Nowadays I've found that the magnetic saturation induction values are different according to mass and size of samples. For example, the magnetic saturation values for Fe78Si9B13 are 1.52T(m=2.07mg) and 1.35T(m=3.15mg) in SQUID ＶＳＭ, respectively. Why?
I can't analyze this one. Who is familiar to SQUID VSM?
Dear Myong Chol,
Magnetization is the magnetic moment per unit volume within the material. Magnetization depends on the number density of magnetic dipole moments within material, magnitude of magnetic dipole moments within the material and the arrangement of magnetic dipole moments within the material.
M = mtotal/V.
Note. The unit of magnetization can be emu/gr or emu/cc for powder sample and thin film respectively.
In your case, We should get a comparable value even We have different mass for the measurement. It may be related to the homogeneus of your sample.
For conversion unit, this is I attach the document.
Hopefully, it can help.
Cheers,
Indra
If the material composition is reliably the same then so should be the saturation magnetization. How did you make sure you achieved saturation? Were all other parameters (e.g. temperature) the same?
Finally there could be an issue with sample geometry. In evaluating the magnetic moment of the specimen, the measured result of the effect of sample vibration/oscillation is usually being fitted to a model formula. This formula is normally a good approximation if the specimen complies with geometrical requirements (i.e. be sufficiently small, contained within a specific volume). So specimens either exceeding these size limits or being incorrectly mounted may produce unreliable results.
Maybe you apply a larger magnetic field in SQUID leading to some addition of paramagetic contributions. You should examine the slope near saturation in both case. In VSM I suppose the applied field is much smaller? From the saturation curve 'linear witha sloe ) you extrapolate to H=0.
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