Simulating Resonant Magnetization Reversals in Nanomagnets

Jinho Lim; Zhaohui Zhang; Anupam Garg; John Ketterson

doi:10.1109/TMAG.2020.3039468

Simulating Resonant Magnetization Reversals in Nanomagnets

Jinho Lim^*, Zhaohui Zhang, Anupam Garg, John Ketterson

^*Corresponding author for this work

Physics and Astronomy

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

2 Scopus citations

Abstract

An efficient way to perform microwave-assisted switching of small ferromagnetic samples is studied. Magnetization reversals in cylindrical Yttrium Iron Garnet nanomagnets are simulated by applying a fixed-frequency transverse microwave field and a time-varying longitudinal applied field along the direction of the static field so as to continually match the precession frequency with the microwave frequency. The ideal form of microwave field is circularly polarized, and we also studied linearly polarized microwave fields since they are simpler to implement. Inhomogeneous modes nucleate in larger samples with dimensions several times larger than an exchange length which leads to incomplete switching.

Original language	English (US)
Article number	9265276
Journal	Ieee Transactions on Magnetics
Volume	57
Issue number	3
DOIs	https://doi.org/10.1109/TMAG.2020.3039468
State	Published - Mar 2021

Funding

This work was supported by the U.S. Department of Energy under Grant DE-SC0014424.

Keywords

Micromagnetic simulation
Pi pulses in a ferromagnet
Suhl instability
microwave assisted switching (MAS)
nonlinear FMR

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2020.3039468

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abstract = "An efficient way to perform microwave-assisted switching of small ferromagnetic samples is studied. Magnetization reversals in cylindrical Yttrium Iron Garnet nanomagnets are simulated by applying a fixed-frequency transverse microwave field and a time-varying longitudinal applied field along the direction of the static field so as to continually match the precession frequency with the microwave frequency. The ideal form of microwave field is circularly polarized, and we also studied linearly polarized microwave fields since they are simpler to implement. Inhomogeneous modes nucleate in larger samples with dimensions several times larger than an exchange length which leads to incomplete switching.",

keywords = "Micromagnetic simulation, Pi pulses in a ferromagnet, Suhl instability, microwave assisted switching (MAS), nonlinear FMR",

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AU - Lim, Jinho

AU - Zhang, Zhaohui

AU - Garg, Anupam

AU - Ketterson, John

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Y1 - 2021/3

N2 - An efficient way to perform microwave-assisted switching of small ferromagnetic samples is studied. Magnetization reversals in cylindrical Yttrium Iron Garnet nanomagnets are simulated by applying a fixed-frequency transverse microwave field and a time-varying longitudinal applied field along the direction of the static field so as to continually match the precession frequency with the microwave frequency. The ideal form of microwave field is circularly polarized, and we also studied linearly polarized microwave fields since they are simpler to implement. Inhomogeneous modes nucleate in larger samples with dimensions several times larger than an exchange length which leads to incomplete switching.

AB - An efficient way to perform microwave-assisted switching of small ferromagnetic samples is studied. Magnetization reversals in cylindrical Yttrium Iron Garnet nanomagnets are simulated by applying a fixed-frequency transverse microwave field and a time-varying longitudinal applied field along the direction of the static field so as to continually match the precession frequency with the microwave frequency. The ideal form of microwave field is circularly polarized, and we also studied linearly polarized microwave fields since they are simpler to implement. Inhomogeneous modes nucleate in larger samples with dimensions several times larger than an exchange length which leads to incomplete switching.

KW - Micromagnetic simulation

KW - Pi pulses in a ferromagnet

KW - Suhl instability

KW - microwave assisted switching (MAS)

KW - nonlinear FMR

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Simulating Resonant Magnetization Reversals in Nanomagnets

Abstract

Funding

Keywords

ASJC Scopus subject areas

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