• 제목/요약/키워드: local coercivity distribution

검색결과 5건 처리시간 0.026초

Pt 함량에 따른 CoCrPt 합금박막의 국소보자력 분포 변화 (Variation of Local Coercivity Distribution in CoCrPt Alloy Films with Pt Composition)

  • 임미영;최석봉;신성철
    • 한국자기학회지
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    • 제12권1호
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    • pp.20-23
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    • 2002
  • CoCrPt 합금박막의 국소보자력 분포를 400nm공간분해능으로 8000개의 국소영역을 동시에 측정할 수 있는 광자기 현미경 자력계로 관찰하였다. 시료들은 dc 마그네트론 스퍼터링 방식으로 Pt 함량을 6 at.%에서 28 at.%로 변화시키며 제작되었다. Pt 함량이 증가함에 따라 ,국소보자력 분포가 정규분포에서 비정규분포로 변화하며 국소보자력 분포폭이 증가함을 발견하였다. 투과전자현미경으로 관찰한 미세구조를 분석한 결과는 국소보자력 분포 변화가 결정립의 크기 분포 및 평균크기 변화와 깊이 연관되어 있음을 나타내었다.

Influence of Local Coercivity Variation on Magnetization Reversal Dynamics

  • Choe, Sug-Bong;Jang, Hyuk-Jae;Shin, Sung-Chul
    • Journal of Magnetics
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    • 제5권1호
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    • pp.4-8
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    • 2000
  • Local coercivity variation of Co/Pd nanomultilayers has been investigated by measuring the polar Kerr hysteresis loops of local areas of submicron size using a magnetooptic Kerr microscope system. Interestingly, the local coercivity distribution is very sensitive to an increase in the number of repeats: the $(2-{\AA}\;Co/ll-{\AA} Pd)_10$ sample showed a smooth variation of the local coercivity, while $(2-{\AA}\;Co/ll-{\AA} Pd)_18$ showed a large fluctuation. From micromagnetic considerations based on a thermally activated relaxation odel, we have found that this local coercivity variation has a crucial effect on the contrasting magnetization reversal behavior observed in those samples: dominant wall-motion far the former sample and dominant nucleation for the latter one.

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Measurements of Local Coercivity Distribution in Ferromagnetic Films Using Magneto-Optical Microscope Magnetometer (MOMM)

  • Choe, Sug-Bong;Shin, Sung-Chul
    • Journal of Magnetics
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    • 제5권3호
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    • pp.81-84
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    • 2000
  • A magneto-optical microscope magnetometer (MOMM) has been developed to simultaneously measure 2-dimensional array hysteresis loops of each local area of $320\times320-nm^2$ spots on ferromagnetic films, in addition to grabbing time-resolved domain evolution patterns. Using the system, spatial distribution of local coercivity can be quantitatively generated and then, compared directly with domain patterns grabbed at precisely the same position of a sample. It is clearly demonstrated that local coercivity distribution governs domain reversal behavior via a thermally activated relaxation process.

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