Parameter variation investigation of Magnetic Tunnel Junctions

Jian Feng Kong, Kwaku Eason, Kim Piew Tan, Rachid Sbiaa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Magnetic Tunnel Junction (MTJ) is a widely used spintronics structure in many applications. The tunneling magneto-resistance (TMR) is an important metric indicating MTJ sensitivity, and modeling this phenomenon is nontrivial, owing to the complicated nature of spin dependent tunneling. Deploying numerical tools such as OOMMF and SpinFlow3D software, which treats tunneling by way of a voltage-dependent areal conductance, we study properties of MTJs, such as TMR, varying a number of parameters, including MTJ stack taper angle, parameters of voltage-dependent areal conductance associated with the MgO barrier, and other parameters accessible in the model, including bias and coercive field behavior based on geometrical parameters. We find that a taper angle, which is a consequence of fabrication processes, has negligible effect on TMR. Additionally, it is shown that the current distributions in MTJs, when a bias voltage is applied, is actually nonuniform. We also show that introducing geometrical artifacts in the structure can strongly influence properties such as coercive and bias fields in MTJs.

Original languageEnglish
Title of host publication2012 Digest APMRC - Asia-Pacific Magnetic Recording Conference: A Strong Tradition. An Exciting New Look!
Publication statusPublished - 2012
Event2012 Asia-Pacific Magnetic Recording Conference: A Strong Tradition. An Exciting New Look!, APMRC 2012 - Singapore, Singapore
Duration: Oct 31 2012Nov 2 2012

Other

Other2012 Asia-Pacific Magnetic Recording Conference: A Strong Tradition. An Exciting New Look!, APMRC 2012
CountrySingapore
CitySingapore
Period10/31/1211/2/12

Keywords

  • areal conductance
  • magnetic tunnel junctions
  • micromagnetics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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    Kong, J. F., Eason, K., Tan, K. P., & Sbiaa, R. (2012). Parameter variation investigation of Magnetic Tunnel Junctions. In 2012 Digest APMRC - Asia-Pacific Magnetic Recording Conference: A Strong Tradition. An Exciting New Look! [6407561]