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How to calculate saturation magnetisation in GMR effect?

  1. Jun 10, 2015 #1
    1. The problem statement, all variables and given/known data
    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.

    2. Relevant 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##.

    3. 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.
     
  2. jcsd
  3. Jun 10, 2015 #2
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