• Title/Summary/Keyword: 결정립 성장

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A Study on the Magnetic Properties and Microstructure of CoCr Thin Films Growing under Magnetic Field (자장하에서 성장한 CoCr박막의 자기적 특성 및 미세구조에 관한 연구)

  • Lee, Yu-Gi;Jang, Pyeong-U;Lee, Taek-Dong;Lee, Gye-Won
    • Korean Journal of Materials Research
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    • v.4 no.5
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    • pp.581-589
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    • 1994

  • Magnetic properties and microstructures of the $Co_{83}Cr_{17}$ films growing under the applied magnetic field were studied. In comparison, those of the films growing without magnetic field were also studied. Magnetic field does not affect saturation magnetization and in-plane coercivity of the films. On the contrary perpendicular coercivity and effective perpendicular anisotropy field decreased. Grain size and the thickness of the so-called transition layer were not affected and the C-axis alignment of the films was slightly deteriorated due to magnetic field. Also, microstructures of the sputtered films showed larger grain sizes of strong (002) preferred orientation for thicker film specimens independent of applied magnetic field.

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Grain orientation distribution of the ZrB $_{2 }$ - ZrCcomposite sintered by the different sintering technique (소결방법에 따른 ZrB $_{2 }$ - ZrC 복합체에서의 결정립 방위 분포의 변화)

  • ;Y. Yasutomi;Y. Takigawa;H. Yanagida
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.10 no.2
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    • pp.152-158
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    • 2000

  • The crystallographic grain orientation of {{{{ { ZrB}_{2 } }}}}-ZrC composite sintered by pressureless a sintering(PLS) and spark plasma sintering (SPS) was analysed by the SEM-EBSP technique. In the case of PLS, (160) plane of {{{{ { ZrB}_{2 } }}}} was oriented to ND direction, (101) and (111) plane of ZrC were oriented to ND direction. In the case of SPS, (0001) plane of {{{{ { ZrB}_{2 } }}}} was strongly oriented to ND direction. Only (001) plane of ZrC was oriented to ND direction. The PLS specimen had weakly oriented grain structure and interface between {{{{ { ZrB}_{2 } }}}} and ZrC was found to be more stable than that of SPS but the SPS specimen had a preferentially oriented grain structure.

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Effect of $Co_{73}Cr_{27}$ Seed Layer on the Crystalline Alignment and Microstructure in CoCr Thin Films ($Co_{73}Cr_{27}$ 씨앗층이 CoCr 박막의 결정배향성 및 미세구조에 미치는 영향)

  • 이유기;이택동
    • Journal of the Korean Vacuum Society
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    • v.3 no.1
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    • pp.45-50
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    • 1994

  • CoCr 박막에 있어서 C축 결정배향성과 미세구조 변화에 대한 Co73Cr27 씨앗층의 영향이 조사되 었다. 기록밀도가 높고 재생전압도 높은 CoCr 수직기록매체를 개발하기 위해서는 CoCr층의 두께가 엷 으면서 결정배향성이 우수하고 결정립 크기가 적고 균일한 자성기록막 제조가 필요하다. CoCr 단층막 또는 CoCr/퍼말로이 이중막 제조에서 500$\AA$정도의 Co73Cr27 층을 씨앗층으로 만들어 줌으러써 기록층인 CoCr 박막이 $0.2mu$m의 두께에서도 천이층이 거의 없고 결정배향성이 우수한 자성막을 제조할 수 있었 다. 또한 Co73Cr27 씨앗층은 비록 결정립 크기는 증가시켰지만 기록층의 에피택시 성장에 보다 바람직 한 것으로 조사되었다.

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A Study on the exchange anisotropy and the giant magnetoresistance of Mn-Ir/Ni-Fe/buffer/Si with various buffer layers (Mn-Ir/Ni-Fe/buffer/Si 다층박막에서 하지층에 따른 교환이방성 및 거대자기저항에 대한 연구)

  • 윤성용;노재철;전동민;박준혁;서수정;이확주
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.9 no.5
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    • pp.486-492
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    • 1999

  • The purpose of this research was to find out what is the dominant factor determining the $H_{ex}$ and the $H_C$ of Mn-Ir/Ni-Fe multilayers with different buffer layers. Regardless of (111) texture of Mn-Ir layer, all samples showed over the $H_{ex}$ of 155 Oe. We found out the $H_{ex}$ and the $H_C$ of Mn-Ir/Ni-Fe multilayers depend on interface morphology and grain size of Mn-Ir layer at the interface between Mn-Ir and Ni-Fe layers. The dependence of magnetroesistance ratio and coupling field on the thickness of ferromagnetic layer, thickness of Cu layer and different buffer layers have been studied. Maximum magnetoresistance ratio appeared for the sample Ta(5 nm)/Mn-Ir(10 nm)/Ni-Fe(7.5 nm)/Cu(2 nm)/Ni-Fe(6 nm)/Ta(5 nm)/Si. Magnetoresistance ratio may be related to grain of ferromagnetic layer. Coupling field may be related to the roughness and the grain size of ferromagnetic layer in the spin-valve multilayers.

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