Abstract：
:Spin torque oscillator (STO) has been attracting a great deal of attention as a candidate for the next generation microwave signal sources for various modern electronics systems since its advent. However, the phase noise of STOs under free running oscillation is still too large to be used in practical microwave applications, thus an industrially viable means to stabilize its oscillation has been strongly sought. Here we demonstrate implementation of a phase locked loop using a STO as a voltage controlled oscillator (VCO) that generates a 7.344 GHz microwave signal stabilized by a 153 MHz reference signal. Spectrum measurement showed successful phase locking of the microwave signal to the reference signal, characterized by an extremely narrow oscillation peak with a linewidth of less than the measurement limit of 1 Hz. This demonstration should be a major breakthrough toward various practical applications of STOs.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Tamaru S,Kubota H,Yakushiji K,Yuasa S,Fukushima Adoi
10.1038/srep18134subject
Has Abstractpub_date
2015-12-11 00:00:00pages
18134issn
2045-2322pii
srep18134journal_volume
5pub_type
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