MR ratio and RA design of CPP-MR film for over 2Tb/in^2 read sensors

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  • 1平方インチあたり2テラビット以上の記録密度でのCPP-MR素子の要求特性(記録システムおよび一般)
  • 1平方インチあたり2テラビット以上の記録密度でのCPP-MR素子の要求特性
  • 1ヘイホウ インチ アタリ 2 テラビット イジョウ ノ キロク ミツド デ ノ CPP MR ソシ ノ ヨウキュウ トクセイ

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Abstract

We estimated the current perpendicular to plane (CPP)-MR performance target required for HDD with areal density from 2Tb/in^2 to 5Tb/in^2, 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 RA film. Read elements with higher RA (around 0.1-0.3Ω・μm^2) are preferable to control STT. In addition, thermal magnetic noise remained smaller than media magnetic noise for 2Tb/in2 while it becomes comparable to media magnetic noise for 5Tb/in^2, suggesting the necessity of a new method to control thermal magnetic noise.

Journal

  • ITE Technical Report

    ITE Technical Report 34.20 (0), 13-19, 2010

    The Institute of Image Information and Television Engineers

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