서지주요정보
CoCrX계 수평자기기록매체의 자성특성에 미치는 비정질 FeTi 씨앗층의 효과 = Effect of amorphous FeTi seedlayer on the magnetic properties of CoCrX longitudinal magnetic recording media
서명 / 저자 CoCrX계 수평자기기록매체의 자성특성에 미치는 비정질 FeTi 씨앗층의 효과 = Effect of amorphous FeTi seedlayer on the magnetic properties of CoCrX longitudinal magnetic recording media / 강용진.
저자명 강용진 ; Kang, Yong-Jin
발행사항 [대전 : 한국과학기술원, 2003].
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소장정보

등록번호

8013989

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 03003

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

The effect of amorphous FeTi seedlayer on the magnetic properties of CoCrX(X=Pt, Ta)/Cr magnetic thin film was investigated by controlling the sputtering conditions, especially through the variation of applied bias. The application of FeTi seedlayer increased the coercivity of CoCrX/Cr magnetic thin film by more than 1000 Oe under the negative bias condition. This high coercivity increase primarily resulted from the texture change of the Cr underlayer and subsequently of the CoCrX magnetic layer. By applying bias to the FeTi seedlayer, the coercivity of CoCrX/Cr magnetic thin film decreased due to the texture change of Cr and CoCrX layer. But the bias application to the Cr underlayer CoCrX magnetic layer resulted in the increase of the coercivity of CoCrX/Cr/FeTi magnetic thin films. In case of Cr underlayer, the applied bias induced a lattice expansion and a grain growth. Substrate bias was very important factor in controlling the composition and thickness of magnetic layer, optimizing the magnetic properties. Applied bias in CoCrPtTa alloy target decreased the composition of Co by increasing the composition of Pt due to resputtering effect. But the composition of Cr and Ta little changed. Generally optimum bias was -150V in CoCrX/Cr magnetic thin film systems, but it increased to -300V on introducing FeTi seedlayer. As a result, more Pt could be incoporated into the magnetic layer, which resulted in an enhancement of the magnetocrystalline anisotropy constant. In addition to, applied bias in CoCrPtTa magnetic layer significantly decreased the deposition rate of the film. The decrease of magnetic layer thickness is important because low Mrt is desirable for high density recording. As the thickness of Cr underlayer increased, coercivity increased due to an enhancement of Co(10.0) texture and a maximum coercivity was found at the film thickness of 50nm. A CrTi underlayer in place of Cr underlayer was found to further increase the in-plane coercivity of CoCrPtTa/Cr/FeTi magnetic thin film systems: the maximum coercivity obtained was about 3300Oe for CoCrPtTa/Cr94Ti6/FeTi magnetic thin film systems. The lattice matching of CrTi underlayer with Co films was better than that of Cr underlayer, improving the epitaxial growth of Co(10.0) planes. CrTi underlayer further more induced a significant reduction of grain size of magnetic layer.

서지기타정보

서지기타정보
청구기호 {MMS 03003
형태사항 [iv], 80 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Yong-Jin Kang
지도교수의 한글표기 : 박중근
지도교수의 영문표기 : Joong-Keun Park
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 74-77
주제 자성 박막
박막 응력
미세구조 형성
자성 특성
magnetic thin film
thin film stress
microstructure evolution
magnetic properties
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