- #1

majas

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## Homework Statement

Hello everyone. This is my first post.

I'm working now on my laboratory report from GMR effect. I have to calculate the antiferromagnetic coupling for my multilayers. I have only resistance versus magnetic field graphs.

## Homework Equations

I want to use the equation:

##J_{AF}=-\frac{\mu_0 M_S t}{4}H_S##

It's easy to find ##H_S##, ##\mu_0## and t is given, and I need ##M_S##.

## The Attempt at a Solution

I have found equation $$H_S=\frac{K}{M_S},$$ but there is next unknown K, which is the anisotropy constant, and I'm not sure how it is for permalloy which the multilayers were made.

Thank you for your help.