DocumentCode
1498758
Title
Magnetoresistance Ratio and Resistance Area Design of CPP-MR Film for 2–5 
Read Sensors
Author
Takagishi, Masayuki ; Yamada, Kenichiro ; Iwasaki, Hitoshi ; Fuke, Hiromi N. ; Hashimoto, Susumu
Author_Institution
R&D Center, Toshiba Corp., Kawasaki, Japan
Volume
46
Issue
6
fYear
2010
fDate
6/1/2010 12:00:00 AM
Firstpage
2086
Lastpage
2089
Abstract
We estimated the current perpendicular to plane (CPP)-magnetoresistance (MR) performance target required for hard disk drives (HDDs) with areal density from 2 to 5 Tb/in2 , considering spin transfer torque (STT) and thermal magnetic noise. It is found that the noise due to STT drastically affects the MR performance target for low resistance area (RA) film. Read elements with higher RA (around 0.1-0.3 ¿·¿m2 ) are preferable to control STT. In addition, thermal magnetic noise remained smaller than media magnetic noise for 2 Tb/in2 while it becomes comparable to media magnetic noise for 5 Tb/in2 , suggesting the necessity of a new method to control thermal magnetic noise.
Keywords
hard discs; magnetic noise; magnetic sensors; magnetic thin film devices; spin polarised transport; thermal noise; tunnelling magnetoresistance; CPP-MR film; areal density; hard disk drives; low resistance area; magnetoresistance ratio; media magnetic noise; read elements; read sensors; resistance area design; spin transfer torque; thermal magnetic noise; Giant magnetoresistance; Hard disks; Magnetic heads; Magnetic noise; Magnetic sensors; Magnetic shielding; Temperature dependence; Torque; Tunneling magnetoresistance; Voltage; Areal density; CPP-GMR; CPP-TMR; critical density; spin transfer torque; thermal magnetic noise;
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/TMAG.2010.2045739
Filename
5467501
Link To Document