Abstract
Abstract High-speed wireless communication plays a significant role in the Internet of Things (IoT) era. 120-GHz and 140-GHz band millimeter waves have potential in broadcasting wireless communications, wireless data transmissions between cellular base stations, and traffic monitoring sensors in intersection areas for advanced driver assistance systems (ADAS). Herein we report a magnetic millimeter wave absorber composed of TiIV–CoII substituted ε-Fe2O3, which is a series of ε-(TiIVCoII)xFeIII2−2xO3 nanomagnets (0 ≤ x ≤ 0.048). ε-(TiIVCoII)xFeIII2−2xO3 shows magnetic hysteresis loops, and the coercive field changes from 20.0 kOe (x = 0) to 8.4 kOe (x = 0.048) with increasing x. Terahertz time domain spectroscopy (THz-TDS) measurements show that ε-(TiIVCoII)xFeIII2−2xO3 exhibits millimeter wave absorption peaks at 140 GHz with full width at half maximum (Δf) = 15 GHz for x = 0.033 and at 121 GHz with Δf = 24 GHz for x = 0.048. These broadband absorptions are useful for noise suppression over a wide frequency range.
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