Spin valves with Conetic based synthetic ferrimagnet free layer

P. H. Chan; X. Li; Philip W.T. Pong

doi:10.1016/j.vacuum.2016.09.010

Spin valves with Conetic based synthetic ferrimagnet free layer

P. H. Chan, X. Li, Philip W.T. Pong

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

8 Scopus citations

Abstract

The detection of low magnetic field requires hysteresis-free magnetoresistive sensor with high sensitivity. Giant magnetoresistance spin valve (SV) sensors with CoFeB based synthetic antiferromagnetic (SAF) pinned layer and Conetic based synthetic ferrimagnet (SF) free layer are developed in this paper. Low free layer coercivity (H_C) of 0.27 Oe is achieved through adapting synthetic antiferromagnetic pinned layer in SV with Conetic single free layer. In SV with SAF pinned layer and SF free layer, the MR ratio, H_C, switching field (H_SW) and offset field (H_O) increase with the thickness of the Conetic alloy layer right above the Cu spacer. The H_C, H_O, and H_SW show oscillatory behavior with the Ru spacer thickness in the SF free layer. Through introducing CoFeB/SF free layer, an increased sensitivity of 0.27%/Oe and a small coercivity of 0.3 Oe are attained, which holds promise for low field sensing applications.

Original language	English (US)
Pages (from-to)	111-115
Number of pages	5
Journal	Vacuum
Volume	140
DOIs	https://doi.org/10.1016/j.vacuum.2016.09.010
State	Published - Jun 1 2017
Externally published	Yes

All Science Journal Classification (ASJC) codes

Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films

Keywords

Conetic
Giant magnetoresistance
Low coercevity
Low field sensing
Spin valve
Synthetic ferrimagnet

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10.1016/j.vacuum.2016.09.010

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@article{854f863ac3ca4246b253f758164d19e2,

title = "Spin valves with Conetic based synthetic ferrimagnet free layer",

abstract = "The detection of low magnetic field requires hysteresis-free magnetoresistive sensor with high sensitivity. Giant magnetoresistance spin valve (SV) sensors with CoFeB based synthetic antiferromagnetic (SAF) pinned layer and Conetic based synthetic ferrimagnet (SF) free layer are developed in this paper. Low free layer coercivity (HC) of 0.27 Oe is achieved through adapting synthetic antiferromagnetic pinned layer in SV with Conetic single free layer. In SV with SAF pinned layer and SF free layer, the MR ratio, HC, switching field (HSW) and offset field (HO) increase with the thickness of the Conetic alloy layer right above the Cu spacer. The HC, HO, and HSW show oscillatory behavior with the Ru spacer thickness in the SF free layer. Through introducing CoFeB/SF free layer, an increased sensitivity of 0.27%/Oe and a small coercivity of 0.3 Oe are attained, which holds promise for low field sensing applications.",

keywords = "Conetic, Giant magnetoresistance, Low coercevity, Low field sensing, Spin valve, Synthetic ferrimagnet",

author = "Chan, {P. H.} and X. Li and Pong, {Philip W.T.}",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier Ltd",

year = "2017",

month = jun,

day = "1",

doi = "10.1016/j.vacuum.2016.09.010",

language = "English (US)",

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T1 - Spin valves with Conetic based synthetic ferrimagnet free layer

AU - Chan, P. H.

AU - Li, X.

AU - Pong, Philip W.T.

PY - 2017/6/1

Y1 - 2017/6/1

N2 - The detection of low magnetic field requires hysteresis-free magnetoresistive sensor with high sensitivity. Giant magnetoresistance spin valve (SV) sensors with CoFeB based synthetic antiferromagnetic (SAF) pinned layer and Conetic based synthetic ferrimagnet (SF) free layer are developed in this paper. Low free layer coercivity (HC) of 0.27 Oe is achieved through adapting synthetic antiferromagnetic pinned layer in SV with Conetic single free layer. In SV with SAF pinned layer and SF free layer, the MR ratio, HC, switching field (HSW) and offset field (HO) increase with the thickness of the Conetic alloy layer right above the Cu spacer. The HC, HO, and HSW show oscillatory behavior with the Ru spacer thickness in the SF free layer. Through introducing CoFeB/SF free layer, an increased sensitivity of 0.27%/Oe and a small coercivity of 0.3 Oe are attained, which holds promise for low field sensing applications.

AB - The detection of low magnetic field requires hysteresis-free magnetoresistive sensor with high sensitivity. Giant magnetoresistance spin valve (SV) sensors with CoFeB based synthetic antiferromagnetic (SAF) pinned layer and Conetic based synthetic ferrimagnet (SF) free layer are developed in this paper. Low free layer coercivity (HC) of 0.27 Oe is achieved through adapting synthetic antiferromagnetic pinned layer in SV with Conetic single free layer. In SV with SAF pinned layer and SF free layer, the MR ratio, HC, switching field (HSW) and offset field (HO) increase with the thickness of the Conetic alloy layer right above the Cu spacer. The HC, HO, and HSW show oscillatory behavior with the Ru spacer thickness in the SF free layer. Through introducing CoFeB/SF free layer, an increased sensitivity of 0.27%/Oe and a small coercivity of 0.3 Oe are attained, which holds promise for low field sensing applications.

KW - Conetic

KW - Giant magnetoresistance

KW - Low coercevity

KW - Low field sensing

KW - Spin valve

KW - Synthetic ferrimagnet

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DO - 10.1016/j.vacuum.2016.09.010

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VL - 140

SP - 111

EP - 115

JO - Vacuum

JF - Vacuum

ER -

Spin valves with Conetic based synthetic ferrimagnet free layer

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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