飽和漸近則における測定印加磁場の影響

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  • Effects of the Applied Magnetic Field for Measurements in the Law of Approach to Ferromagnetic Saturation (LAFS)
  • ホウワゼンキンソク ニ オケル ソクテイ インカ ジバ ノ エイキョウ

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<p>Law of approach to ferromagnetic saturation (LAS) can be applied to isotropic magnet samples having either uniaxial anisotropy or cubic symmetry. Using the magnetization curves of samples, the relationships between polarization (J) and (1/H2, H; applied field) or between susceptibility (dJ/dH) and (1/H3) are able to obtain. The magnetic anisotropy field (Ha) and saturation polarization (Js) can be calculated using the slope and the intercept in the obtained relation lines. We found that the obtained Js and Ha using above two relationships agree well when the applied field for magnetization measurements is sufficiently large that corresponds to the Ha of measured sample, >2.0 MA/m for Sr-ferrite. The above result was tried to apply to high anisotropy sample of newly developed (Nd0.7Zr0.3)(Fe0.75Co0.25)11.5Ti0.5N1.3 having ThMn12 structure, and it was confirmed that the applied field (Happl) of more than about 6.7 MA/m gave the nearly same Js and Ha of 1.67 T and 5.85 MA/m, respectively, using the above two relationships.</p>

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