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Ferromagnetic hysteresis loop

  1. Jan 29, 2012 #1
    For a ferromagnetic material in the hysteresis loop, when increasing field from H=Hc, its magnetization (M) will saturate. But if we decrease field instead, will M decreases clockwise according to the loop?

    How can we make the ferromagnetic material back into the initial state (H=0, M=0)? One way is to go through TN, but some material's TN is very high. Is there any other practical method?
     
  2. jcsd
  3. Jan 29, 2012 #2

    berkeman

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    Staff: Mentor

    I'm not sure about your first question, but for the 2nd paragraph, it is common to use a "degaussing" technique to remove the residual magnetization. Degaussing uses a damped oscillatory magnetic excitation to alternately magnetize the material in opposite directions, but with a decreasing magnitude on each excursion:

    http://en.wikipedia.org/wiki/Degaussing

    .
     
    Last edited: Jan 30, 2012
  4. Jan 30, 2012 #3
    Thanks.

     
    Last edited by a moderator: Jan 30, 2012
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