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Magnetization of Raw Iron?

  1. Nov 9, 2013 #1
    The "area" of the hysteresis loop depends on the coercivity, the coercivity of raw iron(Wrought iron) is 2 Oe(160 A/m).

    If 1 gauss = 103/ 4∏ = 79.58 A/m(I'm not sure about this, source (under "General working conversions" page 2)).

    A field of 2 gauss can magnetize/demagnetize this material?!
    The work done is amazingly diminutive!
    Is this right?!

    I imagine the hysteresis loop being extremely narrow, which makes sense since most "soft" iron materials are like that. They are easy to magnetize and demagnetize.
    Last edited: Nov 9, 2013
  2. jcsd
  3. Nov 9, 2013 #2


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  4. Nov 9, 2013 #3
    I assumed 2 gauss = 160 A/m based on the conversion table present in the source, I must review this.
    What about the coercively of raw iron? When it's equal to 160 A/m is that considered to be a small value?
    It has the tendency to become magnetized and de-magnetized easily?

    I don't have any perspective of this, because I'm new at this subject. However, when comparing it to Neodymium-iron-boron I realize the major difference.
    neodymium-iron-boron = 9x105 A/m.
    Last edited: Nov 9, 2013
  5. Nov 10, 2013 #4


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  6. Nov 10, 2013 #5
    This is absolutely phenomenal, soft iron's coercivity is from 0.20 A/m and hard iron are 45 kA/m.
    It's super super easy to magnetize and de-magnetize soft iron, it's as if the energy required to do so is "nothing". haha :biggrin:

    Now I understand why we require mind boggling amounts of energy to make some strong magnets. Is to create such powerful field strengths.
    Thank you for this.
  7. Nov 11, 2013 #6
    UltrafastPED, is 1 Gauss = 79 A/m? Is this statement true?
  8. Nov 11, 2013 #7
  9. Nov 11, 2013 #8
    I'm trying to gain some perspective here, is 160 A/m a strong field? Does a solenoid require a lot of power to create such a field strength? Based on the link you shared(Thanks btw,) the current required to create such a field is 5 A, at 1 cm! Thats a lot of current for such a small wire.

    I assume it's something weak, simple to create and a small solenoid with less than a 1W of power can create it. Comparing it with stronger solenoid used to manufacture permanent magnets that consume above 10kW of power to create a highly powerful field.
  10. Nov 12, 2013 #9
    If H = 160 A/m(2 Oe), is that a lot/strong?
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