NDLI: Broad-band noise spectroscopy of giant magnetoresistive read heads

Content Provider	IEEE Xplore Digital Library
Author	Klaassen, K.B. Xinzhi Xing van Peppen, J.C.L.
Copyright Year	1965
Abstract	This paper describes wide-band (1 MHz-10 GHz) thermal magnetic fluctuation (TMF) noise measurements conducted on magnetoresistive devices such as giant magnetoresistive (GMR) and tunnel junction magnetoresistive (TMR) heads. The paper discusses the instrumentation, as well as the corrections necessary to separate the TMF noise from the total noise as collected. It shows that the thermal electrical noise component of this total noise is not white, but approximately follows the small-signal resistance of a saturated sensor versus frequency. The paper gives examples of noise imaging using magnetic field sweeps and electrical bias sweeps, and interprets the results. As another application example, it shows that the signal-to-noise ratio of a GMR head does not improve if one replaces the free layer by a synthetic (double) free layer with the same net moment. It presents examples of multimode TMF spectra, together with the causes of these extra resonances: spatial standing spin waves in the free layer and pinned layer resonances. It shows how one can calculate the stiffening field, damping, and free layer dimensions (magnetically active height and width) from the TMF spectra. These parameters can be obtained in a nondestructive fashion. They are difficult to measure in other ways.
Sponsorship	IEEE Magnetics Society
Starting Page	2307
Ending Page	2317
Page Count	11
File Size	679924
File Format	PDF
ISSN	00189464
Volume Number	41
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spectroscopy Giant magnetoresistance Magnetic heads Magnetic noise Tunneling magnetoresistance Magnetic separation Saturation magnetization Thermal resistance Magnetic resonance Wideband thermal magnetic noise Ferromagnetic noise ferromagnetic resonance magnetoresistive (GMR) noise read head noise thermal electrical noise
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Spin-Torque Effect on Thermally Excited Magnetization Fluctuation Noise in Tunneling Magnetoresistive Read Heads

Simulation of noise, signal-to-noise and bandwidth of TMR and CIP/CPP GMR heads

Thermal and spin-torque noise in CPP (TMR and/or GMR) read sensors

Amplitude and Phase Distributions of Magnetization in Tunneling Magnetoresistive Heads

Influence of Stripe Height on Critical Current Density of Spin-Torque Noise in Tunneling Magnetoresistive Read Heads

Temperature Dependence of Thermally Activated Ferromagnetic Resonance in Tunneling Magnetoresistive Heads

Is Electrical 1/f Noise in Tunneling Magnetoresistive Heads a Form of Equilibrium Noise?

Effect of Current-Confined Path on Spin-Torque Noise in CPP-GMR Heads With Current Screen Layer

Angular dependence of spin torque critical currents for CPP-GMR read heads

Broad-band noise spectroscopy of giant magnetoresistive read heads

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Spin-Torque Effect on Thermally Excited Magnetization Fluctuation Noise in Tunneling Magnetoresistive Read Heads

Simulation of noise, signal-to-noise and bandwidth of TMR and CIP/CPP GMR heads

Thermal and spin-torque noise in CPP (TMR and/or GMR) read sensors

Amplitude and Phase Distributions of Magnetization in Tunneling Magnetoresistive Heads

Influence of Stripe Height on Critical Current Density of Spin-Torque Noise in Tunneling Magnetoresistive Read Heads

Temperature Dependence of Thermally Activated Ferromagnetic Resonance in Tunneling Magnetoresistive Heads

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Effect of Current-Confined Path on Spin-Torque Noise in CPP-GMR Heads With Current Screen Layer

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