Spin transfer torque driven higher-order propagating spin waves in nano-contact magnetic tunnel junctions.

ABSTRACT: Short wavelength exchange-dominated propagating spin waves will enable magnonic devices to operate at higher frequencies and higher data transmission rates. While giant magnetoresistance (GMR)-based magnetic nanocontacts are efficient injectors of propagating spin waves, the generated wavelengths are 2.6 times the nano-contact diameter, and the electrical signal strength remains too weak for applications. Here we demonstrate nano-contact-based spin wave generation in magnetic tunnel junctions and observe large-frequency steps consistent with the hitherto ignored possibility of second- and third-order propagating spin waves with wavelengths of 120 and 74 nm, i.e., much smaller than the 150-nm nanocontact. Mutual synchronization is also observed on all three propagating modes. These higher-o

SUBMITTER: Houshang A 

PROVIDER: S-EPMC6197248 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature