• DOI:10.5772/14978
• Corpus ID: 51744214

Using Monte Carlo Method to Study Magnetic Properties of Frozen Ferrofluid

@inproceedings{Lan2011UsingMC,
  title={Using Monte Carlo Method to Study Magnetic Properties of Frozen Ferrofluid},
  author={Tran Nguyen Lan and Trần Ho{\`a}ng Hải},
  year={2011}
}

• Tran Nguyen Lan, T. Hải
• Published 28 February 2011
• Chemistry

Magnetic nanoparticles are single-domain particles of ferromagnetic or ferrite materials. Recently, magnetic nanoparticles have been applied more and more in technology, such as spintronics, magnetic recording, catalyst, and biomedicine. Therefore, experimental and theoretical studies on their magnetic properties are very important to provide essential information for individual applications. In addition, technical preparations have been developed fast, such as chemical synthesis, sputtering, or lithography. Depending on characters of assemblies, magnetic properties are different, such as twoor three-dimension, metallic or metallic oxide materials, order or disorder arrangement, surrounded by solids (granular solids) or liquids (ferrolfuids), and the magnetic or non-magnetic surrounding matrix. This leads to studying fundamental properties of magnetic nanoparticle assemblies becomes interesting. Among applicable potentials of magnetic nanoparticles, the biomedicine is a promising area, because the magnetic nanoparticles offer some great possibilities (Pankhurst et al., 2003). First, their size ranges from a few nanometers up to tens of nanometers. This means that their size can be smaller than of comparable to the size of biological entities, for example, a cell (10 – 100 μm), a virus (20 – 450 nm), a protein (5 – 50 nm) or a gene (2 nm wide and 10 – 100 nm long). Thus, they can penetrate easily into these entities. Second, these particles behave magnetic properties, so they can be controlled by an external magnetic field gradient. This opens application including the transport (drug delivery, cell separation) or immobilization (hyperthermia, contrast agent). Third, these particles can strongly resonate to a radio field. This makes them be easily excited by radio field leading, for example, heating in hyperthermia or magnetic resonance in contrast agent. A key quality to study magnetic properties of particle is magnetic anisotropy energy (MAE). However, it is very difficult to exactly observe the MAE of each particle in the assembly. We can just obtain the MAE distribution of the assembly. Usually, the MAE distribution f(EB) is deduced from the size distribution f(V) due to simplest expression of MAE, EB = KV, with K and V as anisotropy constant and volume, respectively, of each particle. However, this way does not describe the exact information of real systems. It is due to some reasons as follow. (i) The size distribution obtains from microscopy images may not coincide with the real sample. (ii) The magnetic anisotropy involves many complexities, such as surface, magneto-