Phase-locked spin torque oscillators: Impact of device variability and time delay

2007 ◽  
Vol 101 (9) ◽  
pp. 09A503 ◽  
Author(s):  
J. Persson ◽  
Yan Zhou ◽  
Johan Akerman
Keyword(s):  
Time Delay ◽  
Spin Torque ◽  
Spin Torque Oscillators

Impact of Device Variability and Circuit Phase Shift in Synchronized Spin Torque Oscillators

2007 ◽  
Vol 998 ◽  
Author(s):  
Johan Persson ◽  
Yan Zhou ◽  
Johan Akerman
Keyword(s):  
Phase Diagram ◽  
Time Delay ◽  
Process Variations ◽  
Small Time ◽  
Spin Transfer Torque ◽  
Spin Torque ◽  
Plane Anisotropy ◽  
Out Of Plane ◽  
The Impact ◽  
Spin Torque Oscillators

ABSTRACTCurrent-induced magnetization dynamics in a system composed of two electrically coupled spin torque oscillators (STOs) is examined. The dynamics of the STOs is modeled by the Landau–Lifshitz–Gilbert equations modified with a Slonczewski spin-transfer torque term. To study the impact of realistic process variations on STO synchronization we let the two STOs have different in-plane anisotropy fields (Hk). The simulation also provides for a time delay τ. We construct a phase diagram of the STO synchronization as a function of Hk and direct current (Idc) at different τ. The phase diagram turns out to be quite rich with different types of synchronized precession modes. While the synchronized state is originally very sensitive to STO process variations and can only sustain up to 4% Hk variation, the addition of a small time delay dramatically improves its robustness and allows as much as 145% Hk variation in the entire out-of-plane precession regime. It is also shown that the two STOs can not only be locked in frequency, but also in phase at a given τ and the phase difference between the two STOs can be tuned by varying the dc current.

scholarly journals Impact of intragrain spin wave reflections on nanocontact spin torque oscillators

2021 ◽  
Vol 103 (21) ◽  
Author(s):  
Anders J. Eklund ◽  
Mykola Dvornik ◽  
Fatjon Qejvanaj ◽  
Sheng Jiang ◽  
Sunjae Chung ◽  
...  
Keyword(s):  
Spin Wave ◽  
Spin Torque ◽  
Wave Reflections ◽  
Spin Torque Oscillators

scholarly journals Spin-wave-beam driven synchronization of nanocontact spin-torque oscillators

2015 ◽  
Vol 11 (3) ◽  
pp. 280-286 ◽  
Author(s):  
A. Houshang ◽  
E. Iacocca ◽  
P. Dürrenfeld ◽  
S. R. Sani ◽  
J. Åkerman ◽  
...  
Keyword(s):  
Spin Wave ◽  
Wave Beam ◽  
Spin Torque ◽  
Spin Torque Oscillators

Hysteretic spin-wave excitation in spin-torque oscillators as a function of the in-plane field angle: A micromagnetic description

2011 ◽  
Vol 110 (12) ◽  
pp. 123913 ◽  
Author(s):  
G. Finocchio ◽  
A. Prattella ◽  
G. Consolo ◽  
E. Martinez ◽  
A. Giordano ◽  
...  
Keyword(s):  
Spin Wave ◽  
Spin Torque ◽  
Wave Excitation ◽  
Plane Field ◽  
Spin Wave Excitation ◽  
Spin Torque Oscillators

Stability of Spin Torque Oscillators for MAMR: Perspectives of Materials and Design

2020 ◽  
Vol 56 (1) ◽  
pp. 1-5
Author(s):  
Changqiu Yu ◽  
Yongming Luo ◽  
Hai Li ◽  
Jiahong Wen ◽  
Zhenghong Qian ◽  
...  
Keyword(s):  
Spin Torque ◽  
Spin Torque Oscillators

scholarly journals Agility of vortex-based nanocontact spin torque oscillators

2009 ◽  
Vol 95 (19) ◽  
pp. 192507 ◽  
Author(s):  
M. Manfrini ◽  
T. Devolder ◽  
Joo-Von Kim ◽  
P. Crozat ◽  
N. Zerounian ◽  
...  
Keyword(s):  
Spin Torque ◽  
Spin Torque Oscillators

Amplitude Noise in Spin-Torque Oscillators

2011 ◽  
Vol 4 (6) ◽  
pp. 063005 ◽  
Author(s):  
Tazumi Nagasawa ◽  
Koichi Mizushima ◽  
Hirofumi Suto ◽  
Kiwamu Kudo ◽  
Rie Sato
Keyword(s):  
Spin Torque ◽  
Amplitude Noise ◽  
Spin Torque Oscillators
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