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Using nanosphere lithography (NSL) technique, we have fabricated well defined triangular shaped Fe64Ni36 dot arrays with feature size down to 30 nm on silicon substrate. In-plane focused magneto-optical Kerr effect (MOKE) measurements show that these nanoscale dot arrays have an enhanced coercivity of around 200 Oe compared with that of the continuous thin film of 50 Oe. In combining with micromagnetic...
In this paper, we have fabricated and studied the bias dependence of magnetic tunnel junctions based on a CoFeB / MgO / CoFeB tri-layer structure. These structures exhibit TMR ratios as high as 236% at room temperature. Furthermore, we have observes a weakened dependence of TMR on bias voltage in these structures, with the MR ratio decaying to one half of the zero-bias value at an applied voltage...
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