Mathematical Optimization of Injection Locking Scheme for an Array of Spin Torque Nano Oscillators

2014 Fiscal Year Final Research Report

• Project/Area Number: 25820163
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Communication/Network engineering
• Research Institution: The University of Electro-Communications
• Principal Investigator: NAKADA Kazuki 電気通信大学, 情報理工学(系)研究科, 研究員 (40404107)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 磁性体発振素子 / 注入同期 / 位相縮約 / 無線通信 / スピントロニクス

Outline of Final Research Achievements

In this research, we have studied on the mathematical optimization of the injection locking scheme for an array of spin torque nano oscillators (STNOs) using the phase reduction approach with the purpose of increasing the output power of an ensemble of STNOs by enhancing their synchronization. First, we derived a phase equation from the LLGS equation that describes the macroscopic magnetization dynamics of a single STNO. Next, we estimated optimal waveforms for maximizing the locking range and the stability of the injection locking scheme based on the derived phase equation. Furthermore, we introduced discrete pulse current interactions among STNOs for improving the performance of the mutual synchronization scheme for the STNO array and optimized the effects of such interactions from the viewpoint of the phase reduction theory.

Free Research Field

磁性体／半導体集積デバイス，無線通信