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RISS 인기검색어
- 검색키워드
- 주제어 : magneto surface acoustic wave (검색결과 3 건)
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신광호,Mitsuteru Inoue 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.3
Highly magnetostrictive films, mainly iron-based amorphous, are atractive for used in functional electronic signal conditioning and sensor applications, because they show large magneto-mechanical coupling factors based on both soft magnetic properties and large magnetostrictions. We have devel- oped a magneticaly-controlable surface-acoustic-wave device (MSAW)by using a FeSiB amorphous film which is representative magnetostrictive material having both extremely soft magnetic properties and high electrical resistance. In this paper, we presented the soft magnetic properties of FeSiB amorphous films deposited on lithium-niobate substrates. A change in the coercive force with in- creasing film thickness for an abnormaly large magnetic anisotropic field was found in the films. A maximum phase shift of 9.2˚ was obtained in the fabricated magnetic surface-acoustic-wave device containing the FeSiB film.
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$({Fe_{1-x}}{Co_x})_{89}{Zr_{11}}$비정질 자성 막에서의 자기표면탄성파 속도변화 (I)
김상원,Kim, Sang-Won 한국재료학회 2001 한국재료학회지 Vol.11 No.6
쐐기형 전극 사이에 열처리전 비정질 ($Fe_{1-x}$ $Co_{x}$ )$_{89}$ $Zr_{ 11}$ (x=0~1.0) 자성막이 증착된 MSAW 소자를 구성하고 외부 인가자기장에 의한 MSAW 속도변화율을 조사하였다. 그 결과 MSAW 속도변화율은 직류 인가자기장, 구동주파수, 자성막의 두께 및 조성에 민감하게 의존하였으며, 특히 구동주파수 및 자성막의 두께가 증가할수록 증가함을 확인하였다. 열처리전 시편에서 나타난 최대 속도변화율은 x=0.8에서 얻어진 0.062%였다. The velocity changes of magneto surface acoustic wave (MSAW) have been investigated in the MSAW devices composed of wedge type transducer and as-sputtered ($Fe_{1-x}$ $Co_{x}$ )$_{89}$ $Zr_{ 11}$ (x=0~1.0)amorphous films on glass substrates. The velocity changes of devices depended sensistively on exciting frequency of MSAW, applying the DC bias magnetic field. film thickness and film composition. Particularly. it was conformed that velocity changes increased with the increase of the exciting frequency of MSAW and the thickness of magnetic films. A device deposited x= 0.8 film along the MSAW propagation direction among the devices exhibited a large velocity change of 0.062% at 8.7 MHz for the applied field of 70 Oe.
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(Fe<sub>1-x</sub>Co<sub>x</sub>)<sub>89</sub>Zr<sub>11</sub> 비정질 자성막에서의 자기표면탄성파 속도변화(II)
김상원,Kim, Sang-Won 한국재료학회 2002 한국재료학회지 Vol.12 No.4
The effect of field annealing on the velocity changes of magneto surface acoustic wave (MSAW) devices has been investigated for deposited $(Fe_{1-x}Co_x)_{89}Zr_{11}$ (x = 0~1.0) amorphous films. By means of two step field annealing at $195^{\circ}C$ for 10 minute in the magnetic field of 130 Oe, the MSAW device with x=0.4 film among the devices showed the superior velocity change of 0.1 %. This gigantic value was obtained in the DC bias field of 40 Oe at the exciting frequency of 8.7 MHz. It was confirmed that such behavior was due to the variation of differential permeability caused by an optimal stress within the magnetic film.
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