Analysis method of a spin-torque oscillator using dc resistance change during injection locking to an external microwave magnetic field

2021 ◽  
Vol 119 (14) ◽  
pp. 142405
Author(s):  
Nagarjuna Asam ◽  
Hirofumi Suto ◽  
Shingo Tamaru ◽  
Hossein Sepehri-Amin ◽  
Anton Bolyachkin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Injection Locking ◽  
Spin Torque ◽  
Analysis Method ◽  
Resistance Change ◽  
Microwave Magnetic Field ◽  
Dc Resistance

Analysis of an all-in-plane spin-torque oscillator using injection locking to an external microwave magnetic field

2021 ◽  
Author(s):  
Hirofumi Suto ◽  
Hossein Sepehri-Amin ◽  
Nagarjuna Asam ◽  
Weinan Zhou ◽  
Anton Bolyachkin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Injection Locking ◽  
Spin Torque ◽  
Microwave Magnetic Field

Self-Injection Locking of a Spin Torque Nano-Oscillator to Magnetic Field Feedback

2018 ◽  
Vol 10 (2) ◽  
Author(s):  
Hanuman Singh ◽  
A. Bose ◽  
S. Bhuktare ◽  
A. Fukushima ◽  
K. Yakushiji ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Injection Locking ◽  
Spin Torque

scholarly journals Giant nonlinear damping in nanoscale ferromagnets

2019 ◽  
Vol 5 (10) ◽  
pp. eaav6943 ◽  
Author(s):  
I. Barsukov ◽  
H. K. Lee ◽  
A. A. Jara ◽  
Y.-J. Chen ◽  
A. M. Gonçalves ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Nanoparticles ◽  
High Resolution ◽  
Nonlinear Damping ◽  
Spin Torque ◽  
Magnetic Dynamics ◽  
Magnetic Damping ◽  
Microwave Magnetic Field ◽  
Geometric Confinement ◽  
Phenomenological Constant

Magnetic damping is a key metric for emerging technologies based on magnetic nanoparticles, such as spin torque memory and high-resolution biomagnetic imaging. Despite its importance, understanding of magnetic dissipation in nanoscale ferromagnets remains elusive, and the damping is often treated as a phenomenological constant. Here, we report the discovery of a giant frequency-dependent nonlinear damping that strongly alters the response of a nanoscale ferromagnet to spin torque and microwave magnetic field. This damping mechanism originates from three-magnon scattering that is strongly enhanced by geometric confinement of magnons in the nanomagnet. We show that the giant nonlinear damping can invert the effect of spin torque on a nanomagnet, leading to an unexpected current-induced enhancement of damping by an antidamping torque. Our work advances the understanding of magnetic dynamics in nanoscale ferromagnets and spin torque devices.

scholarly journals Microwave magnetic field modulation of spin torque oscillator based on perpendicular magnetic tunnel junctions

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Witold Skowroński ◽  
Jakub Chęciński ◽  
Sławomir Ziętek ◽  
Kay Yakushiji ◽  
Shinji Yuasa
Keyword(s):  
Magnetic Field ◽  
Microwave Field ◽  
Magnetic Tunnel Junction ◽  
Communication Technologies ◽  
Field Application ◽  
Spin Torque ◽  
Inductive Loop ◽  
High Data ◽  
Microwave Magnetic Field ◽  
Field Modulation

AbstractModulation of a microwave signal generated by the spin-torque oscillator (STO) based on a magnetic tunnel junction (MTJ) with perpendicularly magnetized free layer is investigated. Magnetic field inductive loop was created during MTJ fabrication process, which enables microwave field application during STO operation. The frequency modulation by the microwave magnetic field of up to 3 GHz is explored, showing a potential for application in high-data-rate communication technologies. Moreover, an inductive loop is used for self-synchronization of the STO signal, which after field-locking, exhibits significant improvement of the linewidth and oscillation power.

Switching field reduction of a perpendicular magnetic nanodot in a microwave magnetic field emitted from a spin-torque oscillator

2017 ◽  
Vol 110 (13) ◽  
pp. 132403 ◽  
Author(s):  
Hirofumi Suto ◽  
Taro Kanao ◽  
Tazumi Nagasawa ◽  
Kiwamu Kudo ◽  
Koichi Mizushima ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Spin Torque ◽  
Switching Field ◽  
Microwave Magnetic Field

Fault Isolation of High Resistance Defects Using Comparative Magnetic Field Imaging

2003 ◽  
Author(s):  
Antonio Orozco ◽  
Elena Talanova ◽  
Anders Gilbertson ◽  
L.A. Knauss ◽  
Zhiyong Wang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Resistance ◽  
Integrated Circuit ◽  
Time Domain Reflectometry ◽  
Fault Isolation ◽  
Main Stream ◽  
Layer By Layer ◽  
Impedance Change ◽  
Resistance Change ◽  
Require Time

Abstract As integrated circuit packages become more complicated, the localization of defects becomes correspondingly more difficult. One particularly difficult class of defects to localize is high resistance (HR) defects. These defects include cracked traces, delaminated vias, C4 non-wet defects, PTH cracks, and any other package or interconnect structure that results in a signal line resistance change that exceeds the specification of the device. These defects can result in devices that do not run at full speed, are not reliable in the field, or simply do not work at all. The main approach for localizing these defects today is time domain reflectometry (TDR) [1]. TDR sends a short electrical pulse into the device and monitors the time to receive reflections. These reflections can correspond to shorts, opens, bends in a wire, normal interfaces between devices, or high resistance defects. Ultimately anything that produces an electrical impedance change will produce a TDR response. These signals are compared to a good part and require time consuming layer-by-layer deprocessing and comparison to a standard part. When complete, the localization is typically at best to within 200 microns. A new approach to isolating high resistance defects has been recently developed using current imaging. In recent years, current imaging through magnetic field detection has become a main-stream approach for short localization in the package [2] and is also heavily utilized for die level applications [3]. This core technology has been applied to the localization of high resistance defects. This paper will describe the approach, and give examples of test samples as well as results from actual yield failures.

Microwave magnetic field effects on high-power microwave window breakdown

2000 ◽  
Vol 28 (3) ◽  
pp. 472-477 ◽  
Author(s):  
M. Kristiansen ◽  
L.L. Hatfield ◽  
H. Krompholz ◽  
J. Dickens ◽  
A.A. Neuber ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Power ◽  
Magnetic Field Effects ◽  
High Power Microwave ◽  
Field Effects ◽  
Microwave Magnetic Field ◽  
Power Microwave

scholarly journals Tunable microwave magnetic field detection based on Rabi resonance with a single cesium-rubidium hybrid vapor cell

2018 ◽  
Vol 113 (16) ◽  
pp. 164101 ◽  
Author(s):  
Fuyu Sun ◽  
Zhiyuan Jiang ◽  
Jifeng Qu ◽  
Zhenfei Song ◽  
Jie Ma ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Vapor Cell ◽  
Field Detection ◽  
Microwave Magnetic Field ◽  
Tunable Microwave
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