• Title/Summary/Keyword: Magnetic domain wall

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The Magnetic Properties of FeBSiNb Alloy Ribbons with High Glass forming Ability (고 비정질 형성능을 가진 FeBSiNb 합금 리본의 자기적 특성)

  • Noh, Tae-Hwan;Kim, Gu-Hyun
    • Journal of the Korean Magnetics Society
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    • v.12 no.4
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    • pp.154-159
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    • 2002
  • Amorphous FeBSiNb alloy ribbons having bulk glass forming ability and high saturation magnetic flux density were produced by single-roller melt spinning apparatus in the thickness range of 22∼102㎛. With the increase of thickness, the coercive force and squareness ratio decreased, while maximum permeability and AC permeability increased. However electrical resistivity was almost constant. Furthermore refined and complex magnetic domain structure was observed in thicker ribbons owing to the change in internal magnetic anisotropy. For the alloy with the thickness of 81㎛, small coercive force of 24 mOe and high effective permeability of 12,000 at 1㎑ were obtained, those are considered to be better comparing to the conventional soft magnetic amorphous alloys (∼20 ㎛). The good soft magnetic properties of the thick FeBSiNb amorphous alloys were attributed to the decrease in surface pinning effect during wall motion, appearance of perpendicular anisotropy and resulted domain refinement.

CHARACTERIZATION OF MAGNETIZATION BEHAVIOR IN Co/Pd PERPENDICULAR ANISOTROPIC MULTILAYERS

  • Oh, Hoon-Sang;Joo, Seung-Ki
    • Journal of the Korean Magnetics Society
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    • v.5 no.5
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    • pp.655-658
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    • 1995
  • Magnetization behavior of sputter-deposited Co/Pd multilayers were characterized, and it has been found that even when the multilayers are sputtered at low pressure (10 mTorr), the coercivity of the multilayers can be increased to large extent without noticeable change of saturation magnetization by increasing the deposition pressure of Pd underlayer. It turned out that the surface topology of Pd underlayer gets rough as deposition pressure increases, which consequently affects the magnetization reversal mode of Co/Pd multilayers from domain wall motion to magnetic spin rotation. The enhancement of coercivity is attributed to the domain wall pinning effect which is comected with the surface roughness of Pd underlayer on which Co/Pd multilayers grow.

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