Ms (saturation magnetization) of permalloy is around 1 tesla.......

It depends on composition of permalloy (ratio Ni vs. Fe). typically between 1T and 1.6T= \mu0 Ms.

sincerely

Try these references if you need more detail than the good answers given above:

http://coefs.uncc.edu/mnoras/files/2013/03/Transformer-and-Inductor-Design-Handbook_Chapter_2.pdf

http://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=9&ved=0ahUKEwj-9pas87XKAhUFDg8KHYg2BX4QFghBMAg&url=http%3A%2F%2Fwww.mag-inc.com%2FFile%2520Library%2FProduct%2520Literature%2FStrip%2520Wound%2520Core%2520Literature%2Ftwc-s3.pdf&usg=AFQjCNGzY-VgIV8cF5_swT8BsSQ_1pbulQ&sig2=Jt8Lp1uX11fbZcwgIVDYAg&cad=rja

Regards

Paul

It depends on the number of magneic atoms including  in mass of  1g of your material

( MuB/g)

it depends on the microstructure of the alloy. For a selected alloy, the saturation point varies by microstructural changes that obtained by different heat treatment. y

For Example Pearlitic, and martensitic microstructures of a alloy have different magnetic property.

Hello Clara Johanna !

This will depend on the thickness of your permalloy, see the article.

Reference: The saturation magnetization, 4πMs, and the magnetostriction constant, λ, of Ni81Fe19, Ni81Fe19/Ta and Ni72Fe17Rh11/ Ta thinfilms were studied as a function of film thickness before and after annealing. For films of thickness t < 200 Å, 4πMs, and λs were found to be strongly dependent on film thickness with even larger variation after annealing. Auger depth profiles have shown the existence of inhomogeneous interfacial layer at the film surface, Ta/film and film/substrate interfaces. The presence of such layers of different composition and magnetic properties from the film bulk, can explain the observed behavior of 4πMs and λs.

Article THICKNESS DEPENDENCE OF MAGNETIZATION AND MAGNETOSTRICTION O...