Frequency enhancement and power tunability in tilted polarizer spin-torque nano oscillator

Designing Magnetic Droplet Soliton Nucleation Employing Spin Polarizer

We show by means of micromagnetic simulations that spin polarizer in nano-contact spin torque oscillators (NC-STOs) as the representative of the fixed layer in an orthogonal pseudo-spin valve (P-SV) can be employed to design and to control magnetic droplet soliton nucleation and dynamics. We found that using a tilted spin polarizer layer decreases the droplet nucleation time which is more suitable for high speed applications. However, a tilted spin polarizer increases the nucleation current and decreases the frequency stability of the droplet. Additionally, by driving the magnetization inhomog…

Strong Transport Anisotropy in a Ge/SiGe Quantum Well in Tilted Magnetic Fields

We report on a strong transport anisotropy in a 2D hole gas in a Ge/SiGe quantum well, which emerges only when both perpendicular and in-plane magnetic fields are present. The ratio of resistances, measured along and perpendicular to the in-plane field, can exceed $3\times 10^4$. The anisotropy occurs in a wide range of filling factors where it is determined {\em primarily} by the tilt angle. The lack of significant anisotropy without an in-plane field, easy tunability, and persistence to higher temperatures and filling factors set this anisotropy apart from nematic phases in GaAs/AlGaAs.

Long-wavelength emergent phonons in skyrmion crystals distorted by exchange anisotropy and tilted magnetic fields

Skyrmion crystals (SkX) are periodic alignment of magnetic skyrmions, i.e., a type of topologically protected spin textures. Compared with ordinary crystals, they can be drastically deformed under anisotropic effects because they are composed of field patterns whose deformation does not cause any bond-breaking. This exotic ductility of SkX bring about great tunability of its collective excitations called emergent phonons, which are vital for magnonics application. The question is how to quantitatively determine the emergent phonons of distorted SkX. Here we systematically study the long wavele…

三维倾斜方形人工自旋冰中的铁磁共振

Ferromagnetic resonance in 3D-tilted square artificial spin ices

本文针对三维人工自旋冰这一新前沿，通过半解析动力学方法和微磁模拟研究倾斜方形人工自旋冰的铁磁共振，揭示两种方法的优劣及共振特性随倾斜角可调的规律，助力理解3D ASI动力学。

动力学Floquet谱对倾斜单层1T$^\prime$MoS$_2$的等离激元激发及交换能的影响

Influence of Dynamical Floquet Spectrum on the Plasmon Excitations and Exchange Energy of tilted monolayer 1T$^\prime$MoS$_2$

该研究利用圆偏振光与Floquet能谱理论，探究了倾斜单层1T$^\prime$MoS$_2$的等离激元激发特性与交换能变化，揭示了温度、带隙等因素的调控规律及潜在应用。

Fabrication of voltage gated spin Hall nano-oscillators

We demonstrate an optimized fabrication process for electric field (voltage gate) controlled nano-constriction spin Hall nano-oscillators (SHNOs), achieving feature sizes of <30 nm with easy to handle ma-N 2401 e-beam lithography negative tone resist. For the nanoscopic voltage gates, we utilize a two-step tilted ion beam etching approach and through-hole encapsulation using 30 nm HfO_x. The optimized tilted etching process reduces sidewalls by 75% compared to no tilting. Moreover, the HfO_x encapsulation avoids any sidewall shunting and improves gate breakdown. Our experim…