scholarly journals Zero-Field Spin Torque Oscillator Based on Magnetic Tunnel Junctions with a Tilted CoFeB Free Layer

2012 ◽  
Vol 5 (6) ◽  
pp. 063005 ◽  
Author(s):  
Witold Skowroński ◽  
Tomasz Stobiecki ◽  
Jerzy Wrona ◽  
Günter Reiss ◽  
Sebastiaan van Dijken
Keyword(s):  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Spin Torque ◽  
Zero Field ◽  
Free Layer

Reducing spin-torque switching current by incorporating an ultra-thin Ta layer with CoFeB free layer in magnetic tunnel junctions

2014 ◽  
Vol 105 (24) ◽  
pp. 242411 ◽  
Author(s):  
R. S. Liu ◽  
H. Meng ◽  
V. B. Naik ◽  
C. H. Sim ◽  
S. Yap ◽  
...  
Keyword(s):  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Spin Torque ◽  
Free Layer ◽  
Switching Current

scholarly journals Spin-torque induced rf oscillation in magnetic tunnel junctions with an Fe-rich CoFeB free layer

2011 ◽  
Vol 266 ◽  
pp. 012098 ◽  
Author(s):  
Y Masugata ◽  
S Ishibashi ◽  
H Tomita ◽  
T Seki ◽  
T Nozaki ◽  
...  
Keyword(s):  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Spin Torque ◽  
Free Layer

High Spin Torque Efficiency of Magnetic Tunnel Junctions with MgO/CoFeB/MgO Free Layer

2012 ◽  
Vol 5 (9) ◽  
pp. 093008 ◽  
Author(s):  
Guenole Jan ◽  
Yu-Jen Wang ◽  
Takahiro Moriyama ◽  
Yuan-Jen Lee ◽  
Mark Lin ◽  
...  
Keyword(s):  
High Spin ◽  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Spin Torque ◽  
Free Layer

scholarly journals Observation of magnetic droplets in magnetic tunnel junctions

2021 ◽  
Vol 65 (2) ◽  
Author(s):  
Kewen Shi ◽  
Wenlong Cai ◽  
Sheng Jiang ◽  
Daoqian Zhu ◽  
Kaihua Cao ◽  
...  
Keyword(s):  
Materials Science ◽  
Tunnel Junctions ◽  
Layer Structure ◽  
Magnetic Tunnel Junctions ◽  
Spin Torque ◽  
Free Layer ◽  
Resonance Modes ◽  
Power Enhancement ◽  
Highly Nonlinear ◽  
Pinning Field

AbstractMagnetic droplets, a class of highly nonlinear magnetodynamic solitons, can be nucleated and stabilized in nanocontact spin-torque nano-oscillators. Here we experimentally demonstrate magnetic droplets in magnetic tunnel junctions (MTJs). The droplet nucleation is accompanied by power enhancement compared with its ferromagnetic resonance modes. The nucleation and stabilization of droplets are ascribed to the double-CoFeB free-layer structure in the all-perpendicular MTJ, which provides a low Zhang-Li torque and a high pinning field. Our results enable better electrical sensitivity in fundamental studies of droplets and show that the droplets can be utilized in MTJ-based applications and materials science.

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 Double-Free-Layer Magnetic Tunnel Junctions for Probabilistic Bits

2021 ◽  
Vol 15 (4) ◽  
Author(s):  
Kerem Y. Camsari ◽  
Mustafa Mert Torunbalci ◽  
William A. Borders ◽  
Hideo Ohno ◽  
Shunsuke Fukami
Keyword(s):  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Free Layer

Characterization of magnetic tunnel junctions (MTJ) with magnetostrictive free layer materials

2004 ◽  
Vol 272-276 ◽  
pp. 2023-2024 ◽  
Author(s):  
M. Löhndorf ◽  
S. Dokupil ◽  
J. Wecker ◽  
M. Rührig ◽  
E. Quandt
Keyword(s):  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Free Layer
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