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FeCoB계 아몰퍼스 자성박막의 임피던스효과에 관한 연구
서강수,정승우,임재근,신용진 명지대학교 대학원 1997 대학원논문집 Vol.1 No.-
In this paper, we has studied frequency dependence of impedance of FeCoB amorphous magnetic films. First, we investigated optimal composition and sputtering conditions for fabrication of zero magnetostrictive amorphous magnetic films. (Fe_(1-x)Co_x)_79Si_2B_19 was selected as the basic composition and then, the films were fabricated with x=0.94 and 0.95 respectively by using sputtering method at high frequency. In order to relieve the internal pressure and derive the magneto-anisotropic. we annealed the films in about 150[Oe] of magnetic field and in the range(280℃, 300℃ and 320℃ respectively) of crystallization temperature(360℃). In addition, we annealed the films under non-magnetic field and near crystallization temperatures (283℃/30min, 400℃/30min and 400℃/1hr respectively) in order to decrease magnetoanisotropic. Then, we investigated magnetic properties including magneto-impedence and inductance. As the results, we found excellent magnetic characteristics and high impedence changing rate(4.52[%/Oe]) when we fabricated a sample under the condition that input power 400[W], Ar gas pressure 6.4[mTorr]. sputtering time 30[min] and annealing time 30[min] at 300[℃] in 150[Oe] magnetic field Especially, the impedence changing rate which was basic characteristic of Ml element was 4.52[%/Oe] for x=0.94. Moreover, the inductance values of the samples annealed at 400[℃/30min] were higher by 132[%] to 197[%] than those of the non-annealed samples. In addition, the quality factor Q was below 0.7 for all samples. Consequently, we find that the zero magnetostrictive amorphous magnetic film can be used as a magnetic sensor material.
신용진,임재근,서강수 明知大學校 産業技術硏究所 1996 産業技術硏究所論文集 Vol.15 No.-
In this paper we prove through the experiments the possibility that Co amorphous magnetic films can be used as high sensibility materials. We fabricate amorphous film of Fe4.7Co74.3Si2B19 by using sputtering mathod at high frequency. Then, we not only measure the magnetic properties of the annealed samples, but also observe the magnetic domain by using an Kerr effect optical microscope. As the result we find that the samples have high sensibility.
Co-계비정질 리본의 자기특성에 미치는 열처리 효과에 관한 연구
조치현,신용진,문현욱,서강수 明知大學校 産業技術硏究所 1993 産業技術硏究所論文集 Vol.12 No.-
This thesis describes the effect of annealing on the magnetic properties of Co-bsaed amorphous. The basic composition of the chosen samples were Co82Si2B15 of zero magnetostriction. The sample was melted in the quartz tube with 0.5[mm∮) nozzle. and the single roll technique was used to make a amorphous ribbon, under Ar-gas pressure 0.6〔kg/cm2] and ro11 speed 28[m/sec]. The average width and thickness of sample ribbons 2.4[mm] and 45(㎛). The sample ribbons were annealed to improve the magnetic properties at temperature of 325,350,375,400 and 450℃ respectively, for 15,30,45,60 and 120 [min] at each temperature. And I have measured high per meability of 8,000∼ 13,000 through the annealed amorphous ribbons. Especially, when the amorhpous samples were annealed at 325 for 45min, the permeability of the ribbon was 13,589. Consequently. I had effects of the improvment of permeability and the average loss at the low-frequency region.
崔熙太,愼鏞璡,徐康壽 明知大學校 産業技術硏究所 1989 産業技術硏究所論文集 Vol.8 No.-
This paper is studied on the measurement of magnetostriction of an alloy ribbons tensile force, via measuring the response ar the double frequency of the driving field frequency. The experiments with both crystalline magnetic material,(??)-Fe and amorphous magnetic material. ??, proved that the possibility in this paper can measure magnetostriction with ease and high accuracy.