Spin-torque oscillator with tilted fixed layer magnetization

2008 ◽  
Vol 92 (26) ◽  
pp. 262508 ◽  
Author(s):  
Yan Zhou ◽  
C. L. Zha ◽  
S. Bonetti ◽  
J. Persson ◽  
Johan Åkerman
Keyword(s):  
Spin Torque ◽  
Fixed Layer ◽  
Layer Magnetization

scholarly journals Performance Optimization of Spin-Torque Microwave Detectors with Material and Operational Parameters

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
X. Li ◽  
Y. Zhou ◽  
Philip W. T. Pong
Keyword(s):  
Magnetic Field ◽  
Tilt Angle ◽  
Performance Optimization ◽  
Effective Field ◽  
Performance Tuning ◽  
Spin Torque ◽  
Operational Parameters ◽  
Equilibrium Angle ◽  
Reference Layer ◽  
Layer Magnetization

Sensitivity, bandwidth, and noise equivalent power (NEP) are important indicators of the performance of microwave detectors. The previous reports on spin-torque microwave detectors (STMDs) have proposed various approaches to increase the sensitivity. However, the effects of these methods on the other two indicators remain unclear. In this work, macrospin simulation is developed to evaluate how the performance can be optimized through changing the material (tilt angle of reference-layer magnetization) and operational parameters (the direction of magnetic field and working temperature). The study on the effect of magnetic field reveals that the driving force behind the performance tuning is the effective field and the equilibrium angle between the magnetization of the free layer and that of the reference layer. The material that offers the optimal tilt angle in reference-layer magnetization is determined. The sensitivity can be further increased by changing the direction of the applied magnetic field and the operation temperature. Although the optimized sensitivity is accompanied by a reduction in bandwidth or an increase in NEP, a balance among these performance indicators can be reached through optimal tuning of the corresponding influencing parameters.

Spin Torque Nano Oscillators as Potential Terahertz (THz) Communications Devices

2009 ◽  
Author(s):  
Alma E. Wickenden ◽  
Chris Fazi ◽  
Ben Huebschman ◽  
Roger Kaul ◽  
Andrew C. Perrella ◽  
...  
Keyword(s):  
Spin Torque ◽  
Thz Communications

scholarly journals Electrical characterisation of higher order spin wave modes in vortex-based magnetic tunnel junctions

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Alex. S. Jenkins ◽  
Lara San Emeterio Alvarez ◽  
Samh Memshawy ◽  
Paolo Bortolotti ◽  
Vincent Cros ◽  
...  
Keyword(s):  
Spin Wave ◽  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Higher Order ◽  
Spin Torque ◽  
Micromagnetic Simulations ◽  
Higher Order Modes ◽  
Spin Diode ◽  
Super High Frequency ◽  
Wave Modes

AbstractNiFe-based vortex spin-torque nano-oscillators (STNO) have been shown to be rich dynamic systems which can operate as efficient frequency generators and detectors, but with a limitation in frequency determined by the gyrotropic frequency, typically sub-GHz. In this report, we present a detailed analysis of the nature of the higher order spin wave modes which exist in the Super High Frequency range (3–30 GHz). This is achieved via micromagnetic simulations and electrical characterisation in magnetic tunnel junctions, both directly via the spin-diode effect and indirectly via the measurement of the coupling with the gyrotropic critical current. The excitation mechanism and spatial profile of the modes are shown to have a complex dependence on the vortex core position. Additionally, the inter-mode coupling between the fundamental gyrotropic mode and the higher order modes is shown to reduce or enhance the effective damping depending upon the sense of propagation of the confined spin wave.

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