The Characteristics Of Magnets And The Properties Of Magnes

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Everyone knows what a magnet is, or what a magnet does. Magnes, the Greek Shepherd discovered Lodestone also called as Magnet. An invisible force attracts iron objects and that force is denoted as magnetic field (1). Magnetic field is the only field where the lines of force that show the direction of the field can be made visible. This will be represented in the Fiq:1. In every material in this world, there are small magnetic fields called domains. Most of the time, all these domains are independent and face different directions. All the domains can be arranged with the use of strong magnetic fields known as Ferromagnetic metals. Magnets can be either temporary or Permanent. Temporary magnets are made from materials that are easy to magnetize. But it can lose their magnetization very easily. Permanent magnets are the magnets that are very difficult to magnetize.But it can keep their magnetic properties longer than temporary magnets do. Diamagnetic materials are very weak and not permanent and it persists only while an external magnetic field is applied. It is induved by a change in the orbital motion of the electrons due to an applied magnetic field. Paramagnetic materials are also categorized as antiferromagnetic and ferrimagnetic. The magnetic moment coupling between adjacent atoms/ions results in antiparallel alignment and the alignment of spin moments is exaclty in opposite directions are termed as antiferromagnetism. Manganese oxide (MnO) displays this behaviour (2). Different types of magnetic materials available are Ferrites (Ceramics), Alnico, Samarium cobalt, Neodymium (Neo) and bonded magnets. Iron is being crucial element in earth’s crust and it is being a basic building blocks of our modern infrastructure. A challengin... ... middle of paper ... ... the apoferritin cavity (cavity naturally used for the storage of iron ions) and transported by the external magnetic field to the required site of action (62). Another mechanism by which small magnetic liposomes containing doxorubicin was prepared and delivered to osteosarcomas in hamsters and thereby minimizing primary tumor growth in that region. Interestingly, in that experiment permanent magnet of 0.4T was implanted in the tumor vasculature region of the osteosarcomas. All doxorubin preparations significantly suppressed tumor growth with the influence external magnetic force. Without magnetic force, no effect was determined. Systemic chemotherapy with doxorubicin magnetic liposomes and external magnetic force is effective for the treatment of various solid tumors. This system could provide numerous clinical effects over the existing drug delivery systems (63).

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