Reduced magnetic coercivity and switching field in NiFeCuMo/Ru/NiFeCuMo synthetic-ferrimagnetic nanodots

X. Li; Chi Wah Leung; C. C. Chiu; K. W. Lin; Mansun Chan; Y. Zhou; Philip W.T. Pong

doi:10.1016/j.apsusc.2017.03.094

Reduced magnetic coercivity and switching field in NiFeCuMo/Ru/NiFeCuMo synthetic-ferrimagnetic nanodots

X. Li, Chi Wah Leung, C. C. Chiu, K. W. Lin, Mansun Chan, Y. Zhou, Philip W.T. Pong

Research output: Journal article publication › Journal article › Academic research › peer-review

2 Citations (Scopus)

Abstract

The coercivity (Hc) and switching field (Hsw) of free layers increase remarkably with shrinking structural dimensions, reducing the sensitivity of nanosized magnetoresistive sensors. In this work, conetic-alloy (NiFeCuMo) synthetic ferrimagnetic (SyF) trilayers are proposed to reduce Hcand Hswin magnetic nanostructures. SyF stacks of NiFeCuMo/Ru/NiFeCuMo were patterned into nanodot arrays with diameter of 60 nm by nanosphere lithography. The thickness of Ru layer was chosen so that high interlayer coupling energy existed in the continuous film. The linear dependence of Hcand Hswof SyF nanodot on the amplification factor was revealed. Magnetic field annealing was conducted at various temperatures (Tan) ranging from 373 K to 673 K. Annealing at low temperature (Tan ≤ 473 K) relaxed the structural disorders, resulting in reduced surface roughness and decreased Hcand Hsw. Higher Tanchanged the preferred orientations in the crystalline structures, leading to increased roughness and higher Hcand Hsw. This work shows that the Hcand Hswof nanostructures can be reduced through engaging Conetic alloy in SyF stack. The Conetic-alloy-based SyF structures are a promising candidate as free layers in nanosized spintronic devices.

Original language	English
Pages (from-to)	479-484
Number of pages	6
Journal	Applied Surface Science
Volume	410
DOIs	https://doi.org/10.1016/j.apsusc.2017.03.094
Publication status	Published - 15 Jul 2017

Keywords

Nanodots
Nanosphere lithography
Synthetic-ferrimagnetic

ASJC Scopus subject areas

Surfaces, Coatings and Films

More information

10.1016/j.apsusc.2017.03.094

http://hdl.handle.net/10397/100394

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title = "Reduced magnetic coercivity and switching field in NiFeCuMo/Ru/NiFeCuMo synthetic-ferrimagnetic nanodots",

abstract = "The coercivity (Hc) and switching field (Hsw) of free layers increase remarkably with shrinking structural dimensions, reducing the sensitivity of nanosized magnetoresistive sensors. In this work, conetic-alloy (NiFeCuMo) synthetic ferrimagnetic (SyF) trilayers are proposed to reduce Hcand Hswin magnetic nanostructures. SyF stacks of NiFeCuMo/Ru/NiFeCuMo were patterned into nanodot arrays with diameter of 60 nm by nanosphere lithography. The thickness of Ru layer was chosen so that high interlayer coupling energy existed in the continuous film. The linear dependence of Hcand Hswof SyF nanodot on the amplification factor was revealed. Magnetic field annealing was conducted at various temperatures (Tan) ranging from 373 K to 673 K. Annealing at low temperature (Tan ≤ 473 K) relaxed the structural disorders, resulting in reduced surface roughness and decreased Hcand Hsw. Higher Tanchanged the preferred orientations in the crystalline structures, leading to increased roughness and higher Hcand Hsw. This work shows that the Hcand Hswof nanostructures can be reduced through engaging Conetic alloy in SyF stack. The Conetic-alloy-based SyF structures are a promising candidate as free layers in nanosized spintronic devices.",

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AU - Li, X.

AU - Leung, Chi Wah

AU - Chiu, C. C.

AU - Lin, K. W.

AU - Chan, Mansun

AU - Zhou, Y.

AU - Pong, Philip W.T.

PY - 2017/7/15

Y1 - 2017/7/15

N2 - The coercivity (Hc) and switching field (Hsw) of free layers increase remarkably with shrinking structural dimensions, reducing the sensitivity of nanosized magnetoresistive sensors. In this work, conetic-alloy (NiFeCuMo) synthetic ferrimagnetic (SyF) trilayers are proposed to reduce Hcand Hswin magnetic nanostructures. SyF stacks of NiFeCuMo/Ru/NiFeCuMo were patterned into nanodot arrays with diameter of 60 nm by nanosphere lithography. The thickness of Ru layer was chosen so that high interlayer coupling energy existed in the continuous film. The linear dependence of Hcand Hswof SyF nanodot on the amplification factor was revealed. Magnetic field annealing was conducted at various temperatures (Tan) ranging from 373 K to 673 K. Annealing at low temperature (Tan ≤ 473 K) relaxed the structural disorders, resulting in reduced surface roughness and decreased Hcand Hsw. Higher Tanchanged the preferred orientations in the crystalline structures, leading to increased roughness and higher Hcand Hsw. This work shows that the Hcand Hswof nanostructures can be reduced through engaging Conetic alloy in SyF stack. The Conetic-alloy-based SyF structures are a promising candidate as free layers in nanosized spintronic devices.

AB - The coercivity (Hc) and switching field (Hsw) of free layers increase remarkably with shrinking structural dimensions, reducing the sensitivity of nanosized magnetoresistive sensors. In this work, conetic-alloy (NiFeCuMo) synthetic ferrimagnetic (SyF) trilayers are proposed to reduce Hcand Hswin magnetic nanostructures. SyF stacks of NiFeCuMo/Ru/NiFeCuMo were patterned into nanodot arrays with diameter of 60 nm by nanosphere lithography. The thickness of Ru layer was chosen so that high interlayer coupling energy existed in the continuous film. The linear dependence of Hcand Hswof SyF nanodot on the amplification factor was revealed. Magnetic field annealing was conducted at various temperatures (Tan) ranging from 373 K to 673 K. Annealing at low temperature (Tan ≤ 473 K) relaxed the structural disorders, resulting in reduced surface roughness and decreased Hcand Hsw. Higher Tanchanged the preferred orientations in the crystalline structures, leading to increased roughness and higher Hcand Hsw. This work shows that the Hcand Hswof nanostructures can be reduced through engaging Conetic alloy in SyF stack. The Conetic-alloy-based SyF structures are a promising candidate as free layers in nanosized spintronic devices.

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Reduced magnetic coercivity and switching field in NiFeCuMo/Ru/NiFeCuMo synthetic-ferrimagnetic nanodots

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