Spin-Torque Oscillation Modes of a Composite Synthetic Antiferromagnetic Free Layer in Dual Magnetic Tunnel Junctions

Xiaohui Chao; Yisong Zhang; Jian Ping Wang

doi:10.1109/INTERMAG42984.2021.9579760

Spin-Torque Oscillation Modes of a Composite Synthetic Antiferromagnetic Free Layer in Dual Magnetic Tunnel Junctions

Xiaohui Chao, Yisong Zhang, Jian Ping Wang

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The spin-torque oscillation modes of a composite synthetic antiferromagnetic free layer in dual magnetic tunnel junctions with MgO barriers are studied experimentally by analyzing the field- and current-dependent power spectra. Two oscillation modes are observed under different magnetic fields and currents due to the unique layer structure. With increasing field, the first mode shows a frequency reduction at low magnetic fields followed by a frequency increase at high magnetic fields, while the second mode reveals a frequency increase at both low and high magnetic fields. The current-dependent power spectra of these two modes are also different. With increasing current, the frequency of the first mode drops at low magnetic fields and rises at high magnetic fields, while the other decreases at low and high magnetic fields. These two modes could be tentatively understood by considering the exchange coupling of the synthetic antiferromagnetic free layer.

Original language	English (US)
Title of host publication	2021 IEEE International Magnetic Conference, INTERMAG 2021 - Proceedings
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9780738130996
DOIs	https://doi.org/10.1109/INTERMAG42984.2021.9579760
State	Published - 2021
Event	2021 IEEE International Magnetic Conference, INTERMAG 2021 - Virtual, Online, France Duration: Apr 26 2021 → Apr 30 2021

Publication series

Name	Digests of the Intermag Conference
Volume	2021-April
ISSN (Print)	0074-6843

Conference

Conference	2021 IEEE International Magnetic Conference, INTERMAG 2021
Country/Territory	France
City	Virtual, Online
Period	4/26/21 → 4/30/21

Bibliographical note

Funding Information:
ACKNOWLEDGMENT This work was supported primarily by the MRSEC Program of the National Science Foundation under Award Number DMR-0819885. We acknowledge Dr. Mahdi Jamali for his

Publisher Copyright:
© 2021 IEEE.

Keywords

Dual magnetic tunnel junctions
Spin-torque oscillators
Synthetic antiferromagnetic free layer

Publisher link

10.1109/INTERMAG42984.2021.9579760

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Chao, X., Zhang, Y., & Wang, J. P. (2021). Spin-Torque Oscillation Modes of a Composite Synthetic Antiferromagnetic Free Layer in Dual Magnetic Tunnel Junctions. In 2021 IEEE International Magnetic Conference, INTERMAG 2021 - Proceedings (Digests of the Intermag Conference; Vol. 2021-April). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/INTERMAG42984.2021.9579760

Spin-Torque Oscillation Modes of a Composite Synthetic Antiferromagnetic Free Layer in Dual Magnetic Tunnel Junctions. / Chao, Xiaohui; Zhang, Yisong; Wang, Jian Ping.
2021 IEEE International Magnetic Conference, INTERMAG 2021 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2021. (Digests of the Intermag Conference; Vol. 2021-April).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Chao, X, Zhang, Y & Wang, JP 2021, Spin-Torque Oscillation Modes of a Composite Synthetic Antiferromagnetic Free Layer in Dual Magnetic Tunnel Junctions. in 2021 IEEE International Magnetic Conference, INTERMAG 2021 - Proceedings. Digests of the Intermag Conference, vol. 2021-April, Institute of Electrical and Electronics Engineers Inc., 2021 IEEE International Magnetic Conference, INTERMAG 2021, Virtual, Online, France, 4/26/21. https://doi.org/10.1109/INTERMAG42984.2021.9579760

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title = "Spin-Torque Oscillation Modes of a Composite Synthetic Antiferromagnetic Free Layer in Dual Magnetic Tunnel Junctions",

abstract = "The spin-torque oscillation modes of a composite synthetic antiferromagnetic free layer in dual magnetic tunnel junctions with MgO barriers are studied experimentally by analyzing the field- and current-dependent power spectra. Two oscillation modes are observed under different magnetic fields and currents due to the unique layer structure. With increasing field, the first mode shows a frequency reduction at low magnetic fields followed by a frequency increase at high magnetic fields, while the second mode reveals a frequency increase at both low and high magnetic fields. The current-dependent power spectra of these two modes are also different. With increasing current, the frequency of the first mode drops at low magnetic fields and rises at high magnetic fields, while the other decreases at low and high magnetic fields. These two modes could be tentatively understood by considering the exchange coupling of the synthetic antiferromagnetic free layer.",

keywords = "Dual magnetic tunnel junctions, Spin-torque oscillators, Synthetic antiferromagnetic free layer",

author = "Xiaohui Chao and Yisong Zhang and Wang, {Jian Ping}",

note = "Funding Information: ACKNOWLEDGMENT This work was supported primarily by the MRSEC Program of the National Science Foundation under Award Number DMR-0819885. We acknowledge Dr. Mahdi Jamali for his Publisher Copyright: {\textcopyright} 2021 IEEE.; 2021 IEEE International Magnetic Conference, INTERMAG 2021 ; Conference date: 26-04-2021 Through 30-04-2021",

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doi = "10.1109/INTERMAG42984.2021.9579760",

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AU - Chao, Xiaohui

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N1 - Funding Information: ACKNOWLEDGMENT This work was supported primarily by the MRSEC Program of the National Science Foundation under Award Number DMR-0819885. We acknowledge Dr. Mahdi Jamali for his Publisher Copyright: © 2021 IEEE.

PY - 2021

Y1 - 2021

N2 - The spin-torque oscillation modes of a composite synthetic antiferromagnetic free layer in dual magnetic tunnel junctions with MgO barriers are studied experimentally by analyzing the field- and current-dependent power spectra. Two oscillation modes are observed under different magnetic fields and currents due to the unique layer structure. With increasing field, the first mode shows a frequency reduction at low magnetic fields followed by a frequency increase at high magnetic fields, while the second mode reveals a frequency increase at both low and high magnetic fields. The current-dependent power spectra of these two modes are also different. With increasing current, the frequency of the first mode drops at low magnetic fields and rises at high magnetic fields, while the other decreases at low and high magnetic fields. These two modes could be tentatively understood by considering the exchange coupling of the synthetic antiferromagnetic free layer.

AB - The spin-torque oscillation modes of a composite synthetic antiferromagnetic free layer in dual magnetic tunnel junctions with MgO barriers are studied experimentally by analyzing the field- and current-dependent power spectra. Two oscillation modes are observed under different magnetic fields and currents due to the unique layer structure. With increasing field, the first mode shows a frequency reduction at low magnetic fields followed by a frequency increase at high magnetic fields, while the second mode reveals a frequency increase at both low and high magnetic fields. The current-dependent power spectra of these two modes are also different. With increasing current, the frequency of the first mode drops at low magnetic fields and rises at high magnetic fields, while the other decreases at low and high magnetic fields. These two modes could be tentatively understood by considering the exchange coupling of the synthetic antiferromagnetic free layer.

KW - Dual magnetic tunnel junctions

KW - Spin-torque oscillators

KW - Synthetic antiferromagnetic free layer

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Spin-Torque Oscillation Modes of a Composite Synthetic Antiferromagnetic Free Layer in Dual Magnetic Tunnel Junctions

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