scholarly journals Micromagnetic Study of Synchronization of Nonlinear Spin-Torque Oscillators to Microwave Current and Field

2012 ◽  
Vol 2012 ◽  
pp. 1-5
Author(s):  
M. Carpentieri ◽  
G. Finocchio ◽  
A. Giordano ◽  
B. Azzerboni ◽  
F. Lattarulo
Keyword(s):  
Phase Shift ◽  
Phase Locking ◽  
Bias Current ◽  
Spin Torque ◽  
Spin Torque Oscillators

The nonautonomous dynamics of spin-torque oscillators in presence of both microwave current and field has been numerically studied in nanostructured devices. When both microwave current and field are applied at the same frequency, integer phase locking at different locking ratio is found. In the locking region, a study of the intrinsic phase shift between the locking force (current or field) and the giant magnetoresistive signal as a function of the bias current is also exploited.

Dependence of Nonlinearity and Spectral Linewidth on Bias Current in Large-Angle Spin-Torque Oscillators

2015 ◽  
Vol 4 (1) ◽  
Author(s):  
P. M. Braganca ◽  
B. A. Gurney ◽  
A. G. F. Garcia ◽  
J. A. Katine ◽  
J. R. Childress
Keyword(s):  
Large Angle ◽  
Bias Current ◽  
Spin Torque ◽  
Spectral Linewidth ◽  
Spin Torque Oscillators

Intrinsic Phase Shift and Novel Dynamic Magnetization States of a Spin Torque Oscillator under ac Current Injection

2007 ◽  
Vol 998 ◽  
Author(s):  
Yan Zhou ◽  
Johan Persson ◽  
Johan Akerman
Keyword(s):  
Phase Shift ◽  
Phase Locking ◽  
Wave Length ◽  
Anisotropy Field ◽  
Spin Torque ◽  
Demagnetizing Field ◽  
Oscillation Modes ◽  
Out Of Plane ◽  
Ac Current ◽  
Dc Current

ABSTRACTWe report on a preferred phase shift ΔΦ0 between a spin torque oscillator (STO) and an ac current (Iac) injected at the intrinsic frequency (fSTO) of the STO. In the in-plane precession mode (IP) the STO adjusts to a state where its resistance (or voltage) lags Iac about a quarter of a wave length (ΔΦ0 = 87°−94°). In the IP mode ΔΦ0 increases somewhat with the dc current. As the precession changes into the Out-Of-Plane (OOP) mode, ΔΦ0 jumps by about 180°, i.e. the STO resistance now precedes Iac by about a quarter of a wave length (|ΔΦ0| = 86°). At the IP/OOP boundary, the ac current mixes the two oscillation modes and both periodic and chaotic oscillations are observed. As a consequence of mixing, subharmonic terms appear in the STO signal. ΔΦ0 can furthermore be tuned by changing one or more of the anisotropy field, the demagnetizing field or the applied field. At the IP/OOP boundary, Iac mixes the two oscillation modes. The intrinsic ΔΦ0 will impact any circuit design based on STO technology and will e.g. have direct consequences for phase locking in networks of serially connected STOs.

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 A Dual Rising Edge Shift Algorithm for Eliminating the Transient DC-Bias Current in Transformer for a Dual Active Bridge Converter

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4264
Author(s):  
Michal Gierczynski ◽  
Lech M. Grzesiak ◽  
Arkadiusz Kaszewski
Keyword(s):  
Phase Shift ◽  
Power Flow ◽  
Bias Current ◽  
Compensation Algorithm ◽  
Dual Active Bridge ◽  
Simple Implementation ◽  
Dc Bias ◽  
Fast Settling ◽  
Parameter Values ◽  
Laboratory Prototype

This paper deals with a well-known problem of the transient DC-bias current occurring during a phase shift transition in dual active bridge (DAB) DC/DC converters. This phenomenon, if not compensated, can cause damage to the converter or deteriorate its performance. One aim of this paper is to present a solution which allows for the elimination of the undesired transient DC-bias component in current waveforms. This solution is the dual rising edge shift (DRES) compensation algorithm. It provides a very simple implementation and fast settling time within the first half of a switching period. Moreover, the solution is independent on any measurements or system parameter values. It is based on the double-sided single phase shift (DSSPS) modulation, which is described in detail along with a converter model in steady-state. Then, the mechanisms leading to the transient DC-bias are explained, and the compensation algorithm is derived. The performance of the algorithm has been tested using a laboratory prototype. A comprehensive set of tests, involving rapid step changes in power flow and frequency sweep, are provided. Finally, the features of the proposed algorithm are briefly discussed.

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

scholarly journals Mutual phase locking of very nonidentical spin torque nanooscillators via spin wave interaction

2014 ◽  
Vol 67 (2) ◽  
pp. 20601 ◽  
Author(s):  
Ansar R. Safin ◽  
Nicolay N. Udalov ◽  
Mikhail V. Kapranov
Keyword(s):  
Spin Wave ◽  
Phase Locking ◽  
Wave Interaction ◽  
Spin Torque

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

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
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