Power enhancement of angular polarizer spin torque oscillator in magnetic tunnel junction

Yisong Zhang, Hui Zhao, Andrew Lyle, Jian Ping Wang

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Abstract

The power angular dependence for spin torque oscillators (STOs) is systematically investigated in magnetic tunnel junctions by varying the in-plane polarizer angle (IPPA) which refers to the angle between the free and fixed layer. The polarizer angle is adjusted by integrating a lithography process and a post-annealing process. An increase of power with increasing IPPA is experimentally demonstrated. STOs with a 30 and 60 IPPA show a 2-3 and 5-6 times higher efficiency in the power spectral density of the main peak than that with the traditional 0 IPPA, respectively. This increase of the power efficiency with IPPA for STOs can be explained by the power dependence on the precession angle at different IPPA.

Original languageEnglish (US)
Article number07C714
JournalJournal of Applied Physics
Volume109
Issue number7
DOIs
StatePublished - Apr 1 2011

Bibliographical note

Funding Information:
This work was supported primarily by the MRSEC Program of the National Science Foundation under Award No. DMR-0819885. We thank Professor Paul Crowell, Mr. Te-Yu Chen, Dr. Jaesang Oh, Professor Anand Gopinath, and Professor Rhonda Franklin for their technical assistance with the microwave measurements and Professor Ilya Krivorotov from UC Irvine for his useful discussions.

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