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QuantumATK => General Questions and Answers => Topic started by: karn on November 12, 2014, 11:29

Title: Zero bias TMR
Post by: karn on November 12, 2014, 11:29

Hello,

I am trying to calculate TMR and Spin- Injection factor(n) for a two terminal device(FM-semiconductor-FM) at different biases. Here TMR is defined as (Ipc-Iapc)/Iapc and n is defined as (Idown - Iup)/(Idown + Iup), where Ipc=total current in parallel config, Iapc=total current in anti-parallel config, Idown=Down spin current and Iup=Up spin current. As we all know at the bias of 0.0V, all currents are zero and hence we gotta use equilibrium conductance and corresponding currents(I know this from one paper) . So my question is how do we calculate this equilibrium conductance and corresponding currents at the bias of 0.0V in Atomistix Toolkit?

Title: Re: Zero bias TMR
Post by: kstokbro on November 13, 2014, 00:11

Check the tutorial
http://www.quantumwise.com/documents/tutorials/latest/Fe-MgO-Fe/index.html/

You can also query a transmission spectrum for the conductance,
check:
http://www.quantumwise.com/documents/manuals/latest/ReferenceManual/index.html/ref.transmissionspectrum.html