• 한국자기학회지
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• 제20권4호
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• pp.129-133
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• 2010

초연자성을 띠는 코네틱(Conetic; NiFeCuMo) 박막을 상호 중간층으로 강자성체인 CoFe 또는 NiFe 박막 사이에 삽입한 코닝 유리(Corning glass)/Ta(5 nm)/[CoFe or NiFe(5 nm-t/2)]/NiFeCuMo(t = 0, 4, 6, 8, 10 nm)/[CoFe or NiFe(5 nm-t/2)]/Ta(5 nm) 3층 박막구조에 대한 자기적 특성을 조사하였다. CoFe와 NiFe 박막의 자기적 특성은 박막의 두께에 따라 크게 결정되므로 자화 곤란축과 자화 용이축으로 측정된 이방성 자기저항 곡선으로부터 얻은 보자력과 자화율을 각각 비교하였다. 특히 3층 박막구조에서 NiFe 박막 사이에 자유층으로 NiFeCuMo 박막을 삽입하면 높은 자기저항비를 유지하면서 향상된 자장감응도를 유지하는 고감도 바이오센서용 거대자기저항-스핀밸브(giant magnetoresistive-spin valves; GMR-SV) 및 자기터널접합(magnetic tunnel junction; MTJ) 소자로 활용할 수 있다.

• 한국전기전자재료학회논문지
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• 제17권8호
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• pp.888-892
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• 2004

It is necessary to develop soft magnetic layer with high saturation magnetization 4 $\pi{M}_s$ and in-plane magnetic anisotropy field Hk for soft magnetic underlayer of perpendicular magnetic recording media with high signal to noise ratio. Fe-Co-B layer with high 4 $\pi$Ms of about 23 kG deposited on Ni-Fe and Ni-Fe/Si seedlayer exhibited very high in-plane magnetic anisotropy filed Hk of about 280 and 380 Oe, respectively, In-plane XRD studies clarified that the lattice spacing of planes along the easy axis direction was longer than that along the hard axis direction in the Fe-Co-B layers with high Hk. These results indicate that high Hk of Fe-Co-B/Ni-Fe and Fe-Co-B/［Ni-Fe/si］ layers were resulted from magnetoelastic anisotropy owing to a residual stress. Moreover, the high Hk in the Fe-Co-B/Ni-Fe layer was maintained until 30$0^{\circ}C$ annealing temperature.

• 한국세라믹학회지
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• 제43권3호
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• pp.143-147
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• 2006

Co-Fe-Al-O nanogranular thin films were fabricated by RF-magnetron sputtering under an $Ar+O_2$ atmosphere. High resolution transmission electron microscopy revealed that the Co-Fe-Al-O films are composed of bcc (Co, Fe) nanograins finer than 5 nm and an Al-O amorphous phase. A very large electrical resistivity of $374{\mu}{\Omega}cm$ was obtained, together with a large uniaxial anisotropy field of 50 Oe, a hard axis coercivity of 1.25 Oe, and a saturation magnetization of 12.9 kG. The actual part of the relative permeability was measured to be 260 at low frequencies and this value was maintained up to 1.3 GHz. The ferromagnetic resonance frequency was 2.24 GHz. The resulting Co-Fe-Al-O nanogranular thin films with a high electrical resistivity and high resonance frequency are considered to be suitable for GHz magnetic device applications.