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Dipartimento di Fisica e Scienze della Terra

 


Magnetometry and Susceptometry


Instruments ranges


The Oxford Instruments MagLab System2000 is a multi-measurement platform that allows different automated measurements to be made by a series of dedicated probes

The AC susceptibility probe allows to measure the complex magnetic susceptibility as a function of frequency, temperature and DC field; furthermore higher harmonics of the susceptibility can be detected. A special instrument configuration gives the possibility of measuring the susceptibility by compensating the earth's field.

 

The DC probe consists of an extraction magnetometer, which utilizes the same coil system as the AC probe. Moving a sample with a magnetic moment through a coil induces a voltage in that coil which is proportional both to the moment and to the speed of movement.

 

The Cantilever Magnetometry Probe (CMP) provides a sensitive instrument for the measurement of magnetic moment and magnetic torque. Cantilever magnetometry is a technique used for detecting magnetic moment by measuring the deflection of a cantilever beam or plate due to the interaction of a magnetised specimen attached to the beam, with a magnetic field.

 

The Electrical Rotating Probe (MLEPR) allows to perform electric transport measurements

Manics DSM-8 Stationary Pendulum (Magnetometer/Susceptometer)

 

working principle: measurement of the magnetic interaction force between the sample and a (horizontal) magnetic field gradient produced by the shaped pole pieces of an electromagnet

 

The instrument is designed for measuring the permanent or induced magnetic moment of small samples - powders, crystals or films - therefore allowing to perform hysteresis loops at different temperatures and also thermo-magnetic analysis (TMA).

 

Typical applications cover from weak paramagnets to ferromagnets or superconductors with a few milligram samples.

DSM8 Manics

Vibrating Wire Susceptometer

 

This instrument, which has been developed by G. Asti and M. Solzi, allows to perform high sensitivity measurements of the magnetic susceptibility in the high temperature region and under low magnetic fields. It utilizes a thin vibrating wire in tension as a sample holder, with an inductive gradient generator which consists of a soft ferromagnetic body very close to the sample. This particular solution allows to enhance the gradient while reducing the field intensity at the sample position. The measurements are performed in vacuum.

 

Typical applications are measurements of thin films, small grains and in general nanostructured materials.