The electromagnetic nature of nanoparticles (based on nano-micro-electronics PHD
Researcher and author: PhD student Afshin Rashid
Note: The electromagnetic nature of nanoparticles in magnetic materials, molecules and their constituent atoms have electromagnetic properties. Simply put, elements such as iron, cobalt, nickel, and their alloys are absorbed by the magnet . It is called magnetic material.
The classification of electromagnetic materials is based on the magnetic acceptability (material's magnetization capability). Based on this, the materials are classified into three groups: ferromagnetic, paramagnetic and diamagnetic. The resultant dipole moment in the material diamagnetic electromagnetic zero and in the presence of a magnetic field, torque bipolar instilled in them; but to the dipole induced against the external magnetic field that causes matter of (diamagnetic) of the magnetic field disposal Be. By removing the external magnetic field, the magnetic property of these materials does not remain. The magnetic acceptability of these materials is negative and very low (about 6-10 - up to 3-10). All gases (except oxygen) are water, silver, gold, copper, diamonds, graphite, bismuth, and many organic compounds ( diamagnetic). Magnetic poles In paramagnetic matter, they do not have a clear and regular orientation; therefore, these materials do not have magnetic properties. If they are placed inside a magnetic field, they become regular along the lines of the magnetic field. By removing the magnetic field , the magnetic dipoles return quickly to their previous state in the absence of the field. Thus, paramagnetic materials have strong magnetic properties in nanoroelectric fields. The positive value of electromagnetic susceptibility (about 6-10 to 1-10. (Manganese, platinum, aluminum, alkali metals and alkaline earth oxide nano-paramagnetic oxygen and nitrogen , such as paramagnetic material is there. Ferromagnetic materials with a difference That a set of magnetic dipoles are in the same direction as the sets themselves. They are placed in different directions and directions, so that they neutralize each other's field effect. This set of magnetic dipoles, which are in the same direction, is called the nanoelectromagnetic field. The nanoelectromagnetic property of the particles of these materials depends on the rapid change of direction of these fields and their position in the direction of the field
The magnetic property depends to a large extent on the particle size . Each magnetic substance in the mass state is composed of magnetic fields. Each sphere has thousands of atoms in which the electrons rotate in the same direction and the magnetic moments are directed in parallel . But the direction of rotation of the electron in each domain is different from other domains . Whenever a large magnetic field directs all magnetic fields, a change in the nanoelectrical phase of the magnet occurs and the magnetization reaches saturation . Any particle that contains only one sphere can be considered a nanoparticle. Magnetic nanoparticles have a small number of domains and are easier to magnetize .
Conclusion:
In ferromagnetic materials, when the particle size is smaller than a single magnetic field, the phenomenon of paramagnetic cloud (non-connection of nanoparticles in nanoscale under normal conditions and their high sensitivity to the magnetic field ) occurs. Because nanoparticles do not require much force to be magnetized, they are not far from normal and, after being magnetized, do not have much of a tendency to lose their magnetic properties and return to their original state.