Spin torque oscillation modes of a dual magnetic tunneling junction

Yisong Zhang; Hui Zhao; Andrew Lyle; Paul A. Crowell; Jian Ping Wang

doi:10.1063/1.3536538

Spin torque oscillation modes of a dual magnetic tunneling junction

Yisong Zhang, Hui Zhao, Andrew Lyle, Paul A. Crowell, Jian Ping Wang

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

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Abstract

Two coexisting spin torque oscillation (STO) modes in dual magnetic tunnel junctions with MgO barriers are observed by measuring the field-dependent power spectra. The frequency-field relation of the main STO mode is found to follow the Kittel equation at both positive and negative fields applied along the easy axis, which is consistent with spin torque oscillation of the magnetic free layer between the two MgO barriers. The second oscillation mode shows a different frequency-field relation for positive and negative applied fields, which is tentatively understood by considering the oscillation of the weakly-pinned top layer.

Original language	English (US)
Article number	07D307
Journal	Journal of Applied Physics
Volume	109
Issue number	7
DOIs	https://doi.org/10.1063/1.3536538
State	Published - Apr 1 2011

Bibliographical note

Funding Information:
This work was supported primarily by the MRSEC Program of the National Science Foundation under Award Number DMR-0819885. We acknowledge Dr. Jaesang Oh, Professor Anand Gopinath and Professor Rhonda Franklin for technical assistance with the microwave measurements and Professor Ilya Krivorotov from UC Irvine for useful discussions.

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abstract = "Two coexisting spin torque oscillation (STO) modes in dual magnetic tunnel junctions with MgO barriers are observed by measuring the field-dependent power spectra. The frequency-field relation of the main STO mode is found to follow the Kittel equation at both positive and negative fields applied along the easy axis, which is consistent with spin torque oscillation of the magnetic free layer between the two MgO barriers. The second oscillation mode shows a different frequency-field relation for positive and negative applied fields, which is tentatively understood by considering the oscillation of the weakly-pinned top layer.",

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AU - Zhang, Yisong

AU - Zhao, Hui

AU - Lyle, Andrew

AU - Crowell, Paul A.

AU - Wang, Jian Ping

N1 - Funding Information: This work was supported primarily by the MRSEC Program of the National Science Foundation under Award Number DMR-0819885. We acknowledge Dr. Jaesang Oh, Professor Anand Gopinath and Professor Rhonda Franklin for technical assistance with the microwave measurements and Professor Ilya Krivorotov from UC Irvine for useful discussions.

PY - 2011/4/1

Y1 - 2011/4/1

N2 - Two coexisting spin torque oscillation (STO) modes in dual magnetic tunnel junctions with MgO barriers are observed by measuring the field-dependent power spectra. The frequency-field relation of the main STO mode is found to follow the Kittel equation at both positive and negative fields applied along the easy axis, which is consistent with spin torque oscillation of the magnetic free layer between the two MgO barriers. The second oscillation mode shows a different frequency-field relation for positive and negative applied fields, which is tentatively understood by considering the oscillation of the weakly-pinned top layer.

AB - Two coexisting spin torque oscillation (STO) modes in dual magnetic tunnel junctions with MgO barriers are observed by measuring the field-dependent power spectra. The frequency-field relation of the main STO mode is found to follow the Kittel equation at both positive and negative fields applied along the easy axis, which is consistent with spin torque oscillation of the magnetic free layer between the two MgO barriers. The second oscillation mode shows a different frequency-field relation for positive and negative applied fields, which is tentatively understood by considering the oscillation of the weakly-pinned top layer.

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Spin torque oscillation modes of a dual magnetic tunneling junction

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