we understood from the lecture that magnetisation is " a measure of how a material act when a magnetic field is applied to it" . Also, i found this website that includes many information about magnetisation and answered in more detail the question of what happen to an atom/ion in a uniform magnetic field?
http://physics.unl.edu/~tsymbal/teaching/SSP-927/Section%2015_Magnetic_Properties_1.pdf
Sign of susceptibility
ReplyDeleteIf χ is positive, the material can be paramagnetic . In this case, the magnetic field in the material is strengthened by the induced magnetization. Alternatively, if χ is negative, the material is diamagnetic. As a result, the magnetic field in the material is weakened by the induced magnetization. Generally, non-magnetic materials are said para- or diamagnetic because they do not possess permanent magnetization without external magnetic field. Ferromagnetic, ferrimagnetic, or antiferromagnetic materials, which have positive susceptibility, possess permanent magnetization even without external magnetic field.
thanks for the information...it was useful.
ReplyDelete