Sergey Erokhin, Dmitry Berkov
Non-linear magnetization dynamics in ferromagnetic nanoelements excited by the spin-polarized dc-current is one of the most intensively studied phenomena in solid state magnetism. Despite immense efforts, synchronization of oscillations induced in several such nanoelements (spin-torque driven nanooscillators, or STNO) still represents a major challenge both from the fundamental and technological point of view. Here we propose a system where synchronization of any number of STNOs in a wide current range can be easily achieved, and the inclusion of thermal fluctuations does not disturb it. Our STNOs are represented by vortices inside squared nanoelements, which precession is driven by current injected via point contacts. Using full-scale micromagnetic simulations we show that synchronization of these STNOs is extremely dynamically stable due to a very large coupling energy provided by the magnetodipolar and exchange interaction between nanoelements. Finally, using as an example a system of 10 oscillators, we demonstrate that our concept allows robust synchronization of arbitrary number of STNOs, even when corresponding nanocontacts have a broad size distribution.
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http://arxiv.org/abs/1302.0659
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