Castro M A, Mancilla-Almonacid D, Dieny B, Allende S, Buda-Prejbeanu L D, Ebels U
Universidad de Santiago de Chile (USACH), Departamento de Física, CEDENNA, Avda. V. Jara 3493, Estación Central, Santiago, Chile.
Univ. Grenoble Alpes, CEA, CNRS, Grenoble INP, SPINTEC, 38000, Grenoble, France.
Sci Rep. 2022 Jul 14;12(1):12030. doi: 10.1038/s41598-022-15483-1.
An array of spin torque nano-oscillators (STNOs), coupled by dipolar interaction and arranged on a ring, has been studied numerically and analytically. The phase patterns and locking ranges are extracted as a function of the number N, their separation, and the current density mismatch between selected subgroups of STNOs. If [Formula: see text] for identical current densities through all STNOs, two degenerated modes are identified an in-phase mode (all STNOs have the same phase) and a splay mode (the phase makes a 2[Formula: see text] turn along the ring). When inducing a current density mismatch between two subgroups, additional phase shifts occur. The locking range (maximum current density mismatch) of the in-phase mode is larger than the one for the splay mode and depends on the number N of STNOs on the ring as well as on the separation. These results can be used for the development of magnetic devices that are based on STNO arrays.
通过数值和解析方法研究了一系列通过偶极相互作用耦合并排列在环上的自旋扭矩纳米振荡器（STNO）。提取了相位模式和锁定范围，作为STNO数量N、它们之间的间距以及选定STNO子组之间电流密度失配的函数。如果所有STNO的电流密度相同，即[公式：见原文]，则可识别出两种简并模式：同相模式（所有STNO具有相同相位）和展开模式（相位沿环旋转2[公式：见原文]）。当在两个子组之间引入电流密度失配时，会出现额外的相移。同相模式的锁定范围（最大电流密度失配）大于展开模式的锁定范围，并且取决于环上STNO的数量N以及间距。这些结果可用于基于STNO阵列的磁性器件的开发。
