ABSTRACT
This chapter discusses different characterisation techniques related to magnetic properties of materials. It begins with elucidation of magnetic spectroscopic techniques namely nuclear magnetic resonance spectroscopy, electron spin resonance spectroscopy and Mossbauer spectroscopy techniques. Classically, a nucleus is considered as a spinning positive charge amounting to electric responsible for creating magnetic field. The main reason to employ Nuclear Magnetic Resonance to unfold molecular structure is the dependence of the resonance frequency on the chemical environment of the nucleus in a molecule. The energy of the gamma rays emitted in the nuclear transition will depend on the difference in the energy levels and hence on the splitting. The spinning nucleus will have angular momentum. Just as a spinning top processes in gravitational field, this nucleus will also undergo precession under the influence of torque exerted by the external magnetic field.
