Abstract
Iron precipitation and the accompanying magnetization and magnetoresistance (MR) were investigated in MgO(100) crystals implanted with Fe ions of 100 keV energy. Magnetization and MR properties were measured at room temperature. Conversion electron Mossbauer spectroscopy was used to identify physical states of the implanted irons. At doses less than 2 x 10 17 ions/cm 2 the measured magnetization exhibits non-hysteretic and unsaturated loops, i.e. superparamagnetic nature. The characteristics suggest the precipitation of implanted Fe ions as nano-granules in the MgO matrix. A significant GMR effect was observed at a dose of 2.0 × 10 17 ions/cm 2 and the obtained MR ratio was about 3.5% for fields of 12 kOe for the samples post-annealed at 300 °C in Ar. With increasing dose over 2.0 x 10 17 ions/cm 2 , a ferromagnetic component appears in the Fe implanted MgO samples.
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