Conducting ballistic magnetoresistance and tunneling magnetoresistance: Pinholes and tunnel barriers

García, N.
August 2000
Applied Physics Letters;8/28/2000, Vol. 77 Issue 9
Academic Journal
This letter shows that conducting ballistic and tunneling magnetoresistances have identical physical treatments and, therefore, it is not possible to distinguish whether an experiment is measuring, in oxide barriers, electron conduction through pinholes or tunneling because both types of conduction are governed by the same physics. Currents in both cases are calculated by matching wave functions at the electrodes (both are ballistic). Therefore, pinholes or small ballistic nanocontacts in the tunnel barrier allow conducting ballistic electrons that account for most of the current. We also show that, in the case of nonsuperconducting materials, e.g., magnetic materials, current-voltage characteristics are not suitable to distinguish one process from the other. © 2000 American Institute of Physics.


Related Articles

  • On the Theory of Giant Magnetoresistance (Longitudinal Current). Kravchenko, V. Ya. // JETP Letters;10/25/2001, Vol. 74 Issue 8, p425 

    The problem of conductivity of a multilayer sample (alternating magnetic and nonmagnetic metal layers) with a current parallel to its surfaces is solved using a set of kinetic equations. Conditions at which the conductivity variations associated with changes in the type of magnetization...

  • Theory of giant magnetoresistance in magnetic granular films. Shufeng Zhang // Applied Physics Letters;10/12/1992, Vol. 61 Issue 15, p1855 

    Examines the theory of giant magnetoresistance in magnetic granular films. Determination of conductivity of the granular films; Influence of magnetic fields on resistivity; Correlation between magnetoresistance and particle size.

  • Effective internal fields and magnetization buildup for magnetotransport in magnetic multilayered structures. Levy, Peter M.; Camblong, Horacio E.; Zhang, Shufeng // Journal of Applied Physics;5/15/1994, Vol. 75 Issue 10, p7076 

    Deals with a study which derived a set of equations that define the spin diffusion that is present when current is driven through inhomogeneous magnetic media through the Kubo formula for electric conductivity. Approaches to understanding magnetoresistance of magnetic multilayered structures;...

  • Interlayer Magnetoresistance in the Normal and Mixed States of a Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub y] Crystal with T[sub c] ≥ 91 K. Zavaritsky, V. N. // Journal of Experimental & Theoretical Physics;Apr2002, Vol. 94 Issue 4, p802 

    The effect of a strong magnetic field (B ≤ 55 T), applied perpendicularly to the basal plane of a Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub y] (BSCCO-2212) crystal with T[sub c] > 91 K, on the out-of-plane electric conductivity of the sample was studied under the conditions of controlled ohmic...

  • Exchange interaction and magnetoresistance in La[sub 2/3]Ca[sub 1/3]MnO[sub 3]: experiment and models. Beznosov, A. B.; Belevtsev, B. I.; Fertman, E. L.; Desnenko, V. A.; Naugle, D. G.; Rathnayaka, K. D. D.; Parasiris, A. // Low Temperature Physics;Jul2002, Vol. 28 Issue 7, p556 

    The magnetization M(T) and electrical resistivity ρ(T) of a La[sub 2/3]Ca[sub 1/3]MnO[sub 3] film have been studied in the temperature range 5 K≤T≤320 K in the magnetic field intervals 10 Oe≤H ≤400 Oe and 0≤H≤50 kOe, respectively. It is found that the...

  • Anisotropy of the hopping magnetoresistance of antiferromagnetic La[sub 2]CuO[sub 4+δ] single crystals. Belevtsev, B. I.; Dalakova, N. V.; Panfilov, A. S.; Braude, I. S.; Bondarenko, A. V. // Low Temperature Physics;Apr2003, Vol. 29 Issue 4, p300 

    The anisotropy of the hopping conductivity of antiferromagnetic La[SUB2]CuO[SUB4 + δ] single crystals with T[SUBN] ≈ 188 K is investigated in the temperature range 5-295 K and the anisotropy of their magnetoresistance, in the temperature range 5-55 K. The resistance is measured by the...

  • Magnetoresistance probe of spatial current variations in high-T[sub c].... Gausepohl, S.C.; Lee, Mark // Applied Physics Letters;8/28/1995, Vol. 67 Issue 9, p1313 

    Examines the average spatial current variation of the normal and supercurrent densities in high-temperature Josephson junctions. Analysis of current-voltage properties using magnetoresistance probing technique; Impedance properties of the junction in high magnetic field; Influence of the...

  • Giant magnetoresistance effect and electric conduction in amorphous-CoFeB/Cu/Co sandwiches. Jimbo, M.; Komiyama, K.; Tsunashima, S. // Journal of Applied Physics;4/15/1996, Vol. 79 Issue 8, p6237 

    Investigates the giant magnetoresistance effect and electric conduction in amorphous cobalt alloy layers. Potential applications of spin valve structures; Details on the experiment; Discussion on the results of the experiment.

  • Electrical Conductivity, Magnetoresistance, and Specific Heat of Oxygen-Deficient La[sub 0.67]Ca[sub 0.33]MnO[sub 3 – α] (0≤α < 0.4). Nikulin, E. I.; Egorov, V. M.; Baıkov, Yu. M.; Melekh, B. T.; Stepanov, Yu. P.; Zimkin, I. N. // Physics of the Solid State;May2002, Vol. 44 Issue 5, p920 

    This paper reports on a first study of the effect of oxygen content in La[sub 0.67]Ca[sub 0.33]MnO[sub 3 – α] on the electrical conductivity, magnetoresistance, and specific heat within a broad range of oxygen deficiency variation, 0≤α < 0.4. Preparation of a large quantity of...


Read the Article


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

Try another library?
Sign out of this library

Other Topics