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

scholarly journals Limits for the vortex state spin torque oscillator in magnetic nanopillars: Micromagnetic simulations for a thin free layer

2010 ◽  
Vol 108 (12) ◽  
pp. 123914 ◽  
Author(s):  
Gloria R. Aranda ◽  
Julian M. Gonzalez ◽  
Juan J. del Val ◽  
Konstantin Y. Guslienko
Keyword(s):  
Vortex State ◽  
Spin Torque ◽  
Free Layer ◽  
Micromagnetic Simulations ◽  
Magnetic Nanopillars ◽  
State Spin

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.

scholarly journals Magnetization Dynamics in a Perpendicular Anisotropy Free Layer under a Spin Torque Effect with Crossed Polarization

2020 ◽  
Vol 25 (1) ◽  
pp. 54
Author(s):  
Nafeesa Rahman ◽  
Rachid Sbiaa
Keyword(s):  
Tunnel Junction ◽  
Magnetic Tunnel Junction ◽  
Film Plane ◽  
Spin Torque ◽  
Spin Angular Momentum ◽  
Perpendicular Anisotropy ◽  
Free Layer ◽  
Magnetization Dynamics ◽  
Magnetization Direction ◽  
Spin Polarized

The transfer of spin angular momentum from a spin polarized current provides an efficient way of reversing the magnetization direction of the free layer of the magnetic tunnel junction (MTJ), and while faster reversal will reduce the switching energy, this in turn will lead to low power consumption. In this work, we propose a design where a spin torque oscillator (STO) is integrated with a conventional magnetic tunnel junction (MTJ) which will assist in the ultrafast reversal of the magnetization of the free layer of the MTJ. The structure formed (MTJ stacked with STO), will have the free layer of the MTJ sandwiched between two spin polarizer layers, one with a fixed magnetization direction perpendicular to film plane (main static polarizer) and the other with an oscillatory magnetization (dynamic polarizer). The static polarizer is the fixed layer of the MTJ itself and the dynamic polarizer is the free layer of the STO.

Observations of thermally excited ferromagnetic resonance on spin torque oscillators having a perpendicularly magnetized free layer

2014 ◽  
Vol 115 (17) ◽  
pp. 17C740 ◽  
Author(s):  
S. Tamaru ◽  
H. Kubota ◽  
K. Yakushiji ◽  
M. Konoto ◽  
T. Nozaki ◽  
...  
Keyword(s):  
Ferromagnetic Resonance ◽  
Spin Torque ◽  
Free Layer ◽  
Spin Torque Oscillators

Enhanced power of spin torque oscillators with Permalloy free layer

2017 ◽  
Author(s):  
C. Murapaka ◽  
E. Jimenez ◽  
K. Merazzo-Jaimes ◽  
A. Ruiz-Calaforra ◽  
R. Ferreira ◽  
...  
Keyword(s):  
Spin Torque ◽  
Free Layer ◽  
Spin Torque Oscillators

scholarly journals Spin-torque-induced switching in a perpendicular GMR nanopillar with a soft core inside the free layer

2009 ◽  
Vol 11 (2) ◽  
pp. 023027 ◽  
Author(s):  
Xuan Li ◽  
Zongzhi Zhang ◽  
Q Y Jin ◽  
Yaowen Liu
Keyword(s):  
Soft Core ◽  
Spin Torque ◽  
Free Layer

Spin-torque nano-oscillator based on a synthetic antiferromagnet free layer and perpendicular to plane polarizer

2013 ◽  
Vol 113 (11) ◽  
pp. 113908 ◽  
Author(s):  
I. Firastrau ◽  
L. D. Buda-Prejbeanu ◽  
B. Dieny ◽  
U. Ebels
Keyword(s):  
Spin Torque ◽  
Free Layer ◽  
Synthetic Antiferromagnet

scholarly journals Critical Field of Spin Torque Oscillator with Perpendicularly Magnetized Free Layer

2013 ◽  
Vol 6 (12) ◽  
pp. 123003 ◽  
Author(s):  
Tomohiro Taniguchi ◽  
Hiroko Arai ◽  
Sumito Tsunegi ◽  
Shingo Tamaru ◽  
Hitoshi Kubota ◽  
...  
Keyword(s):  
Critical Field ◽  
Spin Torque ◽  
Free Layer
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