TAILIEUCHUNG - Magnetic Material Engineering - Chapter 6: Applications in Medical and Biology

Normally, any ferromagnetic or ferrimagnetic material undergoes a transition to a paramagnetic state above its Curie temperature. Superparamagnetism is different from this standard transition since it occurs below the Curie temperature of the material. Superparamagnetism occurs in nanoparticles which are single domain. This is possible when their diameter is below 3–50 nm, depending on the materials. In this condition, it is considered that the magnetization of the nanoparticles is a single giant magnetic moment, sum of all the individual magnetic moments carried by the atoms of the nanoparticle | Magnetic Material Engineering Chapter 6: Applications in Medical and Biology Magnetic Material Engineering Magnetic Material Engineering Chapter 6: Applications in Medical and Biology Magnetic nanoparticles Magnetic Material Engineering Chapter 6: Applications in Medical and Biology Magnetic nanoparticles Magnetic Material Engineering Chapter 6: Applications in Medical and Biology Magnetic nanoparticles Magnetic Material Engineering Chapter 6: Applications in Medical and Biology Magnetic nanoparticles Materials: Fe, Co, Ni, Gd Spins of unfilled d-bands spontaneously align parallel inside a domain below a critical temperature TC (Curie) Laws: B = H +4 H M = H : Susceptibility Magnetic Material Engineering Chapter 6: Applications in Medical and Biology Magnetic nanoparticles Hard Magnets: HC and Mrs have high values Magnetic Material Engineering Chapter 6: Applications in Medical and Biology Superparamagnetism - a size effect Magnetic Material Engineering Chapter 6: Applications in Medical and Biology Superparamagnetism - a size effect Superparamagnetism: • high saturation magnetisation MS • no remanence MR = 0 Magnetic Material Engineering Chapter 6: Applications in Medical and Biology Superparamagnetism The Néel relaxation in the absence of magnetic field Normally, any ferromagnetic or ferrimagnetic material undergoes a transition to a paramagnetic state above its Curie temperature. Superparamagnetism is different from this standard transition since it occurs below the Curie temperature of the material. Superparamagnetism occurs in nanoparticles which are single domain. This is possible when their diameter is below 3–50 nm, depending on the materials. In this condition, it is considered that the magnetization of the nanoparticles is a single giant magnetic moment, sum of all the individual magnetic moments carried by the atoms of the nanoparticle. Magnetic Material Engineering .

• Vật lý
• Magnetic Material Engineering
• Magnetic Material Engineering in Medical
• Magnetic Material Engineering in Biology
• Magnetic nanoparticles
• nanomagnetic particle
• Magnetic Materials and Applications
• Giant magnetoresistance
• Magnetic sensors
• RF sputtering
• Spin valve
• Advanced materials and devices
• Design of high density transformers
• High frequency high power converters
• High power converter applications
• Conventional high frequency magnetic materials
• Characteristics of nanocrystalline materials
• Transformer specifications of the PRC operation
• Handbook of mechanical engineering
• mechanical engineering
• mechanical design
• mechanical materials
• alloy materials
• Energy Technology