Diamagnetism

Diamagnetism is the property of materials that are repelled by a magnetic field; an applied magnetic field creates an induced magnetic field in them in the opposite direction, causing a repulsive force. In contrast, paramagnetic and ferromagnetic materials are attracted by a magnetic field. Diamagnetism is a quantum mechanical effect that occurs in all materials; when it is the only contribution to the magnetism, the material is called diamagnetic. In paramagnetic and ferromagnetic substances, the weak diamagnetic force is overcome by the attractive force of magnetic dipoles in the material. The magnetic permeability of diamagnetic materials is less than the permeability of vacuum, μ0. In most materials, diamagnetism is a weak effect which can be detected only by sensitive laboratory instruments, but a superconductor acts as a strong diamagnet because it entirely expels any magnetic field from its interior (the Meissner effect). Diamagnetism was first discovered when Anton Brugman

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Magnetic properties of CeAlSi and CeAlGe

Lorenzo Berardo

This TPIV experiment deals with first measurements of CeAlSi and CeAlGe magnetic properties and allows to a comparison between these last two. The first step is a description of MPMS measurement, then the paramagnetism and ferromagnetism theory leads to an essential knowledge for the future analysis of principal magnetic phenomenon. Turning now to practical aspects, this experiment investigates the CeAlSi and CeAlGe magnetization depending on the temperature and on the mag- netic field, which allows to the determination of the Curie-Weiss temperature, the transition temperature and the effective magnetic moment of this two alloys. The study of magnetization as function of the magnetic field shows hysteresis and paramagnetic regimes for both compounds; Brillouin fit has been taken in account. Analytical methods, used to calculate previous above parameters, are given in this report.

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