Influence of stripe height on critical current density of spin-torque noise in tunneling magnetoresistive read heads

Yasushi Endo; Akira Hotta; Masahiro Yamaguchi

doi:10.1109/TMAG.2013.2245312

Influence of stripe height on critical current density of spin-torque noise in tunneling magnetoresistive read heads

Yasushi Endo, Akira Hotta, Masahiro Yamaguchi

ENG - Electrical Engineering

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

2 Citations (Scopus)

Abstract

This paper describes the influence of the stripe height on the critical current density of the spin-torque (ST) noise in the TMR heads using the GHz range noise spectra in detail. The critical current density above which the non-thermal fluctuation noise originates from the ST slightly increases, linearly decreases, becomes minimum, and further keeps constant as the stripe height is reduced. This result means that no trend of j_c appears for the stripe height. The average critical current density is approximately +4.70 ± 1.1 × 10¹¹ A/m², suggesting that the non-thermal fluctuation noise by the ST in the TMR head is independent of the stripe height and occurs at the current density of 10¹¹ A/m ². This result also suggests that this non-thermal fluctuation noise will become a serious problem for the HDD in the near future.

Original language	English
Article number	6559238
Pages (from-to)	3745-3747
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	49
Issue number	7
DOIs	https://doi.org/10.1109/TMAG.2013.2245312
Publication status	Published - 2013 Aug 2

Keywords

Critical current density
Spin-torque
Thermal mag-noise
Tunneling magnetoresistive (TMR) read head

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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title = "Influence of stripe height on critical current density of spin-torque noise in tunneling magnetoresistive read heads",

abstract = "This paper describes the influence of the stripe height on the critical current density of the spin-torque (ST) noise in the TMR heads using the GHz range noise spectra in detail. The critical current density above which the non-thermal fluctuation noise originates from the ST slightly increases, linearly decreases, becomes minimum, and further keeps constant as the stripe height is reduced. This result means that no trend of jc appears for the stripe height. The average critical current density is approximately +4.70 ± 1.1 × 1011 A/m2, suggesting that the non-thermal fluctuation noise by the ST in the TMR head is independent of the stripe height and occurs at the current density of 1011 A/m 2. This result also suggests that this non-thermal fluctuation noise will become a serious problem for the HDD in the near future.",

keywords = "Critical current density, Spin-torque, Thermal mag-noise, Tunneling magnetoresistive (TMR) read head",

author = "Yasushi Endo and Akira Hotta and Masahiro Yamaguchi",

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AU - Hotta, Akira

AU - Yamaguchi, Masahiro

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N2 - This paper describes the influence of the stripe height on the critical current density of the spin-torque (ST) noise in the TMR heads using the GHz range noise spectra in detail. The critical current density above which the non-thermal fluctuation noise originates from the ST slightly increases, linearly decreases, becomes minimum, and further keeps constant as the stripe height is reduced. This result means that no trend of jc appears for the stripe height. The average critical current density is approximately +4.70 ± 1.1 × 1011 A/m2, suggesting that the non-thermal fluctuation noise by the ST in the TMR head is independent of the stripe height and occurs at the current density of 1011 A/m 2. This result also suggests that this non-thermal fluctuation noise will become a serious problem for the HDD in the near future.

AB - This paper describes the influence of the stripe height on the critical current density of the spin-torque (ST) noise in the TMR heads using the GHz range noise spectra in detail. The critical current density above which the non-thermal fluctuation noise originates from the ST slightly increases, linearly decreases, becomes minimum, and further keeps constant as the stripe height is reduced. This result means that no trend of jc appears for the stripe height. The average critical current density is approximately +4.70 ± 1.1 × 1011 A/m2, suggesting that the non-thermal fluctuation noise by the ST in the TMR head is independent of the stripe height and occurs at the current density of 1011 A/m 2. This result also suggests that this non-thermal fluctuation noise will become a serious problem for the HDD in the near future.

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