Magnetic tunnel junctions with a zinc oxide–cobalt oxide composite tunnel barrier

Le Brizoual, L.; Alnot, P.; Hehn, M.; Montaigne, F.; Alnot, M.; Schuhl, A.; Snoeck, E.
March 2005
Applied Physics Letters;3/14/2005, Vol. 86 Issue 11, p112505
Academic Journal
Composite CoO–ZnO tunnel junctions showing nonlinear and asymmetric current-voltage characteristics with significant magnetoresistance ratios (up to 8% at 77 K) have been prepared by using reactive sputtering from a zinc target. Electron transmission microscopy demonstrates the formation of a zinc oxide–cobalt oxide bilayer. Observed asymmetries, which are directly linked to the difference in zinc oxide and cobalt oxide barrier heights are in good agreement with calculations done within the framework of a parabolic bands model, using thicknesses extracted from transmission electron microscopy (TEM) images and barrier heights found in literature.


Related Articles

  • Atomic-scale structural analyses of epitaxial Co/Re superlattices. Wentao Xu; De Long, Lance E.; Charlton, Timothy; Chisholm, Matthew; Lederman, David // Applied Physics Letters;11/1/2004, Vol. 85 Issue 18, p4082 

    High-resolution transmission electron microscopy and scanning transmission electron microscopy (STEM) have been used to investigate atomic-scale structural properties of Co/Re trilayers and superlattices grown via magnetron sputtering. The sample growth was epitaxial with the (1010) plane of Co...

  • Highly disordered intergrowths in Sr2FeMoO6. Liao, X. Z.; Sharma, A.; Wei, M.; MacManus-Driscoll, J. L.; Branford, W.; Cohen, L. F.; Bugoslavsky, Y.; Zhu, Y. T.; Peterson, D. E.; Jiang, Y. B.; Xu, H. F. // Journal of Applied Physics;12/15/2004, Vol. 96 Issue 12, p7747 

    Two Sr2FeMoO6 samples, synthesized under different conditions and showing very different magnetotransport properties, were analyzed using transmission electron microscopy. The different magnetoresistive behaviors observed in the two samples coincide with the formation of different amounts of...

  • Transmission electron microscopy study on the polycrystalline CoFeB/MgO/CoFeB based magnetic tunnel junction showing a high tunneling magnetoresistance, predicted in single crystal magnetic tunnel junction. Choi, Y. S.; Tsunekawa, K.; Nagamine, Y.; Djayaprawira, D. // Journal of Applied Physics;1/1/2007, Vol. 101 Issue 1, p013907 

    We carried out a detailed transmission electron microscopy study on the polycrystalline CoFeB/MgO/CoFeB based magnetic tunnel junction, which shows high magnetoresistance predicted theoretically only in single crystal magnetic tunnel junction. Previously it has been suggested that the...

  • Small-size ZnO/MgO quantum systems with zinc oxide nanoparticles of controlled size. Didenko, O.; Strizhak, P.; Kosmambetova, G. // Theoretical & Experimental Chemistry;May2007, Vol. 43 Issue 3, p198 

    A method is proposed for the preparation of nanosized ZnO/MgO systems by the deposition of previously formed zinc oxide nanoparticles onto a support from a colloidal solution and for determination of the size of the deposited ZnO particles from the electronic spectra. The morphology of...

  • Interface characterization in Pd–Fe–Al(oxide)–Fe systems using conversion electron mössbauer spectroscopy. Schmitt, H.; Stahl, B.; Ghafari, M.; Hahn, H. // Journal of Applied Physics;6/1/2005, Vol. 97 Issue 11, p113902 

    A Fe–Al(oxide)-bilayer was deposited on a thermally oxidized and Pd-buffered Si substrate. In order to elucidate the structural and magnetic properties of the insulators lower interface by Mössbauer spectroscopy, a thin 57Fe tracer was placed at the Al(oxide) interface. Conversion...

  • Two-peak feature of the permittivity spectra of ferromagnetic microwire/rubber composites. Qin, F. X.; Quéré, Y.; Brosseau, C.; Wang, H.; Liu, J. S.; Sun, J. F.; Peng, H. X. // Applied Physics Letters;3/25/2013, Vol. 102 Issue 12, p122903 

    The effective permittivity of CoFeSiB microwire/rubber composites is investigated in the microwave range of frequencies. As the frequency is varied between 0.3 and 6 GHz with or without magnetic field excitation, we identify a two-peak structure of the permittivity spectra. This spectral feature...

  • Fullerene as electrical hinge. Wan, Neng; Perriat, Pascal; Sun, Li-Tao; Huang, Qing-An; Sun, Jun; Xu, Tao // Applied Physics Letters;5/7/2012, Vol. 100 Issue 19, p193111 

    The current study demonstrates that fullerenes with sizes between 1.9 nm and 3.3 nm serve as an efficient electrical hinges for interconnecting sub-5 nm carbon nanotubes (CNTs). Three modes of such 'soft connections' were validated via transmission electron microscopy employing in-situ...

  • Dielectric response and structure of in-plane tensile strained BaTiO3 thin films grown on the LaNiO3 buffered Si substrate. Qiao, Liang; Bi, Xiaofang // Applied Physics Letters;2/11/2008, Vol. 92 Issue 6, p062912 

    Highly (001)-textured BaTiO3 films were grown epitaxially on the LaNiO3 buffered Si substrate. A strong in-plane tensile strain has been revealed by using x-ray diffraction and high resolution transmission electron microscopy. The BaTiO3 film has exhibited a small remnant polarization,...

  • Manganese-doped zinc oxide tetratubes and their photoluminescent properties. Xu, C. X.; Sun, X. W.; Dong, Z. L.; Tan, S. T.; Cui, Y. P.; Wang, B. P. // Journal of Applied Physics;12/1/2005, Vol. 98 Issue 11, p113513 

    Based on vapor-phase transport method, manganese-doped zinc oxide (ZnO:Mn) tetropod whiskers were fabricated. The pods of the ZnO:Mn whiskers show hexagonal hollow shape with multitips at the front. X-ray diffraction and high-resolution transmission electron microscopy demonstrate that the tube...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics