Experimental measurements and analysis of thermal magnetization noise in GMR sensors

Author

Jin, Zhen ; Bertram, H. Neal ; Dakroub, Housan

Author_Institution

Center for Magnetic Recording Res., California Univ., San Diego, La Jolla, CA, USA

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

2265

Lastpage

2267

Abstract

High-frequency measurements and theoretical analysis of data on giant magnetoresistance thermal magnetization fluctuation noise are presented. An experimental setup for the measurement of this noise at high frequencies is proposed. The measured noise increases with bias current and demonstrates two distinct resonance peaks within 6 GHz. Damping parameters are extracted from resonance linewidth data. Small variations are seen within a given manufacturing batch of eight heads. Data fitting to the measured-noise power spectrum and comparison between eigenmode and Landau-Lifshitz-Gilbert theories.

Keywords

damping; giant magnetoresistance; magnetic heads; magnetic recording noise; magnetic sensors; magnetisation; magnetoresistive devices; thermal noise; GMR sensor; Landau-Lifshitz-Gilbert theory; damping parameter; eigenmode theory; high-frequency measurement; noise power spectrum; recording head; resonance linewidth; thermal magnetization fluctuation noise; Data analysis; Fluctuations; Frequency measurement; Giant magnetoresistance; Magnetic analysis; Magnetic resonance; Magnetic sensors; Magnetization; Noise measurement; Thermal sensors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.802685

Filename

1042157