Magnetocapacitance and exponential magnetoresistance in manganite–titanate heterojunctions

Nakagawa, N.; Asai, M.; Mukunoki, Y.; Susaki, T.; Hwang, H. Y.
February 2005
Applied Physics Letters;2/21/2005, Vol. 86 Issue 8, p082504
Academic Journal
We present a rectifying manganite–titanate heterojunction exhibiting a magnetic field tunable depletion layer. This creates a large positive magnetocapacitance, a direct measure of the field-induced reduction of the effective depletion width across the junction. Furthermore, the reduction of the junction barrier shifts the forward bias characteristics, giving exponentially enhanced differential magnetoresistance, occurring despite the absence of a spin filter. These results provide a unique probe of a Mott insulator/band insulator interface, and further suggest electronic devices incorporating the magnetic field sensitivity of these strongly correlated electron materials.


Related Articles

  • Control of resistance of a magnetoresistive manganite by spin injection. Ono, T.; Kogusu, A.; Morimoto, S.; Nasu, S.; Masuno, A.; Terashima, T.; Takano, M. // Applied Physics Letters;3/29/2004, Vol. 84 Issue 13, p2370 

    We report a spin-injection effect found for a manganite using a specially fabricated sample. A wire of La[sub 0.7]Sr[sub 0.3]MnO[sub 3] was patterned by means of focused ion beam etching, and the center was subsequently lightly irradiated with Ga[sup +] ions. The ferromagnetic Curie temperature...

  • Magnetoresistance of substituted lanthanum manganites La0.7Ca0.3MnO3 upon nonequilibrium overheating of carriers. Shaykhutdinov, K. A.; Semenov, S. V.; Popkov, S. I.; Balaev, D. A.; Bykov, A. A.; Dubrovskiy, A. A.; Petrov, M. I.; Volkov, N. V. // Journal of Applied Physics;Apr2011, Vol. 109 Issue 8, p083711 

    Current-voltage characteristics of the polycrystalline substituted lanthanum manganite La0.7Ca0.3MnO3 were experimentally studied at T = 77.4 K in magnetic fields up to 13 kOe. In these characteristics, a portion of negative differential resistivity was observed above a certain threshold value...

  • Phase Competition in Transition Metal Oxides. Moreo, Adriana // AIP Conference Proceedings;2006, Vol. 816 Issue 1, p142 

    The properties of manganites, exhibiting colossal magnetoresistance, and high critical temperature cuprates are studied numerically using a variety of microscopic and phenomenological models. Inhomogeneous ground states are discovered in many regions of parameter space. It is shown how colossal...

  • Magnetic field dependent evolution of band structure in La1-xCaxMnO3 (x=0.18 and 0.30). Zhou, T. F.; Li, G.; Qian, T.; Li, X. G. // Applied Physics Letters;11/27/2006, Vol. 89 Issue 22, p222504 

    Probing of the evolution of electronic structure in magnetic field is a key issue for the design and realization of manganite-based devices. Here, the shift of the maximum (or minimum) position in unusual magnetoresistance (MR) versus V curves of the heterojunctions composed of La1-xCaxMnO3...

  • 1000% colossal magnetoresistance at room temperature in the A-site ordered perovskite manganites, Sm1-xLax+yBa1-yMn2O6. Nakajima, Tomohiko; Ueda, Yutaka // Journal of Applied Physics;8/15/2005, Vol. 98 Issue 4, p046108 

    We report colossal magnetoresistance at room temperature by introducing disorder to the A-site ordered manganites, SmBaMn2O6. SmBaMn2O6 shows the metal to CE-type charge/orbital ordered insulator transition at 375 K above room temperature. We have achieved a magnetoresistance effect of 340% at...

  • Thickness dependence of the mobility at the LaAlO3/SrTiO3 interface. Bell, C.; Harashima, S.; Hikita, Y.; Hwang, H. Y. // Applied Physics Letters;6/1/2009, Vol. 94 Issue 22, p222111 

    The electronic transport properties of a series of LaAlO3/SrTiO3 interfaces were investigated, and a systematic thickness dependence of the sheet resistance and magnetoresistance was found for constant growth conditions. This trend occurs above the critical thickness of four unit cells, below...

  • Designed synthesis of materials for high-sensitivity geomagnetic sensors. Ding, L.; Teng, J.; Wang, X. C.; Feng, C.; Jiang, Y.; Yu, G. H.; Wang, S. G.; Ward, R. C. C. // Applied Physics Letters;2/1/2010, Vol. 96 Issue 5, p052515 

    A structure of Ta/MgO/NiFe/MgO/Ta was designed and synthesized, which combines the advantages of both tunnel magnetoresistance materials with high magnetic field sensitivity and anisotropic magnetoresistance materials with high directional sensitivity. The magnetoresistance ratio in the device...

  • Rashba spin-orbit effect on the zero conductance and the magnetoresistance of a quantum ring. Dong, Yan-Kun; Li, Yu-Xian // Journal of Applied Physics;Jun2008, Vol. 103 Issue 11, p113716 

    Using a mode matched scattering matrix method, we study the effect of Rashba spin-orbit coupling and a tunnel barrier on the zero conductance and the tunnel magnetoresistance (TMR) in a one-dimensional conducting Aharonov–Bohm ring symmetrically coupled to two ferromagnetic leads. It is...

  • Microscopic structures of MgO barrier layers in single-crystal Fe/MgO/Fe magnetic tunnel junctions showing giant tunneling magnetoresistance. Mizuguchi, M.; Suzuki, Y.; Nagahama, T.; Yuasa, S. // Applied Physics Letters;6/19/2006, Vol. 88 Issue 25, p251901 

    The microscopic structures of MgO(001) barrier layers in magnetic tunnel junctions showing giant tunneling magnetoresistance were characterized by in situ scanning tunneling microscopy. The MgO thin films formed exceedingly flat surfaces, and their terraces were made even flatter by annealing...


Read the Article


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

Try another library?
Sign out of this library

Other Topics