• Title/Summary/Keyword: Soft magnetics

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Effect of soft underlayer on read/write in double layered perpendicular recording media (이중층 수직기록 매체에서 read/write 특성에 미치는 soft underlayer의 효과)

  • 이성철;탁영욱;이택동;이경진
    • Proceedings of the Korean Magnestics Society Conference
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    • 2002.12a
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    • pp.180-181
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    • 2002

  • 수직기록매체에서 기록 밀도가 증가하기 위해서는 bit의 크기를 줄여야 하고, 이를 위해서는 writing head의 width와 thickness를 줄여야 한다. 그러나 head의 크기가 줄어들면 기록층의 자화를 반전시키기에 충분한 write field를 얻지 못한다. 이를 극복하기 위해 head의 tip부분을 trimming을 하여 작은 pole tip 크기를 가지면서도 큰 write field를 얻고, 여분의 magnetic field를 얻기 위해 soft underlayer를 도입하는 이중층 수직기록 매체가 제안되고 있다. (중략)

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Study on Heterogeneous Structures and High-Frequency Magnetic Properties Amorphous CoZrNb Thin Films (비정질 CoZrNb 박막의 불균일 구조와 고주파 자기특성에 관한 연구)

  • 정인섭;허재헌
    • Journal of the Korean Magnetics Society
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    • v.1 no.2
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    • pp.31-36
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    • 1991

  • Structural and compositional heterogeneities of sputter deposited, amorphous $Co_{87}Zr_{4}NB_{9}$ thin films were investigated using TEM and EDS with windowless detector. The films deposited with substrate bias and annealed in rotating magnetc field showed two amorphous phases of Co-rich region and (ZrNb)oxide-rich region, and revealed 'ultra-soft' magnetic properties. Revesible bias-responses and overdamped frequency responses, along with small Hc, Hk and Mr/Ms ratio, give the possibility of ultra-soft magnetic behavior fo CoZrNb thin films. We proposed the vortex type magnetization distribution in remanent state which was correlated with the thin film heterogeneity. Then, the ultra-soft characteristics of the compositionally heterogeneous films were explained by the spin vortices that minimized the total magnetostatic and exchange coupling energies.

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