QuantumATK Forum

QuantumATK => General Questions and Answers => Topic started by: Yu Hailin on January 20, 2011, 16:09

Title: Help! How to calculate the TMR values of Co2MnSi/MgO/Co2MnSi MTJ?
Post by: Yu Hailin on January 20, 2011, 16:09

Dear all,
     I have read a document about ATK (ATK_TutorialSession_Part2_Analysis.pdf, This document is easily downloaded by google search) and I am interesting for the calculation of TMR value (shown on page 26 of the document). But I am confused on the calculation of TMR when the bias voltage is zero. For zero bias voltage, there is no current. So it is hard to undertand.
Anyone can give me some advices? If you have the script, please give me (my e-mail: yuhailin@student.sysu.edu.cn).Thanks in advance!
Sincerely!
Yu Hailin

Title: Re: Help! How to calculate the TMR values of Co2MnSi/MgO/Co2MnSi MTJ?
Post by: ugglebot on January 24, 2011, 09:37

The TMR is defined from the conductance rather than the current, and the conductance is well-defined even at zero bias.

Title: Re: Help! How to calculate the TMR values of Co2MnSi/MgO/Co2MnSi MTJ?
Post by: nori on January 27, 2011, 05:14

Quote

If you have the script, please give me

Attached is the sample structure of Co2MnSi/MgO/Co2MnSi for ATK 10.8.
Please enjoy  ;)

Title: Re: Help! How to calculate the TMR values of Co2MnSi/MgO/Co2MnSi MTJ?
Post by: kstokbro on January 29, 2011, 07:56

You can also take the tutorial
Tutorial: spin transport in Fe-MgO-Fe
available from our website