Linear phase tuning of spin torque oscillators using in-plane microwave fields

Tui Zeng; Yan Zhou; Johan Åkerman; P. T. Lai; Philip W.T. Pong

doi:10.1109/TMAG.2013.2276665

Linear phase tuning of spin torque oscillators using in-plane microwave fields

Tui Zeng, Yan Zhou, Johan Åkerman, P. T. Lai, Philip W.T. Pong

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

1 Scopus citations

Abstract

We demonstrate numerically and analytically that a nano-pillar spin torque oscillator (STO), operating either with in-plane or out-of-plane free-layer precession, locks to a microwave field (H_ac) having the same frequency as the STO. By varying the spatial direction of the microwave field, we further show the preferred phase shift (ΔΦ₀) between the STO and H_ac can be tuned in a linear fashion. We explain this phenomenon by using a magnetic-energy-based analysis. Our results provide a way to synchronize serially connected STOs by tuning the phase shift of each individual STO with external microwave field, which may enhance the locking efficiency, the locking range, and the output power of the serially connected STOs.

Original language	English (US)
Article number	2276665
Journal	IEEE Transactions on Magnetics
Volume	50
Issue number	1
DOIs	https://doi.org/10.1109/TMAG.2013.2276665
State	Published - Jan 2014
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Keywords

Locking frequency
Microwave field
Phase lock
Spin torque oscillator

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10.1109/TMAG.2013.2276665

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title = "Linear phase tuning of spin torque oscillators using in-plane microwave fields",

abstract = "We demonstrate numerically and analytically that a nano-pillar spin torque oscillator (STO), operating either with in-plane or out-of-plane free-layer precession, locks to a microwave field (Hac) having the same frequency as the STO. By varying the spatial direction of the microwave field, we further show the preferred phase shift (ΔΦ0) between the STO and Hac can be tuned in a linear fashion. We explain this phenomenon by using a magnetic-energy-based analysis. Our results provide a way to synchronize serially connected STOs by tuning the phase shift of each individual STO with external microwave field, which may enhance the locking efficiency, the locking range, and the output power of the serially connected STOs.",

keywords = "Locking frequency, Microwave field, Phase lock, Spin torque oscillator",

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T1 - Linear phase tuning of spin torque oscillators using in-plane microwave fields

AU - Zeng, Tui

AU - Zhou, Yan

AU - Åkerman, Johan

AU - Lai, P. T.

AU - Pong, Philip W.T.

PY - 2014/1

Y1 - 2014/1

N2 - We demonstrate numerically and analytically that a nano-pillar spin torque oscillator (STO), operating either with in-plane or out-of-plane free-layer precession, locks to a microwave field (Hac) having the same frequency as the STO. By varying the spatial direction of the microwave field, we further show the preferred phase shift (ΔΦ0) between the STO and Hac can be tuned in a linear fashion. We explain this phenomenon by using a magnetic-energy-based analysis. Our results provide a way to synchronize serially connected STOs by tuning the phase shift of each individual STO with external microwave field, which may enhance the locking efficiency, the locking range, and the output power of the serially connected STOs.

AB - We demonstrate numerically and analytically that a nano-pillar spin torque oscillator (STO), operating either with in-plane or out-of-plane free-layer precession, locks to a microwave field (Hac) having the same frequency as the STO. By varying the spatial direction of the microwave field, we further show the preferred phase shift (ΔΦ0) between the STO and Hac can be tuned in a linear fashion. We explain this phenomenon by using a magnetic-energy-based analysis. Our results provide a way to synchronize serially connected STOs by tuning the phase shift of each individual STO with external microwave field, which may enhance the locking efficiency, the locking range, and the output power of the serially connected STOs.

KW - Locking frequency

KW - Microwave field

KW - Phase lock

KW - Spin torque oscillator

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Linear phase tuning of spin torque oscillators using in-plane microwave fields

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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