Study on high-frequency 3-D magnetization precession modes of circular magnetic nano-dots using coplanar wave guide vector network analyzer ferromagnetic resonance

Kousaku Miyake; Seung Mo Noh; Tomoaki Kaneko; Hiroshi Imamura; Masashi Sahashi

doi:10.1109/TMAG.2012.2188134

Study on high-frequency 3-D magnetization precession modes of circular magnetic nano-dots using coplanar wave guide vector network analyzer ferromagnetic resonance

Kousaku Miyake, Seung Mo Noh, Tomoaki Kaneko, Hiroshi Imamura, Masashi Sahashi

ENG - Electronic Engineering

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

6 Citations (Scopus)

Abstract

Ferromagnetic resonance (FMR) modes for Fe ₇₀Co ₃₀ magnetic nano-dots of 100 nm in diameter in a mono-domain state are studied under different in-plane and out-of-plane magnetic fields using a reflection measurement from a vector network analyzer with a coplanar wave guide (CPW VNA FMR) and a micromagnetics simulation. The observed real and imaginary parts of the reflection signal become a combination of symmetric and antisymmetric Lorentzian forms in FMR. The combinations are given different susceptibility components of χ _xx and χ _zx by changing the sample position on the CPW. The magnetic dots exhibit triple modes in FMR spectra from an influence of the demagnetization field distribution in the mono-domain state. The magnetic dots also show a different variation of FMR amplitude in χ _xx and χ _zx for an out-of-plane field increase.

Original language	English
Article number	6187790
Pages (from-to)	1782-1788
Number of pages	7
Journal	IEEE Transactions on Magnetics
Volume	48
Issue number	5 PART 1
DOIs	https://doi.org/10.1109/TMAG.2012.2188134
Publication status	Published - 2012 May

Keywords

Ferromagnetic resonance
magnetic nano-dots
micromagnetics simulation
microwave assisted magnetic recording

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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Study on high-frequency 3-D magnetization precession modes of circular magnetic nano-dots using coplanar wave guide vector network analyzer ferromagnetic resonance. / Miyake, Kousaku; Noh, Seung Mo; Kaneko, Tomoaki; Imamura, Hiroshi; Sahashi, Masashi.

In: IEEE Transactions on Magnetics, Vol. 48, No. 5 PART 1, 6187790, 05.2012, p. 1782-1788.

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

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title = "Study on high-frequency 3-D magnetization precession modes of circular magnetic nano-dots using coplanar wave guide vector network analyzer ferromagnetic resonance",

abstract = "Ferromagnetic resonance (FMR) modes for Fe 70Co 30 magnetic nano-dots of 100 nm in diameter in a mono-domain state are studied under different in-plane and out-of-plane magnetic fields using a reflection measurement from a vector network analyzer with a coplanar wave guide (CPW VNA FMR) and a micromagnetics simulation. The observed real and imaginary parts of the reflection signal become a combination of symmetric and antisymmetric Lorentzian forms in FMR. The combinations are given different susceptibility components of χ xx and χ zx by changing the sample position on the CPW. The magnetic dots exhibit triple modes in FMR spectra from an influence of the demagnetization field distribution in the mono-domain state. The magnetic dots also show a different variation of FMR amplitude in χ xx and χ zx for an out-of-plane field increase.",

keywords = "Ferromagnetic resonance, magnetic nano-dots, micromagnetics simulation, microwave assisted magnetic recording",

author = "Kousaku Miyake and Noh, {Seung Mo} and Tomoaki Kaneko and Hiroshi Imamura and Masashi Sahashi",

note = "Funding Information: This work was partially supported by Storage Research Consortiums (SRC) and a NEDO grant.",

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AU - Noh, Seung Mo

AU - Kaneko, Tomoaki

AU - Imamura, Hiroshi

AU - Sahashi, Masashi

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N2 - Ferromagnetic resonance (FMR) modes for Fe 70Co 30 magnetic nano-dots of 100 nm in diameter in a mono-domain state are studied under different in-plane and out-of-plane magnetic fields using a reflection measurement from a vector network analyzer with a coplanar wave guide (CPW VNA FMR) and a micromagnetics simulation. The observed real and imaginary parts of the reflection signal become a combination of symmetric and antisymmetric Lorentzian forms in FMR. The combinations are given different susceptibility components of χ xx and χ zx by changing the sample position on the CPW. The magnetic dots exhibit triple modes in FMR spectra from an influence of the demagnetization field distribution in the mono-domain state. The magnetic dots also show a different variation of FMR amplitude in χ xx and χ zx for an out-of-plane field increase.

AB - Ferromagnetic resonance (FMR) modes for Fe 70Co 30 magnetic nano-dots of 100 nm in diameter in a mono-domain state are studied under different in-plane and out-of-plane magnetic fields using a reflection measurement from a vector network analyzer with a coplanar wave guide (CPW VNA FMR) and a micromagnetics simulation. The observed real and imaginary parts of the reflection signal become a combination of symmetric and antisymmetric Lorentzian forms in FMR. The combinations are given different susceptibility components of χ xx and χ zx by changing the sample position on the CPW. The magnetic dots exhibit triple modes in FMR spectra from an influence of the demagnetization field distribution in the mono-domain state. The magnetic dots also show a different variation of FMR amplitude in χ xx and χ zx for an out-of-plane field increase.

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KW - micromagnetics simulation

KW - microwave assisted magnetic recording

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