CÁC BÀI BÁO KHOA HỌC 06:03:15 Ngày 18/01/2020 GMT+7
Giant magnetoimpedance effect in Co70Fe5Si15B10 and Co70Fe5Si15Nb2.2Cu0.8 B7 ribbons

Giant magnetoimpedance (GMI) effect has been observed in Co70Fe5Si15B10 and Co70Fe5Si15Nb2.2Cu0.8 B7 melt-spun amorphous ribbons. The magnetoimpedance (MI) of these samples has been studied up to a frequency of 10 MHz and varying a dc magnetic field (Hdc) within 150 Oe. A maximum change of 89% in MI has been observed for Co70Fe5Si15Nb2.2Cu0.8 B7 composition around a frequency of 3.1 MHz. Substitution of Cu and Nb for B in an initial Co70Fe5Si15B10 composition forming the Co70Fe5Si15Nb2.2Cu0.8 B7 composition not only favors the GMI effect but also gives rise to the sensitivity of the magnetic response (∼18%/Oe), which is very beneficial for magnetic sensors applications. The GMI effect for both samples annealed at 550 K is further enhanced due to the presence of the ultrasoft magnetic materials, compared to their as-quenched samples.

 Phan M.-H., Kim Y.-S., Chien N.X., Yu S.-C., Lee H., Chau N.
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  Từ khóa : Amorphous alloys; Electric conductivity of solids; Giant magnetoresistance; Magnetic fields; Magnetic hysteresis; Magnetometers; Nanostructured materials; Quenching; Soft magnetic materials; X ray diffraction analysis; Giant magnetoimpedance effect; Magnetic sensor; Ultrasoft magnetic material; Cobalt alloys