|Intern fagligt projekt, 2. modul, 2006, id:224|
|Findes på RUb:|
This work investigates the magnetocaloric effect in the lanthanium manganite La0,67Ca0,22Sr0,11MnO3 (formel) by means of the so-called 3w detection technique. The aim is to determine whether the 3w detection technique is suitable for measuring the magnetocaloric effect of certain magnetic materials. An experiment is conducted by subjecting the material to an oscillating magnetic field. The oscillating magnetic field is gererated by applying a voltage to a solenoid. By means of Fourier transformation, the third harmonic is extracted from the output voltage. It is concluded that the magnetocaloric effect cannot be detected in the conducted, due to fact that the resulting third harmonic is too small to be measurable. However, an improved experimental design might make it possible to enhance the signal to a measurable level. In this case, the 3w detection technique has some advantages compared to the usual techniques used for measuring magnetocaloric effect.