We observed that nanowires of Fe grown in the lumens of multi-walled carbon nanotubes required four times higher magnetic field strength to reach saturation compared to planar nanometric thin films of Fe on MgO(100). Nanowires of Fe and nanometric thin films of Fe both exhibited two fold magnetic symmetries. Structural and magnetic properties of 1-dimensional nanowires and 2-dimensional nanometric films were studied by several magnetometery techniques. The θ-2θ x-ray diffraction measurements showed that a (200) peak of Fe appeared on thin film samples deposited at higher substrate temperatures. In these samples prepared at higher temperatures, lower coercive field and highly pronounced two-fold magnetic symmetry were observed. Our results show that maximum magnetocrystalline anisotropy occurred for sample deposited at 100 °C and it decreased at higher deposition temperatures.
A transceiver pixel for active imaging incorporating a transmitter (TX) and a coherent receiver (RX) is demonstrated in 65 nm CMOS at 260 GHz. The pixel occupies an area of 450 × 580µm 2 and is the first demonstration of pixels incorporating a TX and a coherent RX which are smaller than λ/2 × λ/2. The pixel exhibits −21.3 dBm total radiated power and −79.5 dBm sensitivity at a 1 kHz noise bandwidth. This sensitivity is about 10 dB better than the state-of-the-art pixel with only a coherent RX. The pixel consumes 18.7 mW of DC power.
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