large anisotropy can be used to explain the experimental results of [7]. Let us note the formation of chains by nanoparticles is a known feature of ferrofluids and the chains of particles represents a very large anisotropy [21]. Therefore, in this section we discuss the solution of the LLG equations (1) obtained for a single-domain magnetic nanoparticle under linearly polarized, i.e.…”

Effect of polydispersity to specific absorption rate

“…Furthermore, efficiency of circularly polarized field opposed to linearly polarized field is also investigated by models [6][7][8][9][10][11][12] and experiments [13,14] as well. An interesting study of the chain formation of nanoparticles can be read in the paper of He [15], examining the possibility of data storage.…”