• Title/Summary/Keyword: Co-Pd films

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Soft X-ray Synchrotron-Radiation Spectroscopy Study of [Co/Pd] Multilayers as a Function of the Pd Sublayer Thickness (Pd층의 두께 변화에 따른 [Co/Pd] 다층박막의 연엑스선 방사광 분광 연구)

  • Kim, D.H.;Lee, Eunsook;Kim, Hyun Woo;Seong, Seungho;Kang, J.-S.;Yang, Seung-Mo;Park, Hae-Soo;Hong, JinPyo
    • Journal of the Korean Magnetics Society
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    • v.26 no.4
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    • pp.124-128
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    • 2016

  • We have investigated the electronic structures of intermetallic multilayer (ML) films of [$Co(2{\AA})/Pd(x{\AA})$] (x: the thickness of the Pd sublayer; x = $1{\AA}$, $3{\AA}$, $5{\AA}$, $7{\AA}$, $9{\AA}$) by employing soft X-ray absorption spectroscopy (XAS) and soft X-ray magnetic circular dichroism (XMCD). Both Co 2p XAS and XMCD spectra are found to be similar to one another, as well as to those of Co metal, providing evidence for the metallic bonding of Co ions in [Co/Pd] ML films. By analyzing the measured Co 2p XMCD spectra, we have determined the orbital magnetic moments and the spin magnetic moments of Co ions in [$Co(2{\AA})/Pd(x{\AA})$] ML films. Based on this analysis, we have found that the orbital magnetic moments are enhanced greatly when x increases from $1{\AA}$ to $3{\AA}$, and then do not change much for $x{\geq}3{\AA}$. This finding suggests that the interface spin-orbit coupling plays an important role in determining the perpendicular magnetic anisotropy in [Co/Pd] ML films.

  • https://doi.org/10.4283/JKMS.2016.26.4.124 인용 PDF KSCI

Thermal Stability and the Effect of Substrate Temperature on the Structural and Magnetic Properties of Pd/Co Multilayer Films (Pd/Co 다층박막의 구조 및 자기적 특성에 미치는 기판온도 및 열적안정성에 관한 연구)

  • 허용철;김상록;이성래;김창수
    • Journal of the Korean Magnetics Society
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    • v.3 no.4
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    • pp.298-304
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    • 1993

  • The effects of the substrate temperature and the Pd underlayer on the structure and the magnetic properties of Pd/Co multilayer films prepared by the thermal evaporation were studied. As the substrate temperature increases up to $150^{\circ}C$, the crystallinity of sublayers, (111) texture and the interface sharpness of Pd/Co multilayers were improved due to the enhanced mobility of adatoms. As results of that, the perpendicular and surface anisotropy energies were increased but the coercivity was decreased because the pinning sites of domain wall decreased due to the grain growth. The grain size of the multilayers increased with Pd underlyer thickness. Thermal degradation was enhanced at above $200^{\circ}C$ due to interdiffusion at the Pd/Co interface. The intensity of the main diffraction peak rapidly decayed in the initial stage of aging and then decreased slowly. The rapid change of the intensity in the initial stage was speculated to be due to the structural relaxation phenomena and the later stage change was due to the interdiffusion. The activation energy for the interdiffusion in Pd4/Co1 multilayers was 14.9 KCal/mole.K.

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