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

doi:10.1063/1.3613965

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

^*Corresponding author for this work

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

40 Scopus citations

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 language	English (US)
Article number	032503
Journal	Applied Physics Letters
Volume	99
Issue number	3
DOIs	https://doi.org/10.1063/1.3613965
State	Published - Jul 18 2011

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.3613965

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@article{886c5ff9991f45a69b67125fdd568c06,

title = "Enhancement of microwave emission in magnetic tunnel junction oscillators through in-plane field orientation",

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.",

author = "Zeng, {Z. M.} and P. Upadhyaya and {Khalili Amiri}, P. and Cheung, {K. H.} and Katine, {J. A.} and J. Langer and Wang, {K. L.} and Jiang, {H. W.}",

note = "Funding Information: We would like to acknowledge our fruitful conversations with Professor A. Slavin, Professor I. N. Krivorotov, Dr. Y. Huai, and J. G. Alzate. This work was supported by the DARPA STT-RAM program and the Nanoelectronics Research Initiative (NRI) through the Western Institute of Nanoelectronics (WIN). ",

year = "2011",

month = jul,

day = "18",

doi = "10.1063/1.3613965",

language = "English (US)",

volume = "99",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

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TY - JOUR

T1 - Enhancement of microwave emission in magnetic tunnel junction oscillators through in-plane field orientation

AU - Zeng, Z. M.

AU - Upadhyaya, P.

AU - Khalili Amiri, P.

AU - Cheung, K. H.

AU - Katine, J. A.

AU - Langer, J.

AU - Wang, K. L.

AU - Jiang, H. W.

N1 - Funding Information: We would like to acknowledge our fruitful conversations with Professor A. Slavin, Professor I. N. Krivorotov, Dr. Y. Huai, and J. G. Alzate. This work was supported by the DARPA STT-RAM program and the Nanoelectronics Research Initiative (NRI) through the Western Institute of Nanoelectronics (WIN).

PY - 2011/7/18

Y1 - 2011/7/18

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=79960808856&partnerID=8YFLogxK

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U2 - 10.1063/1.3613965

DO - 10.1063/1.3613965

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VL - 99

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 3

M1 - 032503

ER -

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

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