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2015 | 128 | 2B | B-19-B-22
Article title

Development of Giant Magnetoresistance Material Based on Cobalt Ferrite

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This paper describes an experimental study on development of giant magnetoresistance material based on cobalt ferrite (CoFe₂O₄). We have successfully developed a new giant magnetoresistance material based on CoFe₂O₄ i.e; sandwich (CoFe₂O₄/CuO/CoFe₂O₄), spin valve (FeMn/CoFe₂O₄/CuO/CoFe₂O₄), and organic giant magnetoresistance (CoFe₂O₄/Alq₃/CoFe₂O₄) using dc-opposed target magnetron sputtering method. Crystalline structure and morphology of thin films were characterized by X-ray diffraction and scanning electron microscope. The electrical properties were characterized using a four-point probe and magnetic properties were characterized using a vibrating sample magnetometer. In sandwich structure, the giant magnetoresistance ratio maximum are found at room temperature in CoFe₂O₄/CuO/CoFe₂O₄ thin film is 70% when CoFe₂O₄ and CuO layer thickness are 62.5 nm and 14.4 nm, respectively. The maximum of giant magnetoresistance ratio of the spin valve structure obtained is 32.5% at FeMn layer thickness of 45 nm. Meanwhile, in organic giant magnetoresistance the maximum value of the giant magnetoresistance ratio are approximately 35.5% at room temperature.
Physical description
  • Institut Teknologi Bandung, Department of Physics, Jl. Ganesa 10, Bandung, Indonesia
  • Institut Teknologi Sumatera, Department of Physics, Jl. Terusan Ryacudu, Lampung Selatan, Indonesia
  • Universitas Negeri Padang, Department of Physics, Jl. Prof. Hamka, Padang, Indonesia
  • Institut Teknologi Bandung, Department of Physics, Jl. Ganesa 10, Bandung, Indonesia
  • Institut Teknologi Bandung, Department of Physics, Jl. Ganesa 10, Bandung, Indonesia
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