Enhancement of microwave emission in magnetic tunnel junction oscillators through in-plane field orientation

Z. M. Zeng, P. Upadhyaya, P. Khalili Amiri, K. H. Cheung, J. A. Katine, J. Langer, K. L. Wang, H. W. Jiang

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

We observe giant enhancement of microwave emission in MgO-based magnetic tunnel junction nano-oscillators through in-plane magnetic field orientation. At an optimal in-plane field angle, the output power reaches up to 240 nW, two orders of magnitude higher compared to the vicinity of the easy axis (∼1 nW). Moreover, in this condition, the linewidth is significantly narrowed (<100 MHz) and the additional precession modes are suppressed. Analysis of the data indicates that the optimal field angle is influenced by the field-like torque. The results demonstrate that controlling the in-plane magnetic field orientation can be an important strategy for developing high-power spin-torque oscillators.

Original languageEnglish
Article number032503
JournalApplied Physics Letters
Volume99
Issue number3
DOIs
Publication statusPublished - 2011 Jul 18

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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