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| National Institute of Advanced Industrial and Science Technology (AIST) |
Points
• Theoretical analysis was performed on a ferromagnetic nanocontact using a simulator developed by AIST.
• Control of oscillating frequency is possible within a range of 5–140 GHz by varying the applied direct current.
• Microwave and millimeter-wave transmitters for use in next-generation wireless communication technology and sensor technology are expected to be realized.
Summary
Hiroshi Imamura (Leader) and Hiroko Arai (AIST Postdoctoral Researcher), Theory Team, the Spintronics Research Center (Director: Shinji Yuasa) of the National Institute of Advanced Industrial Science and Technology (AIST; President: Tamotsu Nomakuchi), have demonstrated theoretically that oscillation of 5–140 GHz is possible by supplying direct current to a ferromagnetic nanocontact device.
Conventional giant magnetoresistive devices or ferromagnetic tunnel junction devices provide only low frequency oscillation and have been deemed unsuitable for applications requiring millimeter-wave (30–300 GHz) oscillation, including radar. However, upon analyzing precessional motion of spin induced by supplying a current to a ferromagnetic nanocontact device using a simulator developed by AIST, it was predicted that varying the current supplied to the ferromagnetic nanocontact device would cause the device to act as a current control-type oscillation device in the microwave to millimeter-wave range. If such a ferromagnetic nanocontact device is realized, it is expected to have applications in next-generation wireless communication technology and sensor technology.
Details of the results will be published online shortly in Applied Physics Letters, a US scientific journal.
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