Angular dependence of low-frequency noise in Al 2 O 3-based magnetic tunnel junction sensors with conetic alloy

Z. Q. Lei; T. Zeng; G. Feng; P. J. Chen; P. T. Lai; Philip W.T. Pong

doi:10.1109/TMAG.2012.2196688

Angular dependence of low-frequency noise in Al ₂ O ₃-based magnetic tunnel junction sensors with conetic alloy

Z. Q. Lei, T. Zeng, G. Feng, P. J. Chen, P. T. Lai, Philip W.T. Pong

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

3 Scopus citations

Abstract

We demonstrated the noise performances of Al ₂O ₃-based magnetic tunnel junction sensors (MTJs) in the low-frequency regimes. Conetic alloy Ni ₇₇Fe ₁₄ Cu ₅Mo ₄ was deposited as both the MTJ pinned layer and free layer because of its superb magnetically soft properties. A rotating magnetic field was employed to investigate the angular dependence of the MTJ low-frequency noise. Hooge parameter was applied for parameterizing the low-frequency noise. The measurement results demonstrate that the Hooge parameters are angular-dependent and they exhibit a linear relation with respect to the angular magnetoresistive susceptibility. It can be also observed that the Hooge parameters possess a higher value when the Conetic MTJs are in the region of antiparallel state. These results indicate that the magnetic fluctuations in the ferromagnetic layers contribute to the low-frequency noise level in Conetic MTJ sensors.

Original language	English (US)
Article number	6332898
Pages (from-to)	3712-3714
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	48
Issue number	11
DOIs	https://doi.org/10.1109/TMAG.2012.2196688
State	Published - 2012
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Keywords

Conetic
Low-frequency noise
Magnetic sensors
Magnetic tunnel junction (MTJ)

Access to Document

10.1109/TMAG.2012.2196688

Cite this

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title = "Angular dependence of low-frequency noise in Al 2 O 3-based magnetic tunnel junction sensors with conetic alloy",

abstract = "We demonstrated the noise performances of Al 2O 3-based magnetic tunnel junction sensors (MTJs) in the low-frequency regimes. Conetic alloy Ni 77Fe 14 Cu 5Mo 4 was deposited as both the MTJ pinned layer and free layer because of its superb magnetically soft properties. A rotating magnetic field was employed to investigate the angular dependence of the MTJ low-frequency noise. Hooge parameter was applied for parameterizing the low-frequency noise. The measurement results demonstrate that the Hooge parameters are angular-dependent and they exhibit a linear relation with respect to the angular magnetoresistive susceptibility. It can be also observed that the Hooge parameters possess a higher value when the Conetic MTJs are in the region of antiparallel state. These results indicate that the magnetic fluctuations in the ferromagnetic layers contribute to the low-frequency noise level in Conetic MTJ sensors.",

keywords = "Conetic, Low-frequency noise, Magnetic sensors, Magnetic tunnel junction (MTJ)",

author = "Lei, {Z. Q.} and T. Zeng and G. Feng and Chen, {P. J.} and Lai, {P. T.} and Pong, {Philip W.T.}",

year = "2012",

doi = "10.1109/TMAG.2012.2196688",

language = "English (US)",

volume = "48",

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journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

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T1 - Angular dependence of low-frequency noise in Al 2 O 3-based magnetic tunnel junction sensors with conetic alloy

AU - Lei, Z. Q.

AU - Zeng, T.

AU - Feng, G.

AU - Chen, P. J.

AU - Lai, P. T.

AU - Pong, Philip W.T.

PY - 2012

Y1 - 2012

N2 - We demonstrated the noise performances of Al 2O 3-based magnetic tunnel junction sensors (MTJs) in the low-frequency regimes. Conetic alloy Ni 77Fe 14 Cu 5Mo 4 was deposited as both the MTJ pinned layer and free layer because of its superb magnetically soft properties. A rotating magnetic field was employed to investigate the angular dependence of the MTJ low-frequency noise. Hooge parameter was applied for parameterizing the low-frequency noise. The measurement results demonstrate that the Hooge parameters are angular-dependent and they exhibit a linear relation with respect to the angular magnetoresistive susceptibility. It can be also observed that the Hooge parameters possess a higher value when the Conetic MTJs are in the region of antiparallel state. These results indicate that the magnetic fluctuations in the ferromagnetic layers contribute to the low-frequency noise level in Conetic MTJ sensors.

AB - We demonstrated the noise performances of Al 2O 3-based magnetic tunnel junction sensors (MTJs) in the low-frequency regimes. Conetic alloy Ni 77Fe 14 Cu 5Mo 4 was deposited as both the MTJ pinned layer and free layer because of its superb magnetically soft properties. A rotating magnetic field was employed to investigate the angular dependence of the MTJ low-frequency noise. Hooge parameter was applied for parameterizing the low-frequency noise. The measurement results demonstrate that the Hooge parameters are angular-dependent and they exhibit a linear relation with respect to the angular magnetoresistive susceptibility. It can be also observed that the Hooge parameters possess a higher value when the Conetic MTJs are in the region of antiparallel state. These results indicate that the magnetic fluctuations in the ferromagnetic layers contribute to the low-frequency noise level in Conetic MTJ sensors.

KW - Conetic

KW - Low-frequency noise

KW - Magnetic sensors

KW - Magnetic tunnel junction (MTJ)

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