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

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.

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

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

Microwave magnetic-field effects in YBa2Cu3O7 single crystals near T c

1994 ◽  
Vol 16 (10-11) ◽  
pp. 1889-1894
Author(s):  
A. Agliolo Gallitto ◽  
I. Ciccarello ◽  
M. Guccione ◽  
M. Li Vigni ◽  
M. R. Trunin
Keyword(s):  
Magnetic Field ◽  
Single Crystals ◽  
Magnetic Field Effects ◽  
Field Effects ◽  
Microwave Magnetic Field

scholarly journals Strong linewidth variation for spin-torque nano-oscillators as a function of in-plane magnetic field angle

2008 ◽  
Vol 78 (2) ◽  
Author(s):  
K. V. Thadani ◽  
G. Finocchio ◽  
Z.-P. Li ◽  
O. Ozatay ◽  
J. C. Sankey ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Spin Torque
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