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Vol.39, No.4, 462 ~ 466, 2001

Title

Study of Magnetic Property of Fe-Base Amorphous Alloy with Evolution of the Nanocrystalline Particle using SR - XRD

고종민Jong Min Ko,김상욱Sang Uk Kim,김기홍Ki Hong Kim,구양모Yang Mo Koo

Abstract

Amorphous ribbons with composition of Fe_(73.5)Cu₁Nb₃Si_(13.5)B_9 (FINEMET) and Fe_(76)Si_(14.5)B_(9.5) used soft magnetic materials have been annealed between about 427℃ and 627℃. This annealing process produced a series of partially crystallized samples with different crystallite sizes and coercivities (H_c). The nanocrystalline structure of α-Fe(Si) embedded in an amorphous matrix was investigated by synchrotron radiation X-ray diffractometer (SRXRD). To measure the crystallite size, Fourier analysis was performed. A series of crystallite with 28 ㎚∼150 ㎚ were estimated. And then magnetic properties of the specimens were tested by vibrating sample magnetometer (VSM). In this study, we analyzed the dependency of coercivity (H_c) with crystalline size of FINEMET and Fe_(76)Si_(14.5)B_(9.5) using Fourier analysis and VSM. The best soft magnetic properties (H_c = 4.57 Oe in FINEMET and H_c = 6.98Oe in FeSiB) were observed for the smallest grain sizes of about 28 ㎚ in FINEMET and 41 ㎚ in FeSiB. With increasing crystallite size (D), coercivity was steeply increased, which was followed by the D^6-power law (up to D = 50 ㎚). The variation of the soft magnetic properties with the average grain size was discussed.

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