A study of the magnetic interlayer coupling between CoO(NiO) and Fe films across MgO spacer layer in CoO(NiO)/MgO/Fe/Ag(001) using MOKE and XMLD

ORAL

Abstract

CoO(NiO)/MgO/Fe/Ag(001) films were grown epitaxially and studied by Magneto Optical Kerr Effect (MOKE) and X-ray Magnetic Linear Dichroism (XMLD). The enhancement of the Fe layer coercivity due to its coupling to the AFM (NiO) overlayer was studied as a function of the MgO spacer layer thickness using MOKE. We found that the Fe coercivity enhancement persists to $\sim$2 ML MgO thickness, after which the AFM-FM interlayer coupling becomes too weak to affect the Fe ceorcivity. Below 2ML MgO thickness, the Fe coercivity enhancement depends both on the MgO and NiO thicknesses. To further understand the effect of interlayer coupling, the rotatable CoO spins in CoO/MgO/Fe/Ag(001) after field cooling along the Fe(100) axis were determined using the XMLD measurement as a function of the MgO thickness. We found that 2 ML MgO thickness sets a critical value beyond which the CoO/MgO/Fe interlayer coupling no longer rotates the CoO spins.

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Authors

  • Ali Sucipt Tan

    University of California Berkeley, Department of Physics, University of California at Berkeley

  • Jia Li

    University of California Berkeley, Department of Physics, University of California at Berkeley

  • Yang Meng

    Department of Physics, University of California at Berkeley, University of California Berkeley

  • Elke Arenholz

    Brookhaven National Laboratory, Advanced Light Source, Lawrence Berkeley National Laboratory

  • Chan Yong Hwang

    Advanced Industrial Technology Group, Korea Research Institute of Standards and Sciences, Korea Research Institute of Standards and Science

  • Zi Q. Qiu

    Department of Physics, University of California at Berkeley, University of California Berkeley, University of California at Berkeley