scholarly journals Detection of the Microwave Emission from a Spin-Torque Oscillator by a Spin Diode

2020 ◽  
Vol 13 (4) ◽  
Author(s):  
Danijela Marković ◽  
Nathan Leroux ◽  
Alice Mizrahi ◽  
Juan Trastoy ◽  
Vincent Cros ◽  
...  
Keyword(s):  
Microwave Emission ◽  
Spin Torque ◽  
Spin Diode

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.

Microwave emission power exceeding 10 μW in spin torque vortex oscillator

2016 ◽  
Vol 109 (25) ◽  
pp. 252402 ◽  
Author(s):  
Sumito Tsunegi ◽  
Kay Yakushiji ◽  
Akio Fukushima ◽  
Shinji Yuasa ◽  
Hitoshi Kubota
Keyword(s):  
Microwave Emission ◽  
Spin Torque ◽  
Emission Power

scholarly journals Extremely Coherent Microwave Emission from Spin Torque Oscillator Stabilized by Phase Locked Loop

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Shingo Tamaru ◽  
Hitoshi Kubota ◽  
Kay Yakushiji ◽  
Shinji Yuasa ◽  
Akio Fukushima
Keyword(s):  
Phase Locked Loop ◽  
Microwave Emission ◽  
Spin Torque

scholarly journals Non-volatile artificial synapse based on a vortex nano-oscillator

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Leandro Martins ◽  
Alex S. Jenkins ◽  
Lara San Emeterio Alvarez ◽  
Jérôme Borme ◽  
Tim Böhnert ◽  
...  
Keyword(s):  
Neural Networks ◽  
Artificial Neural Networks ◽  
Current Density ◽  
Output Voltage ◽  
Experimental Results ◽  
Spin Torque ◽  
Input Frequency ◽  
Micromagnetic Simulations ◽  
Artificial Synapse ◽  
Spin Diode

AbstractIn this work, a new mechanism to combine a non-volatile behaviour with the spin diode detection of a vortex-based spin torque nano-oscillator (STVO) is presented. Experimentally, it is observed that the spin diode response of the oscillator depends on the vortex chirality. Consequently, fixing the frequency of the incoming signal and switching the vortex chirality results in a different rectified voltage. In this way, the chirality can be deterministically controlled via the application of electrical signals injected locally in the device, resulting in a non-volatile control of the output voltage for a given input frequency. Micromagnetic simulations corroborate the experimental results and show the main contribution of the Oersted field created by the input RF current density in defining two distinct spin diode detections for different chiralities. By using two non-identical STVOs, we show how these devices can be used as programmable non-volatile synapses in artificial neural networks.

Large-amplitude, narrow-linewidth microwave emission in a dual free-layer MgO spin-torque oscillator

2014 ◽  
Vol 105 (18) ◽  
pp. 182406 ◽  
Author(s):  
Tazumi Nagasawa ◽  
Kiwamu Kudo ◽  
Hirofumi Suto ◽  
Koichi Mizushima ◽  
Rie Sato
Keyword(s):  
Large Amplitude ◽  
Microwave Emission ◽  
Spin Torque ◽  
Narrow Linewidth ◽  
Free Layer

The Microwave Emission Aspects by Rock Fracture Experiment

2016 ◽  
Vol 136 (5) ◽  
pp. 227-234
Author(s):  
Rikuya Hanawa ◽  
Kuniaki Shibata ◽  
Kenji Saegusa ◽  
Tadashi Takano
Keyword(s):  
Rock Fracture ◽  
Microwave Emission ◽  
Rock Fracture Experiment
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