Faster, farther, stronger: spin transfer torque driven high order propagating spin waves in nano-contact magnetic tunnel junctions
arXiv:1712.00954 · doi:10.1038/s41467-018-06589-0
Abstract
Short wave-length exchange-dominated propagating spin waves will enable magnonic devices to operate at higher frequencies and higher data transmission rates.1 While GMR based magnetic nano-contacts are highly efficient injectors of propagating spin waves2,3, the generated wave lengths are 2.6 times the nano-contact diameter4, and the electrical signal strength remains much too weak for practical applications. Here we demonstrate nano-contact based spin wave generation in magnetic tunnel junction stacks, and observe large discrete frequency steps consistent with the hitherto ignored possibility of second and third order propagating spin waves with wave lengths of 120 and 74 nm, i.e. much smaller than the 150 nm nano-contact. These higher-order propagating spin waves will not only enable magnonic devices to operate at much higher frequencies, but also greatly increase their transmission rates and spin wave propagating lengths, both proportional to the much higher group velocity.
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- Spin-orbit-torque magnonics
- Experimental demonstration of a rapid sweep-tuned spectrum analyzer with temporal resolution based on a spin-torque nano-oscillator
- Spin-orbit torque based physical unclonable function
- Spin-Hall nanooscillator based on an antiferromagnetic domain wall
- Spin wave-driven variable-phase mutual synchronization in spin Hall nano-oscillators
- Femtosecond laser pulse driven caustic spin wave beams
- Magnetodynamics in orthogonal nanocontact spin-torque nano-oscillators based on magnetic tunnel junctions
- Local non-linear excitation of sub-100 nm bulk-type spin waves by edge-localized spin waves in magnetic films
- Sustained coherent spin wave emission using frequency combs
- Field-free high-frequency exchange-spring spin-torque nano-oscillators
- Impact of intra-grain spin wave reflections on nano-contact spin torque oscillators
- Femtosecond laser comb driven perpendicular standing spin waves
- Spin wave excitations in a nanowire spin-torque oscillator with perpendicular magnetic anisotropy
- Mutual synchronization in spin torque and spin Hall nano-oscillators
- Nonlinear spin dynamics of ferromagnetic ring in the vortex state and its application for spin-transfer nano-oscillator