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http://www.m02group.com. Δ 1. Fe. AP. MgO. Cr. Fe. The effect of Cr interlayer in epitaxial Fe/MgO/Fe magnetic tunneling junctions by first principles calculations. J. Zhang, Y. Wang, X.-G. Zhang, X.F. Han. Group M02, State Key Laboratory of Magnetism Institute of Physics, CAS. Abstract.

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Http www m02group com

http://www.m02group.com

Δ1

Fe

AP

MgO

Cr

Fe

The effect of Cr interlayer in epitaxial Fe/MgO/Fe magnetic tunneling junctions by first principles calculations

J. Zhang, Y. Wang, X.-G. Zhang, X.F. Han

Group M02, State Key Laboratory of Magnetism

Institute of Physics, CAS

Abstract

The effect of Cr(001) interlayer in the single crystal Fe(001)/MgO/Cr (x=0–30 ML)/Fe magnetic tunneling junctions (MTJs) has been investigated by first-principles calculations. The tunneling magnetic resistance (TMR) oscillated with a 2 ML period as a function of the Cr(001) interlayer thickness. In some thickness range, the TMR oscillated between the positive and negative values and exhibit interesting odd-even effect.

Two feature of Cr (001):

P

  • There is no Δ1 band at the EF of Cr.The Δ1 electrons tunneling at the parallel state will be suppressed

  • Layered Antiferro-

  • magnetic structure on

  • Fe (001).

(1)The structure of Fe(001)/MgO(001)/Fe MTJ with Cr (001) interlayer

(2) The decrease and 2 ML periodic oscillation of TMR (a)and the oscillation of resistance area (RA) (b) in epitaxial Fe/MgO/Cr/Fe (Ref. 1) MTJ.

(3) Tunneling conductance GP and GAP (a) and MR ratio (b) of MTJ calculated by LKKR first principles method.

(4)The transmission distribution in two dimension Brillouin zones for P majority ((a)-(e)) and AP ((f)-(g)) with Cr interlayer increasing from 2 to 6 ML

Conclusions

Our first principles calculations show that the Cr (001) is a metallic barrier for Δ1 electrons tunneling which causes the decrease and negative MR. The AFM order of Cr (001) causes the oscillation of P and AP conductance with a period of 2 ML.

[1] Rie Matsumoto et al., Phys. Rev. B. 79 (2009) 174436.

[2] F. Greullet et al.,Phys. Rev. Lett. 99 (2007) 187202.

[3] J. Zhang,Y. Wang, X.-G. Zhang, X.F. Han, to be submitted.

This work was supported by MOST, NSFC and CAS.


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