Magnetization Curves, Demagnetizing Factors, and Domain Distributions, and Their Dependence on the Method of Demagnetization in Single Crystals and Polycrystal of 0.5 Percent Aluminium Iron

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  • 0.5%アルミニウム鉄の単結晶及び多結晶の磁化曲線，反磁場係数，及び磁区分布とそれらに対する消磁方法の影響
  • 0.5 アルミニウムテツ ノ タンケッショウ オヨビ タケッショウ ノ ジカ キョクセン , ハン ジバ ケイスウ , オヨビジクブンフ ト ソレラ ニ タイスル ショウジホウホウ ノ エイキョウ

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Abstract

The magnetization curve, the ballistic demagnetization factor (as defined with respect to the break point of the descending hystress curve), N, and the domain distribution were studied at ordinary temperatures, using the ballistic method, with single crystal and polycrystal rods of iron containing 0.53%Al and 0.018%C in thermally demagnetized (TD) state and in alternating-current demagnetized (AD) state. From comparison of the magnetization curves in TD and AD states, it has been found that, in both of single crystal and polycrystal specimens and irrespective of crystal orientation, NTD>NAD>Na, where Na is Shuddemagen’s demagnetization factor. This fact suggests that the domain distributions in TD and AD states are different in such a way that, in TD state, the volume of domains magnetized along the direction of easy magnetization far from the rod axis of the specimen is larger than that of domains magnetized along the direction of easy magnetization near the rod axis. This may be interpreted by the idea that TD and AD induce additional small uniaxial magnetic anisotropies with positive and negative anisotropy constants, respectively.

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