A statistical study of magnetic tunnel junctions for high-density spin torque transfer-MRAM (STT-MRAM)

Basically, in low power applications, the energy should be harvested depend on the frequent interruptions. In this paper we proposed the design of spin-transfer torque magnetic tunnel junctions (STT-MTJs) non volatile based on flip flops based memory. The main intent of non volatile is to address the state of system by saving the memory. By using STT-MTJs based flip flop, high energy consumption will be obtained and there will be backup of the system. In CMOS the flip flop will used standard magnetic MRAM technology. The main intent of magnetic tunnel junctions is to store the data. The proposed non volatile flip flop will determine the delay and energy. Logic circuits are enabled using non volatility and this will reduce the start up latency. This start up latency ranges from micro seconds to hundred pico seconds. Here the information is stored using non volatile logic of memory. This process is done on pre chip basis. Hence compared to existed system, the proposed system gives effective results.

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SPICE Macromodel of Spin-Torque-Transfer-Operated Magnetic Tunnel Junctions

IEEE Transactions on Electron Devices ◽

10.1109/ted.2010.2047073 ◽

2010 ◽

Vol 57 (6) ◽

pp. 1425-1430 ◽

Cited By ~ 68

Author(s):

Jonathan D. Harms ◽

Farbod Ebrahimi ◽

Xiaofeng Yao ◽

Jian-Ping Wang

Keyword(s):

Tunnel Junctions ◽

Magnetic Tunnel Junctions ◽

Spin Torque ◽

Spin Torque Transfer

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Electrical characterisation of higher order spin wave modes in vortex-based magnetic tunnel junctions

Communications Physics ◽

10.1038/s42005-021-00614-3 ◽

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.

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