scholarly journals Synchronization of spin-torque-driven nano-oscillators for point contacts on a quasi-one-dimensional nanowire: Micromagnetic simulations

2013 ◽  
Vol 87 (1) ◽  
Author(s):  
D. V. Berkov
Keyword(s):  
Spin Torque ◽  
Point Contacts ◽  
Micromagnetic Simulations ◽  
One Dimensional

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.

Modeling of the perpendicular polarizer-planar free layer spin torque oscillator: Micromagnetic simulations

2008 ◽  
Vol 78 (2) ◽  
Author(s):  
I. Firastrau ◽  
D. Gusakova ◽  
D. Houssameddine ◽  
U. Ebels ◽  
M.-C. Cyrille ◽  
...  
Keyword(s):  
Spin Torque ◽  
Free Layer ◽  
Micromagnetic Simulations

Application of Improved H-Matrices in Micromagnetic Simulations of Spin Torque Oscillator

2018 ◽  
Vol 54 (3) ◽  
pp. 1-4 ◽  
Author(s):  
Akihiro Ida ◽  
Tadashi Ataka ◽  
Yasuhito Takahashi ◽  
Takeshi Mifune ◽  
Takeshi Iwashita ◽  
...  
Keyword(s):  
Spin Torque ◽  
Micromagnetic Simulations

scholarly journals On the critical current for the charge density wave transport

2002 ◽  
Vol 12 (9) ◽  
pp. 127-128
Author(s):  
A. A. Sinchenko ◽  
S. G. Zybtsev ◽  
I. G. Gorlova ◽  
Yu. I. Latyshev ◽  
V. Ya. Pokrovskii ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Metallic State ◽  
High Current ◽  
Point Contacts ◽  
One Dimensional ◽  
Wave Transport ◽  
Current Densities ◽  
Very High

We report transport measurements under very high current densities j, up to 108 A/cm2, of quasi-one-dimensional charge-density wave (CDW) conductors NbSe3 and TaS3. Above $j_0-10^1$ A/cm2 the point contacts NbSe3-NbSe3 show a sharp singularity, and the TaS3 nanosamples show metallic temperature dependence (positive dR/dn. We interpret both results as an evidence for the suppression of the Peierls gap 2A and development of the metallic state above j0. Possible scenarios of the Peierls state destruction are discussed.

TRANSPORT PROPERTIES OF TUNNEL-COUPLED ONE-DIMENSIONAL CHANNELS FROM AN ELECTRON BILAYER SYSTEM IN PERPENDICULAR MAGNETIC FIELD

2009 ◽  
Vol 23 (12n13) ◽  
pp. 2910-2914 ◽  
Author(s):  
S. S. BUCHHOLZ ◽  
S. F. FISCHER ◽  
U. KUNZE ◽  
D. SCHUH ◽  
G. ABSTREITER
Keyword(s):  
Magnetic Field ◽  
Transport Properties ◽  
Quantum Hall ◽  
Quantum Point Contacts ◽  
Perpendicular Magnetic Field ◽  
Point Contacts ◽  
One Dimensional ◽  
Bilayer System ◽  
Quantum Point ◽  
Landau Level Mixing

In a tunnel coupled GaAs / AlGaAs electron bilayer system (BLS), we compare transport measurements of 1D quantum Hall (QH) edge channels with lithographically defined quantum point contacts (QPCs). The electron densities in both systems can be varied by a top-gate. In a perpendicular magnetic field, Landau level mixing is observed in the QH regime, and indications of crossings of spin split QPC subbands are detected.

Micromagnetic Simulations of Emission Power in Spin Torque Oscillator: Influence of Diameter and Interlayer Exchange Coupling

2018 ◽  
Vol 54 (11) ◽  
pp. 1-5
Author(s):  
Tomohiro Tanaka ◽  
Atsushi Furuya ◽  
Yuji Uehara ◽  
Koichi Shimizu ◽  
Jun Fujisaki ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Spin Torque ◽  
Interlayer Exchange Coupling ◽  
Emission Power ◽  
Micromagnetic Simulations ◽  
Interlayer Exchange

Spin-torque driven excitations and hysteresis in magnetic point contacts

2006 ◽  
Vol 99 (8) ◽  
pp. 08G503 ◽  
Author(s):  
A. Konovalenko ◽  
V. Korenivski ◽  
I. K. Yanson ◽  
Yu. G. Naidyuk
Keyword(s):  
Spin Torque ◽  
Point Contacts
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