Reproducible trajectory on subnanosecond spin-torque magnetization switching under a zero-bias field for MgO-based ferromagnetic tunnel junctions

2010 ◽  
Vol 96 (14) ◽  
pp. 142502 ◽  
Author(s):  
Tatsuya Aoki ◽  
Yasuo Ando ◽  
Mikihiko Oogane ◽  
Hiroshi Naganuma
Keyword(s):  
Tunnel Junctions ◽  
Bias Field ◽  
Spin Torque ◽  
Magnetization Switching ◽  
Zero Bias

Micromagnetic Modeling of Nanocontact Spin-Torque Oscillators With Perpendicular Anisotropy at Zero Bias Field

2008 ◽  
Vol 44 (11) ◽  
pp. 2512-2515 ◽  
Author(s):  
V. Puliafito ◽  
B. Azzerboni ◽  
G. Consolo ◽  
G. Finocchio ◽  
L. Torres ◽  
...  
Keyword(s):  
Bias Field ◽  
Spin Torque ◽  
Perpendicular Anisotropy ◽  
Zero Bias ◽  
Micromagnetic Modeling ◽  
Spin Torque Oscillators

scholarly journals Spin–orbit torque driven magnetization switching in W/CoFeB/MgO-based type-Y three terminal magnetic tunnel junctions

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shinji Isogami ◽  
Yohei Shiokawa ◽  
Atsushi Tsumita ◽  
Eiji Komura ◽  
Yugo Ishitani ◽  
...  
Keyword(s):  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Bias Field ◽  
Film Plane ◽  
Spin Orbit ◽  
Magnetization Switching ◽  
Effective Spin ◽  
Current Dependence ◽  
Magnetic Easy Axis ◽  
Long Pulse

AbstractWe have studied current induced magnetization switching in W/CoFeB/MgO based three terminal magnetic tunnel junctions. The switching driven by spin—orbit torque (SOT) is evaluated in the so-called type-Y structure, in which the magnetic easy-axis of the CoFeB layer lies in the film plane and is orthogonal to the current flow. The effective spin Hall angle estimated from the bias field dependence of critical current (Ic) is ~ 0.07. The field and current dependence of the switching probability are studied. The field and DC current induced switching can be described using a model based on thermally assisted magnetization switching. In contrast, the 50 ns long pulse current dependence of the switching probability shows significant deviation from the model, even if contribution from the field-like torque is included. The deviation is particularly evident when the threshold switching current is larger. These results show that conventional thermally assisted magnetization switching model cannot be used to describe SOT induced switching using short current pulses.

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.

Quantum theory of spin-torque driven magnetization switching

2021 ◽  
Vol 103 (9) ◽  
Author(s):  
Ping Tang ◽  
Xiufeng Han ◽  
Shufeng Zhang
Keyword(s):  
Quantum Theory ◽  
Spin Torque ◽  
Magnetization Switching

Spin-transfer-induced magnetization switching in tunnel junctions with nanocurrent channels

2007 ◽  
Vol 90 (11) ◽  
pp. 112504 ◽  
Author(s):  
Yisong Zhang ◽  
Zongzhi Zhang ◽  
Yaowen Liu ◽  
B. Ma ◽  
Q. Y. Jin
Keyword(s):  
Tunnel Junctions ◽  
Spin Transfer ◽  
Magnetization Switching
Sign in / Sign up

Export Citation Format

Share Document