Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, People's Republic of China.
Key Laboratory for Special Function Materials and Structural Design of the Ministry of the Education, Lanzhou University, Lanzhou 730000, People's Republic of China.
J Phys Condens Matter. 2023 Feb 16;35(14). doi: 10.1088/1361-648X/acb8f2.
The spin torque nano-oscillator (STNO), a nanosize microwave signal generator, have caught the attention of a number of researchers due to its obvious advantages. Recently a chiral bulk material with twisted skyrmion has been discovered in studies with different helicity degrees. In this work, we design a new STNO based on twisted skyrmion existing in free layers of magnetic tunnel junction structure. We first investigate the effect of the magnetic moment of fixed layer on the twisted skyrmion and frequency of STNO. Although the magnetic moment of fixed layer does not affect the state of the twisted skyrmion but affects the precession frequency of STNO. Later, the current, external magnetic field and Dzyaloshinskii-Moriya interaction strength are changed to regulate the oscillation frequency of STNO. Our result may be favorable for the design of new twisted skyrmion-based STNO.
自旋扭矩纳米振荡器（STNO）作为一种纳米级微波信号发生器，由于其明显的优势引起了许多研究人员的关注。最近，在具有不同螺旋度的研究中发现了一种具有扭曲斯格明子的手性体材料。在这项工作中，我们设计了一种基于磁性隧道结结构自由层中存在的扭曲斯格明子的新型 STNO。我们首先研究了固定层的磁矩对扭曲斯格明子和 STNO 频率的影响。虽然固定层的磁矩不影响扭曲斯格明子的状态，但会影响 STNO 的进动频率。后来，通过改变电流、外磁场和 Dzyaloshinskii-Moriya 相互作用强度来调节 STNO 的振荡频率。我们的结果可能有利于新的基于扭曲斯格明子的 STNO 的设计。
