Inter-grain tunneling conductivity of Sr2FeMoO6: effects of doping and grain-boundary modification

Oxygen cycling of Sr2Fe2–xMoxO6–δ (SFMO) samples allows the resistivity and low‐field magnetoresistance (LFMR) to be precisely cycled. TEM shows that the change in resistivity with oxygen is not only a consequence of the change in oxygen stoichiometry of SFMO, but also a concomitant change in the Fe/Mo ratio in SFMO. The figure shows the change in MR and resistivity (values in mΩ cm above the data points for samples D1–D7) with increasing post‐annealing time.

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Reversible Low‐Field Magnetoresistance in Sr₂Fe_2–_xMo_xO_6–δ by Oxygen Cycling and the Role of Excess Mo (x > 1) in Grain‐Boundary Regions

MacManus‐Driscoll

Sharma

Bugoslavsky

et al. 2006

Advanced Materials

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Magnetoresistance of Nanosized, Granular Sr₂FeMoO_6–δ–SrMoO₄ Core–Shell Structures

Suchaneck

Artiukh

2021

Physica Status Solidi (b)

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Herein, for the first time, a model is developed for the description of magnetoresistance in nanosized, granular Sr 2 FeMoO 6-δ -SrMoO 4 core-shell structures, which is based on the fluctuation-induced tunneling model. Parameters of the fluctuation-induced tunneling model of granular materials are calculated. The magnetic field is considered to affect the tunneling barrier height. The linear and quadratic coefficients of this effect are estimated.

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Resistivity and Tunnel Magnetoresistance in Double‐Perovskite Strontium Ferromolybdate Ceramics

Suchaneck

Artiukh²,

Gerlach

2022

Physica Status Solidi (b)

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The low‐field magnetoresistance properties in double‐perovskite strontium ferromolybdate core–shell structures arise from spin‐dependent tunneling through a barrier formed by the shell. It is strongly dependent on synthesis conditions. In this work, first, the resistivity behavior of granular strontium ferromolybdate ceramics comprising intergrain tunnel barriers is reviewed. Based on this generalization, the modification of the tunneling process with barrier thickness and interface conditions is demonstrated. For the first time, equations for the magnetoresistance in each special case are derived.

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Inter-grain tunneling conductivity of Sr2FeMoO6: effects of doping and grain-boundary modification

Cited by 8 publications

References 19 publications

Reversible Low‐Field Magnetoresistance in Sr₂Fe_2–_xMo_xO_6–δ by Oxygen Cycling and the Role of Excess Mo (x > 1) in Grain‐Boundary Regions

Reversible Low‐Field Magnetoresistance in Sr₂Fe_2–_xMo_xO_6–δ by Oxygen Cycling and the Role of Excess Mo (x > 1) in Grain‐Boundary Regions

Magnetoresistance of Nanosized, Granular Sr₂FeMoO_6–δ–SrMoO₄ Core–Shell Structures

Resistivity and Tunnel Magnetoresistance in Double‐Perovskite Strontium Ferromolybdate Ceramics

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Inter-grain tunneling conductivity of Sr2FeMoO6: effects of doping and grain-boundary modification

Cited by 8 publications

References 19 publications

Reversible Low‐Field Magnetoresistance in Sr2Fe2–xMoxO6–δ by Oxygen Cycling and the Role of Excess Mo (x > 1) in Grain‐Boundary Regions

Reversible Low‐Field Magnetoresistance in Sr2Fe2–xMoxO6–δ by Oxygen Cycling and the Role of Excess Mo (x > 1) in Grain‐Boundary Regions

Magnetoresistance of Nanosized, Granular Sr2FeMoO6–δ–SrMoO4 Core–Shell Structures

Resistivity and Tunnel Magnetoresistance in Double‐Perovskite Strontium Ferromolybdate Ceramics

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Product

Resources

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Reversible Low‐Field Magnetoresistance in Sr₂Fe_2–_xMo_xO_6–δ by Oxygen Cycling and the Role of Excess Mo (x > 1) in Grain‐Boundary Regions

Reversible Low‐Field Magnetoresistance in Sr₂Fe_2–_xMo_xO_6–δ by Oxygen Cycling and the Role of Excess Mo (x > 1) in Grain‐Boundary Regions

Magnetoresistance of Nanosized, Granular Sr₂FeMoO_6–δ–SrMoO₄ Core–Shell Structures