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Combined wide-narrow double modulation of spin-torque oscillators for improved linewidth during communication
KTH, School of Information and Communication Technology (ICT), Material Physics, Material Physics, MF.
2012 (English)In: IEEE transactions on magnetics, ISSN 0018-9464, E-ISSN 1941-0069, Vol. 48, no 11, 4077-4080 p.Article in journal (Refereed) Published
Abstract [en]

Spin-torque oscillators (STOs) offer the advantage of high modulation rates. However the existence of regions with high-frequency nonlinearity, accompanied by increased signal linewidth, limits both the usable STO frequency range and the minimum frequency of modulation. On the other hand, use of a large modulation frequency increases the frequency modulation (FM) bandwidth. In order to overcome these problems, we propose to simultaneously modulate the STO with two signals having different frequencies. We use a high-frequency, wide (f W = 500 MHz), modulation signal to improve the STO linewidth. At the same time we use a low-frequency, narrow (f N = 40 MHz), modulation signal to show successful narrow bandwidth modulation of the improved STO signal. The proposed method of combined wide-narrow double modulation can significantly improve the usable operating frequency range of the STOs for communication applications.

Place, publisher, year, edition, pages
2012. Vol. 48, no 11, 4077-4080 p.
Keyword [en]
Frequency modulation, nanocontact, spin-torque oscillator (STO), spintronics
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-106929DOI: 10.1109/TMAG.2012.2200465ISI: 000310194400346ScopusID: 2-s2.0-84867823321OAI: diva2:574569

QC 20121206

Available from: 2012-12-06 Created: 2012-12-05 Last updated: 2012-12-06Bibliographically approved

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Åkerman, Johan
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