Nonlinear frequency and amplitude modulation of a nanocontact-based spin-torque oscillator

We study the current-controlled modulation of a nanocontact spin-torque oscillator. Three principally different cases of frequency nonlinearity (d(2)f/dI(dc)(2) being zero, positive, and negative) are investigated. Standard nonlinear frequency-modulation theory is able to accurately describe the fre...

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Veröffentlicht in:	Physical Review B 2010-04, Vol.81 (14), p.140408(R), Article 140408
Hauptverfasser:	Muduli, P. K., Pogoryelov, Ye, Bonetti, S., Consolo, G., Mancoff, Fred, Åkerman, Johan
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter physics driven frequency modulation Fysik Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik Kondenserade materiens fysik magnetic multilayers microwave generation NATURAL SCIENCES NATURVETENSKAP Physics Physics with spec. in Atomic, Molecular and Condensed Matter Physics polarized current spin-torque oscillator spintronics
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Zusammenfassung:	We study the current-controlled modulation of a nanocontact spin-torque oscillator. Three principally different cases of frequency nonlinearity (d(2)f/dI(dc)(2) being zero, positive, and negative) are investigated. Standard nonlinear frequency-modulation theory is able to accurately describe the frequency shifts during modulation. However, the power of the modulated sidebands only agrees with calculations based on a recent theory of combined nonlinear frequency and amplitude modulation.
ISSN:	1098-0121 1550-235X 1550-235X
DOI:	10.1103/PhysRevB.81.140408