摘要
Microwave permeability spectra of single Co nanotube under equilibrium state have been studied by micromagnetics simulation.More than four obvious resonance peaks have been found(11.72,24.20,33.18 and 39.55 GHz).Such large resonance frequency cannot be found in other traditional magnetic materials.The configurations of magnetic moments along the nanotube have been simulated.The results show that the top end of nanotube has a"flow-out"pattern of magnetic moments configuration.The bottom end has a"flow-in"pattern of magnetic moments configuration.The magnetic moments within the main body of nanotube are aligned perfectly along the length of nanotube.The magnitude of natural resonance peak is strongly related to the volume fraction of a zone,which has the same orientation of magnetic moments.Large microwave permeability values have been found for single nanotube.The generalized Snoek’s law has been used to validate the micromagnetics simulations in this paper.
Microwave permeability spectra of single Co nanotube under equilibrium state have been studied by micromagnetics simula- tion. More than four obvious resonance peaks have been found （11.72, 24.20, 33.18 and 39.55 GHz）. Such large resonance frequency cannot be found in other traditional magnetic materials. The configurations of magnetic moments along the nano- tube have been simulated. The results show that the top end of nanotube has a ＂flow-out＂ pattern of magnetic moments con- figuration. The bottom end has a ＂flow-in＂ pattern of magnetic moments configuration. The magnetic moments within the main body of nanotube are aligned perfectly along the length of nanotube. The magnitude of natural resonance peak is strongly related to the volume fraction of a zone, which has the same orientation of magnetic moments. Large microwave permeability values have been found for single nanotube. The generalized Snoek＇s law has been used to validate the micromagnetics simu- lations in this paper.
基金
supported by the National Natural Science Foundation of China(Grant No.61271039)
the Scientific Foundation of Young Scientists of Sichuan Province(Grant No.2012JQ0053)
the Program for New Century Excellent Talents in Universities(NCET-11-0060)
