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- W2950986108 abstract "We consider triangular graphone structure – a semi-hydrogenated layer of graphene with hydrogen atoms boned to one of its sub-lattices only. The response function of graphone to an external magnetic field is evaluated in general using the Heisenberg Hamiltonian model of the structure with exchange energy coefficient J 0 of unknown value (negative due to ferromagnetic behaviour of triangular graphone). The spin wave approach in the limit of near zero temperature is used for the description of the magnetisation. A specific case when the graphone is exposed to a magnetic pulse with a given carrier frequency is examined in greater depth. To obtain the magnetization response, integration over both the frequency space and momentum space is necessary. Due to inapplicability of the isotropic approximation for the given geometry of graphone, integration over momentum space is performed numerically. The calculations show that the resonance of the system occurs at frequencies which correspond to the upper limit of the spin wave energy band and the saddle points of the energy surface. Using these results, further experimental investigation based on THz or far-infrared spectroscopy can be performed, which can determine the as-yet-unknown exchange energy coefficient J 0 . The coefficient can in turn provide an estimate of a temperature range for which the spin wave approach utilised in our investigation is valid." @default.
- W2950986108 created "2019-06-27" @default.
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- W2950986108 date "2018-01-01" @default.
- W2950986108 modified "2023-09-24" @default.
- W2950986108 title "Magnetic response of triangular graphone" @default.
- W2950986108 doi "https://doi.org/10.17072/1994-3598-2018-3-65-72" @default.
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