Modulation of single and double spin torque oscillators

AIP Conf. Proc 01/2011; 1347:318-321. DOI:10.1063/1.3601845

ABSTRACT We discuss modulation of metallic spin torque oscillators (STOs) based on single and double nano-contacts. The modulation behavior of both types of devices is characterized by equally spaced multiple sidebands, which can be ascribed mostly to a frequency modulation phenomenon. However, quantitative examination reveals that amplitude modulation is also present in both types of devices. We also show the feasibility of modulating the synchronized state of a double nano-contact STO. The synchronized state can be treated as a single oscillator, which is a very promising feature for future applications of STO arrays.z

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    ABSTRACT: 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" , modulation signal to improve the STO linewidth. At the same time we use a low-frequency, "narrow" , 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.
    IEEE Transactions on Magnetics 10/2012; 48(11):4077-4080. · 1.42 Impact Factor
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    ABSTRACT: Spin-torque oscillators (STO) hold promise for multi-octave frequency operation at very high frequencies and modulation speeds. STO operation is typically demonstrated using large electromagnets and probe stations, and has so far not been packaged with a portable form factor. For STOs to be utilized in real applications, a smaller packaging solution is needed. We integrate STOs with packages originally developed for YIG oscillators, modified to incorporate permanent magnets and to achieve a compact portable oscillator based on the STO. Index Terms—Magnetic devices, magnetic packaging, spin torque oscillator (STO), spintronics.
    IEEE Transactions on Magnetics 10/2012; 48(11):4378-4381. · 1.42 Impact Factor


Available from
Nov 11, 2013

Yevgen Pogoryelov