Kondo effect in magnetic tunnel junction (MTJ) ?

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Kai Fauth

Hmmm, still of interest? Typically the Kondo effect is the result of magnetic impurities located within a metallic host. So I do not see, how a tunneling barrier (insulator, not a metal) would lend itself to studying Kondo physics.

Chao Zheng

Hi Professor Kai Fauth,

Thanks a lot for your reply. Yes. Actually, the presence of the Kondo effect in MTJs has been reported in several previous papers, as attached.

I observe the presence of the Kondo effect in our MTJ, and suppression and restoration of the Kondo effect can be experimentally achieved by altering the magnetization conﬁguration. This work is in press (attached: my work) but I'm still wondering the underlying physical mechanism. In our work, the magnetic impurities are believed to be formed at the interface between the ferromagnetic layer (CoFe) and the tunnel barrier (AlOx). The logarithmic temperature dependence of the MTJ is observed in parallel magnetization configuration and fitted well with the empirical expression. I'm confused why the impurities located at the interface can result in the Kondo effect as well, just like the impurities formed inside the metallic host. Are they essentially the same? May I have any suggestion?

Thank you very much again.