Agility of vortex-based nanocontact spin torque oscillators

Autor:	Manfrini, M., Devolder, T., Kim, Joo-Von, Crozat, P., Zerounian, N., Chappert, C., Van Roy, W., Lagae, L., Hrkac, G., Schrefl, T.
Rok vydání:	2009
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Materials Science Physics - Applied Physics
Druh dokumentu:	Working Paper
DOI:	10.1063/1.3263727
Popis:	We study the agility of current-tunable oscillators based on a magnetic vortex orbiting around a point contact in spin-valves. Theory predicts frequency-tuning by currents occurs at constant orbital radius, so an exceptional agility is anticipated. To test this, we have inserted an oscillator in a microwave interferometer to apply abrupt current variations while time resolving its emission. Using frequency shift keying, we show that the oscillator can switch between two stabilized frequencies differing by 25% in less than ten periods. With a wide frequency tunability and a good agility, such oscillators possess desirable figures of merit for modulation-based rf applications. Comment: 3 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0910.1941 Zobrazit plný text záznamu View this record from Arxiv