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Magnetic Properties of Enhanced Permeability Dielectrics for Nanomagnetic Logic Circuits

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7 Author(s)
Peng Li$^{1}$ Department of Electrical Engineering,, University of Notre Dame,, Notre Dame,, IN, USA ; Vijay K. Sankar ; Gyorgy Csaba ; X. Sharon Hu
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Enhanced permeability dielectric (EPD) samples were fabricated in an ultra-high-vacuum magnetron sputtering system, and their magnetic properties were studied by a variable-temperature vibrating sample magnetometer. EPDs were fabricated with layers of CoFe forming uniform particles separated by MgO dielectric as insulator. The optimal sample has peak relative low-field permeability (μr) of 452, saturation magnetization (Ms) of 636 emu/cm3 and magnetization at 100 Oe (M100 Oe) of 398 emu/cm3. Effect of low temperature is discussed, and measurements show that the EPD remains superparamagnetic at 173 K; μr, Ms and M100 Oe values at reduced temperatures are higher than those at room temperature. The sample is ferromagnetic at 100 K.

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IEEE Transactions on Magnetics  (Volume:48 ,  Issue: 11 )