The origin of interfacial electronic and magnetic degradation for a ferromagnet atop organic conjugated molecules

Yao Jane Hsu, Ya Jyuan Hung, Ying Chang Lin, Yu Ling Lai, Hsu Ting Chang, Chia Hao Wang, Yuet Loy Chan, Ching Lun Hsia, Meng Fan Luo, Chih Hao Lee, D. H. Wei

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Over the past years, spin and magnetic-field effects in devices operate by means of an organic spin valve using organic conjugated materials. As the interfacial properties in a ferromagnet-organic hybrid structure critically affect the performance of organic spintronic devices, understanding the interplay between interfaces in these hybrid structures becomes important. To study the interfacial electronic and magnetic properties of Co/Pentacene(Pc)/Co/ Cr/Si(1 0 0) in a vertical pseudo-spin-valve structure, we employed synchrotron photoelectron spectra (PES), near-edge X-ray absorption fine structure (NEXAFS) and the magneto-optical Kerr effect (MOKE) to examine the interfacial hybrid state for Pc on Co (Co/Pc) and vice versa for Pc/Co bilayers. The evidences from PES, NEXAFS and MOKE suggest an asymmetric electronic and magnetic interface for Co/Pc and Pc/Co. The Co/Pc interface presents a chemically stable surface, but Pc/Co displays a reacted interface with a magnetically dead layer on the surface. Assisted with a calculation based on the density-functional theory, we elucidate the possible origin of the electronic and magnetic degradation for Co atop Pc in the interfacial regime.

Original languageEnglish
Pages (from-to)575-580
Number of pages6
JournalSynthetic Metals
Volume161
Issue number7-8
DOIs
StatePublished - Apr 2011

Keywords

  • Density function theory
  • Interface
  • Magneto-optical Kerr effect
  • Near edge X-ray absorption fine structure
  • Organic spin valve
  • Photoelectron spectroscopy

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