• 제목/요약/키워드: Pd/Co multilayer

검색결과 60건 처리시간 0.026초

Preparation and properties of Bi-based lead-free ceramic multilayer actuators

  • Nguyen, Van-Quyet;Han, Hyoung-Su;Lee, Han-Bok;Yoon, Jong Il;Ahn, Kyoung Kwan;Lee, Jae-Shin
    • Journal of Ceramic Processing Research
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    • 제13권spc2호
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    • pp.282-285
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    • 2012
  • Lead-free (Bi0.5Na0.41K0.09)TiO3 (BNKT) multilayer ceramic actuators were prepared using tape-casting and screen-printing techniques. Co-firing behavior of BNKT/AgPd laminates was examined as a function of sintering temperature. It was found that co-firing induced bending and electrical properties were very sensitive to sintering condition. By optimizing sintering conditions, lead-free electrostrictive multilayer actuators with normalized strain Smax/Emax of 266 pm/V have been successfully fabricated, which is promising for lead-free actuator applications.

광전자분광법을 이용한 Co/Pd 다층박막의 전자구조연구 (Valence Band Photoemission Study of Co/Pd Multilayer)

  • 강정수;강상국;정재인;홍재화;이영백;신현준
    • 한국자기학회지
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    • 제3권1호
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    • pp.48-55
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    • 1993
  • 광전자분광법 (Photoelectron Spectroscopy : PES)을 이용하여, 차세대 광자기 기록매체로 유망한 Co/Pd 다층박막의 전자구조를 연구하였다. Co/Pd 다층박막의 Co 3d 전자 PES 스펙트럼에서는 페르미 에너지 ($E_{F}$) 근처에 폭이 좁은 피이크가 관찰되었고, 아울러 $E_{F}$로부터 약 2.5 eV 아래에 폭이 넓은 피이크도 관찰되었다. 그 중 $E_{F}$ 근처에 위치한 피이크의 폭은 bulk Co 3d 전자 PES 스펙트럼에서의 피이크폭에 비하여 훨씬 좁았는데, 이러한 차이는 Co 자기모멘트가 Co/Pd 다층박막에서 buik Co 에 비하여 증진되는 현상과 일치한다. 한편 $E_{F}$ 아래 2.5 eV에 의치한 피이크는 Pd의 valence band 구조와 유사함이 발견되었는데, 이는 Co 단층과 Pd 단층간에 상당한 상호작용 (hybridization)이 있음을 나타낸다고 볼 수 있다. Co/Pd 다층박막에 대하여 실험적으로 결정한 Co 3d 전자 Pes 스펙트럼을 국재스핀밀도함수이론을 이용하여 얻은 이론적 전자구조 계산결과와 비교하였다. 이상의 비교에 의하면 밴드이론계산에 의한 Co 3d 밴드폭은 실험과 잘 일치하였으나, PES 스펙트럼에서 관찰되어진 $E_{F}$ 근처의 폭이 좁은 피이크는 밴드이론이 잘 기술하지 못함이 발견되었다.

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THE EFFECT OF SUBSTRATE TEMPERATURE ON GRAIN STRUCTURES AND MAGNETIC PROPERTIES OF Pd(Pt/Co/Pt) MODULATED MULTILAYERS

  • Xiao, Ying;Xu, Jun-Hao;Wittborn, Jesper;Yu, Seong-Cho;Rao, K.V.
    • 한국자기학회지
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    • 제5권5호
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    • pp.716-719
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    • 1995
  • Pd/(Pt/Co/Pt) modulated multilayer films have been deposited on various substrates with Pd/Pt buffer layers. Films grown at different temperatures have very distinct magnetic properties and surface microstructures. Atomic force(AFM) and scanning tunneling (STM) microscopies studies of these films reveal that films deposited at room temperature have small grain structures with an average grain size of about $140\;{\AA}$. However, much larger grains of about $1200\;{\AA}$ in size are observed in the films grown on buffer layers which were deposited at $500^{\circ}C$. These large grains are found to actually consist of smaller grains of about $170{\AA}$ in diameter. SQUID magnetic and Kerr hysteresis loop measurements indicate that multilayer films with large grains exhibit high magnetic coercivities of around 5 kOe. A subgrain growth model is proposed to understand the observed grain structures in the multilayers.

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