Giant Magnetoimpedance Effect in Co70Fe5Si15B10and Co70Fe5Si15Nb2.2Cu0.8B7Ribbons

Phan, Manh‐Huong; Kim, Yong-Seok; Chien, Nguyen Xuan; Yu, Seong‐Cho; Lee, Heebok; Chau, N.

doi:10.1143/jjap.42.5571

Cited by 18 publications

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“…Also the larger the FWHM of the ⌬ / -H curve, the lower the magnetic response obtained, because the FWHM of the ⌬ / -H curve varies proportionally to that of the ⌬Z / Z-H curve. 9,10 It is therefore reasonable to conclude that, when compared with Co-Amor sample, the larger GMI effect of Fe-Nano sample ͑Fig. 2͒ resulted from the larger value of ⌬ / and the lower value of the resistivity; the lower value of of this sample ͑the inset of Fig.…”

Section: Resultsmentioning

confidence: 91%

Optimized giant magnetoimpedance effect in amorphous and nanocrystalline materials

Phan

Peng

et al. 2006

Journal of Applied Physics

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This letter reports the giant magnetoimpedance ͑GMI͒ effect and its magnetic response in optimized Co 70 Fe 5 Si 15 Nb 2.2 Cu 0.8 B 7 amorphous and Fe 71 Al 2 Si 14 B 8.5 Cu 1 Nb 3.5 nanocrystalline ribbons. At a given frequency of 5 MHz, the largest GMI ratios of 513% and 640% were observed for the Co-based amorphous and Fe-based nanocrystalline samples, respectively. More interestingly, the magnetic response reached the largest value of 144%/Oe at the frequency of 4 MHz for the Co-based amorphous sample and of 40%/Oe at the frequency of 5 MHz for the Fe-based nanocrystalline sample. This is ideal for high-frequency and high-performance GMI-based sensor applications. The skin effect model was used to interpret the obtained results of GMI in connection with the magnetic-field and frequency dependences of the longitudinal permeability.

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Section: Resultsmentioning

confidence: 91%

Optimized giant magnetoimpedance effect in amorphous and nanocrystalline materials

Phan

Peng

et al. 2006

Journal of Applied Physics

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“…It has been shown that conventional annealing causes a considerable reduction in the GMI effect for Co-based amorphous wires/microwires [15] and ribbons [16] due to the fluctuation of the circumferential/transverse anisotropy in the circumferential/transverse direction of the wire/ribbon. Phan et al [17,18] revealed that a suitable conventional annealing treatment (i.e., relatively low annealing temperature~300°C and short annealing time~25 min) of Co-based amorphous ribbons resulted in a significantly improved GMI effect in the frequency range of 1-10 MHz. Suitable annealing treatment is also believed to lead to the relief of internal stress while retaining the orientation of the magnetic moments in the transverse direction of the ribbon [18].…”

Section: Discussionmentioning

confidence: 99%

“…Phan et al [17,18] revealed that a suitable conventional annealing treatment (i.e., relatively low annealing temperature~300°C and short annealing time~25 min) of Co-based amorphous ribbons resulted in a significantly improved GMI effect in the frequency range of 1-10 MHz. Suitable annealing treatment is also believed to lead to the relief of internal stress while retaining the orientation of the magnetic moments in the transverse direction of the ribbon [18]. Furthermore, it was found that the magnetic softness (e.g., magnetic permeability and saturation magnetization) increased and the resistivity decreased when amorphous wire/ribbon subjected to proper conventional annealing [19,20].…”

Section: Discussionmentioning

confidence: 99%