All-metal current-perpendicular-to-plane giant magnetoresistance sensors for narrow-track magnetic recording

被引：68

作者：

Childress, J. R. ^{[1
]}

Carey, M. J. ^{[1
]}

Maat, S. ^{[1
]}

Smith, N. ^{[1
]}

Fontana, R. E. ^{[1
]}

Druist, D. ^{[1
]}

Carey, K. ^{[1
]}

Katine, J. A. ^{[1
]}

Robertson, N. ^{[1
]}

Boone, T. D. ^{[1
]}

Alex, M. ^{[1
]}

Moore, J. ^{[1
]}

Tsang, C. H. ^{[1
]}

机构：

[1] Hitachi Global Storage Technol, San Jose Res Ctr, San Jose, CA 95135 USA

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2008年 / 44卷 / 01期

关键词：

CPP-GMR; magnetic recording; read-head; spin-valve;

D O I：

10.1109/TMAG.2007.911019

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Read heads using current-perpendicular-to-plane (CPP) giant magnetoresistance sensors have been fabricated and tested under high-density recording conditions. A magnetoresistance of 5.5% and shield-to-shield spacing of 45 nm have been achieved by using an all-metal single-spin-valve with Heusler-alloy-based free and reference magnetic layers. Read heads with magnetic read widths similar to 45 nm were tested on perpendicular media, resulting in signals above 1 mV and signal-to-noise ratio similar to 30 dB. Linear densities in excess of 1050 kbpi were achieved with thermal fly-height control, compatible with recording areal densities of similar to 400 Gb/in(2). Current-induced spin-torque effects in the recording head were observed to result in rapid performance degradation above a threshold bias voltage of about 75 mV, corresponding to current densities > 10(8) A/cm(2).

引用

页码：90 / 94

页数：5

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