Abstract
The magneto-optical properties of graphite nanoplatelet films in the THz frequency range have been investigated. The room-temperature THz spectrum of graphite nanoplatelets shows a free carrier absorption at zero frequency with an electronic scattering rate of 175cm−1 (3.3×1013rad/s) and plasma frequency of 1675cm−1. The lack of a major change in Drude plasma frequency down to 4.2K implies that any band gaps in graphite nanoplatelets are less than 1meV. The 300K magneto-transmission contrast is as large as 60% near 1THz at 10T. The results are potentially useful for magnetic memory applications away from the dc limit.
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