TAILIEUCHUNG - Dissertation summary: Fabrication and magnetic characterization of Fe, Co nanoparticles prepared by high energy ball milling

Find the optimal technology parameters and components for fabricating Fe-based nanomaterials using high-energy ball milling method; clarify the relationship between technological conditions with the structural characteristics and magnetic properties of fabricated materials; assess the applicability of Fe, Fe-Co nano materials in fabricating nanocomposite magnets and magnetic induction heating. | 1 INTRODUCTION 1. The necessity of the thesis In the fields of nanomaterials magnetic nanomaterials have attracted many researchs due to the distinctive physical and chemical properties which often exhibit when their size equivalent or smaller than the size of the magnetic domain. Changes in the properties of materials are not only due to the local contribution but are also influenced by surface effects particle size effects and interactions between particles. The critical size effects affect to the magnetic state of each particle and its increases with the particle size decreases. Some examples can be mentioned such as the magnetization of particles material decreases sharply compared to the bulk material the anisotropic surface increasing the propagation of the spin wave in the material is limited by size etc. Interaction between particles can change the magnetic state of the system and thereby changing the spin recovery time of each particle. In addition interaction can also create a collective magnetic state with spin glass properties. The distinctive chemical and physical properties of magnetic nanomaterials can be mentioned as superparamagnetic state spin glass tunnelling magnetoresistance increases when the size decreases the catalyst is strengthened etc. In addition magnetic nanomaterials also have great potential for applications in many areas such as magnetic recording materials magnetic sensors emissions treatment and especially in some diagnostic and therapeutic applications in biomedical as drug-delivery cell marker heat therapy etc So these materials become interesting objects in both basic sciences and applied research. Recently not only the metal nanoparticles Fe Co and their alloys CoFe but also the other nanomaterial structures such as core- shell structure nanocomposite base on Fe Co have attracted a lot of 2 attention. With the new structures the fabrication materials are multifunctional with interesting physical effects such as exchange- .

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