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Large tunnel magnetoresistance with plasma oxidized MgO barrier
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10.1063/1.2077847
/content/aip/journal/jap/98/7/10.1063/1.2077847
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/7/10.1063/1.2077847
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

A typical AFM image of the topography of the MgO barrier.

Image of FIG. 2.
FIG. 2.

(a) HRTEM micrograph of the multilayer stack, showing polycrystalline CoFe FM electrodes and MgO tunnel barrier. Lattice fringes can be resolved for all layers except for the CoFeB. (b) and (c) Fast Fourier transform (FFT) of the regions of the HRTEM image indicated by “1” and “2.” Lattice planes in the MgO barrier can be distinguished, with a predominant [001] orientation.

Image of FIG. 3.
FIG. 3.

Easy axis major (a) and minor (b) magnetization loops of the continuous multilayer stack.

Image of FIG. 4.
FIG. 4.

The variation of TMR (a) and product (b) for electrode alignment vs Mg film thickness and oxidation time .

Image of FIG. 5.
FIG. 5.

TMR minor loops, measured at RT, for junctions, with the magnetic field aligned to the long axis of the element (exchange bias direction) and a bias voltage of 20 mV ( and ).

Image of FIG. 6.
FIG. 6.

(a) Current-bias and dynamic conductance-bias characteristics for electrode alignment. The latter is fitted to the model of Brinkman for tunneling. (b) The variation of TMR as a function of bias.

Image of FIG. 7.
FIG. 7.

The variation of TMR (엯) and product for (◻) and AP (∎) electrode alignment as a function of the annealing temperature, , for annealing time . Lines are guides to the eye.

Image of FIG. 8.
FIG. 8.

The variation of TMR (엯) and product for (◻) and AP (∎) electrode alignment as a function of the annealing time, , for annealing temperature . Lines are guides to the eye.

Image of FIG. 9.
FIG. 9.

(a) Switching field asteroid acquired by magneto-optical Kerr effect for elliptical shaped elements of . (b) Easy axis hysteresis minor loop.

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/content/aip/journal/jap/98/7/10.1063/1.2077847
2005-10-06
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Large tunnel magnetoresistance with plasma oxidized MgO barrier
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/7/10.1063/1.2077847
10.1063/1.2077847
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