Broadband mag-noise of patterned permalloy thin films

Hanqiao Zhang; Chaojiang Li; Ralu Divan; Axel Hoffmann; Pingshan Wang

doi:10.1109/TMAG.2010.2040071

Broadband mag-noise of patterned permalloy thin films

Hanqiao Zhang, Chaojiang Li, Ralu Divan, Axel Hoffmann, Pingshan Wang

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

Abstract

A Y-factor noise figure (NF) measurement method is developed to characterize high-frequency mag-noise of a 550 nm wide Permalloy strip array under different dc bias currents. The noise voltage density is obtained. The proposed lumped element transmission line model describes noise properties of the patterned Py array well. Measurement data show that rapid ferromagnetic resonance frequencies (FMR) shift induced by dc bias current is related to the excess magnetization fluctuation thermally created by the combined dc current Joule heating effects and orthogonal Oersted fields.

Original language	English (US)
Article number	5467411
Pages (from-to)	2442-2445
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	46
Issue number	6
DOIs	https://doi.org/10.1109/TMAG.2010.2040071
State	Published - Jun 2010
Externally published	Yes

Keywords

Magnetic noise
Patterned permalloy thin films
Y-factor method

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Online availability

10.1109/TMAG.2010.2040071

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title = "Broadband mag-noise of patterned permalloy thin films",

abstract = "A Y-factor noise figure (NF) measurement method is developed to characterize high-frequency mag-noise of a 550 nm wide Permalloy strip array under different dc bias currents. The noise voltage density is obtained. The proposed lumped element transmission line model describes noise properties of the patterned Py array well. Measurement data show that rapid ferromagnetic resonance frequencies (FMR) shift induced by dc bias current is related to the excess magnetization fluctuation thermally created by the combined dc current Joule heating effects and orthogonal Oersted fields.",

keywords = "Magnetic noise, Patterned permalloy thin films, Y-factor method",

author = "Hanqiao Zhang and Chaojiang Li and Ralu Divan and Axel Hoffmann and Pingshan Wang",

note = "Funding Information: This work was supported in part by the Army Research Office, Grant 2005567 and by the U.S. Department of Energy under Contract DE-AC02-06CH1357.",

year = "2010",

month = jun,

doi = "10.1109/TMAG.2010.2040071",

language = "English (US)",

volume = "46",

pages = "2442--2445",

journal = "IEEE Transactions on Magnetics",

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T1 - Broadband mag-noise of patterned permalloy thin films

AU - Zhang, Hanqiao

AU - Li, Chaojiang

AU - Divan, Ralu

AU - Hoffmann, Axel

AU - Wang, Pingshan

N1 - Funding Information: This work was supported in part by the Army Research Office, Grant 2005567 and by the U.S. Department of Energy under Contract DE-AC02-06CH1357.

PY - 2010/6

Y1 - 2010/6

N2 - A Y-factor noise figure (NF) measurement method is developed to characterize high-frequency mag-noise of a 550 nm wide Permalloy strip array under different dc bias currents. The noise voltage density is obtained. The proposed lumped element transmission line model describes noise properties of the patterned Py array well. Measurement data show that rapid ferromagnetic resonance frequencies (FMR) shift induced by dc bias current is related to the excess magnetization fluctuation thermally created by the combined dc current Joule heating effects and orthogonal Oersted fields.

AB - A Y-factor noise figure (NF) measurement method is developed to characterize high-frequency mag-noise of a 550 nm wide Permalloy strip array under different dc bias currents. The noise voltage density is obtained. The proposed lumped element transmission line model describes noise properties of the patterned Py array well. Measurement data show that rapid ferromagnetic resonance frequencies (FMR) shift induced by dc bias current is related to the excess magnetization fluctuation thermally created by the combined dc current Joule heating effects and orthogonal Oersted fields.

KW - Magnetic noise

KW - Patterned permalloy thin films

KW - Y-factor method

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Broadband mag-noise of patterned permalloy thin films

Abstract

Keywords

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