Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Possibility of Magnetocapacitor for Multilayered Thin Films

  • Hong, Jong-Soo (Department of Nano and Electronic Physics, Kookmin University) ;
  • Yoon, Sung-Wook (Department of Nano and Electronic Physics, Kookmin University) ;
  • Kim, Chul-Sung (Department of Nano and Electronic Physics, Kookmin University) ;
  • Shim, In-Bo (Department of Nano and Electronic Physics, Kookmin University)
  • Received : 2012.01.16
  • Accepted : 2012.01.21
  • Published : 2012.06.30
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Abstract

CoNiFe(CNF)/$BaTiO_3(BTO)$/CoNiFe(CNF) multilayered thin films were deposited on Pt/Ti/$SiO_2$/Si substrates by using pulsed laser deposition (PLD) system. We fabricated three different thin films of BTO, BTO/CNF and CNF/BTO/CNF for magneto-capacitor and studied their crystalline structure, surface and interface morphology, and magnetic and electrical properties. When three different structures of multilayered thin film were compared, magnetization of CNF/BTO/CNF thin films was decreased by magnetic and dielectric interaction. Also we confirmed that capacitance of CNF/BTO/CNF multilayered thin film was enhanced as being near tetragonal structure with increasing of c/a ratio because of atomic bonding at interface between BTO dielectric and CNF magnetic materials. Finally, we studied the change of the capacitance of CNF/BTO/CNF multilayered thin film with magnetic field for emergence of magnetocapacitance and suggested a possibility of enhanced capacitance.

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