Soft Magnetic Properties of Fe-Ni-Nb Alloy Films
The relation between the soft magnetic properties and local anisotropy fluctuation measured by the dynamic differential susceptibility method in Fe-Ni-Nb alloy films was clarified and discussed in comparison with Fe-Si-Al alloy films. Fe-Ni-Nb alloy films with excellent soft magnetic properties, 5 MHz values of ¿eff = 6500 for 1000 Å thick films were obtained. For Fe-Si-Al alloy films, the magnitude of ¿eff = 6500 is proportional to 1/S2 (where S is a structure constant) and independent of the value of Hk, while for Fe-Ni-Nb alloy films, the value of S is about one-tenth of that in Fe-Si-Al alloy films, and the magnitude of ¿eff 6500 does not depend on S. Rather, this magnitude is dependent on the value of Hk, and is almost equal to 4¿Ms/Hk, obtained from a rotational magnetization model in a uniaxial single-domain particle.
FeZrBM (M=Co, Ni, Cr, V) スパッタ膜の軟磁気特性
Soft magnetic properties of sputtered FeZrB films are investigated with additives of Co, Ni, Cr, and V. While FeZrB ternary films did not exhibit soft magnetic properties in our experiment, a few percent of additives make permeability high enough for magnetic head applications. These changes correspond to the variation of magnetostriction of the films. Any additive mentioned above makes magnetostriction constant positive from negative value of FeZrB film. However, the effects of Co or Ni addition on crystallization are different from those of Cr or V addition. By addition of Co or Ni, crystallization temperature (Tx) becomes lower, lattice spacing (Ls) larger. and saturation magnetic flux density (Bs) higher, while Cr or V makes Tx higher, Ls smaller, and Bs lower. In the aspect of soft magnetic properties, Co is the best additive of the four elements, and Fe87.6Co3.2Zr5.8B3.3 exhibits excellent soft magnetic properties after annealing at 550°C (Bs∼18 kG, μ∼5000).
Evaluation of Impact of Yarn Count and Stitch Length on Pilling, Abrasion, Shrinkage and Tightness Factor of 1 ? 1 Rib Cotton Knitted Fabrics
This study investigates the impact of yarn count and stitch length of 100% cotton knitted fabrics. 1 × 1 ribs structured fabrics were used in this research work. The stitch length 2.50 mm, 2.52 mm, 2.60 mm, 2.70 mm, 2.80 mm and 2.96 mm were used of the yarn count of 26Ne, 28Ne and 36Ne. The areal densities of the grey fabrics were in various amounts. The impacts of yarn count and stitch length were measured concerning pilling resistance, abrasion resistance, and shrinkage and tightness factor. The result showed that the fabric pilling grade decreased while number of cycle increased. Abrasion resistance decreased but length wise shrinkage increased despite the fact that the stitch length increased. The results also exposed that the tightness factor of the fabric increased with the increase of the stitch length in both dyeing and washing state and finished state compared to grey state for the yarn count 26Ne and homogeneous result not found for yarn count 28Ne and 36 Ne. Evaluation of Impact of Yarn Count and Stitch Length on Pilling, Abrasion, Shrinkage and Tightness Factor of 1 × 1 Rib Cotton Knitted Fabrics