Definition : In certain materials, each atom or molecule possesses a net permanent magnetic moment (due to the orbital and spin magnetic moments) even in the absence of an external magnetic field. or The substances which when placed in a magnetic field are weakly magnetised in the direction of the applied field, are called paramagnetic
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Definition: “Materials which does not have permanent magnetic dipoles” are termed as Diamagnetic materials. or The substances which when placed in a magnetic field become weakly magnetised in a direction opposite to that of the applied magnetising field are called diamagnetic substances. Examples: Gold, Quartz, Water, Copper, Zinc, Germanium, Silver, Lead, Silica, Helium, Bismuth etc.,
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Now, we are going to study the various types of magnetic materials in terms of the magnetic properties of the atomic dipoles and the interactions between them. Very first distinctions is based on whether the atoms carry permanent magnetic dipoles or not. Materials not having permanent magnetic moment Diamagnetic materials Materials which lack permanent dipoles
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The macroscopic magnetic properties of a substance are a consequence of magnetic moments associated with individual electrons. The electrons in an atom revolved around the nucleus in different orbits. Each electron in an atom has magnetic moments that originate from the following sources. The orbital magnetic moment of electrons (the motion of electrons in the
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Photolytic degradation is the degradation of photodegradable molecules caused by the absorption of photons, particularly those wavelengths found in sunlight, such as infrared radiation, visible light, and ultraviolet light. Some molecules get activated by the heat of light which increases the reaction rate. Drugs which get chemically degraded in the presence of light are photosensitive
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