NDLI: Electrical Low-Frequency Noise in Tunneling Magnetoresitive Heads: Phenomena and Origins

Content Provider	IEEE Xplore Digital Library
Author	Klaassen, K.B.
Copyright Year	1965
Abstract	Tunneling magnetoresistive (TMR) heads have been observed to exhibit relatively large low-frequency noise. Observation in a saturating field reveals that a substantial part of this noise is of electrical origin. Two distinctly different electrical noise phenomena are observed: 1/f noise and random telegraph (RT) noise. 1/f noise appears in all heads, RT noise only in some. The magnitude of the noise tracks the device resistance and the electrical bias. Therefore, the question arises if it is caused by resistance fluctuations or by the electrical bias. To answer this question, the paper describes a measurement setup to determine the TMR device noise in thermodynamic equilibrium (no bias). It is concluded that at zero bias there is no electrical low-frequency noise; neither 1/f noise nor RT noise was detected. Further, the paper proposes an electroacoustic model for the origin of the 1/f noise and estimates the expected magnitude. For the RT noise, in addition to the well-known trapped charge blocking model, an electromigratory model is proposed to better cover all observed RT noise features
Sponsorship	IEEE Magnetics Society
Starting Page	663
Ending Page	670
Page Count	8
File Size	786225
File Format	PDF
ISSN	00189464
Volume Number	43
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Low-frequency noise Magnetic heads Tunneling magnetoresistance Electric resistance Saturation magnetization Telegraphy Fluctuations Electrical resistance measurement Noise measurement Thermodynamics tunneling magnetoresistive noise noise modeling $1/{\rm f}$ noise random telegraph noise
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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