Enhanced magnetoresistance of permalloy/Al-oxide/cobalt tunnel junctions in the Coulomb blockade regime

Bruckl H, Reiss G, Vinzelberg H, Bertram M, Monch I, Schumann J (1998)
PHYSICAL REVIEW B 58(14): R8893-R8896.

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Abstract
We report on magnetotransport properties of arrays of cobalt/aluminum-oxide/permalloy tunnel junctions with lateral dimensions in the range of 100x200 nm(2). Due to the small capacitances, these devices show simultaneously a pronounced Coulomb blockade behavior at low temperatures and spin-dependent tunneling transport. The Coulomb blockade energies range from 0.1 to 2.6 meV. All tunnel junctions exhibiting Coulomb blockade behavior did also show a strong dependence of the tunnel current on an external magnetic field, i.e., a tunneling magnetoresistance. At temperatures below 100 K, the resistance changes up to 17% in magnetic fields of similar to 500 Oe. In addition to the known slight increase of the tunneling magnetoresistance with decreasing bias voltage, we found a strong enhancement in the Coulomb blockade regime. This enhancement is explained by cotunneling effects. Considerations towards possible application in devices are given. [S0163-1829(98)51938-8].
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Bruckl H, Reiss G, Vinzelberg H, Bertram M, Monch I, Schumann J. Enhanced magnetoresistance of permalloy/Al-oxide/cobalt tunnel junctions in the Coulomb blockade regime. PHYSICAL REVIEW B. 1998;58(14):R8893-R8896.
Bruckl, H., Reiss, G., Vinzelberg, H., Bertram, M., Monch, I., & Schumann, J. (1998). Enhanced magnetoresistance of permalloy/Al-oxide/cobalt tunnel junctions in the Coulomb blockade regime. PHYSICAL REVIEW B, 58(14), R8893-R8896.
Bruckl, H., Reiss, G., Vinzelberg, H., Bertram, M., Monch, I., and Schumann, J. (1998). Enhanced magnetoresistance of permalloy/Al-oxide/cobalt tunnel junctions in the Coulomb blockade regime. PHYSICAL REVIEW B 58, R8893-R8896.
Bruckl, H., et al., 1998. Enhanced magnetoresistance of permalloy/Al-oxide/cobalt tunnel junctions in the Coulomb blockade regime. PHYSICAL REVIEW B, 58(14), p R8893-R8896.
H. Bruckl, et al., “Enhanced magnetoresistance of permalloy/Al-oxide/cobalt tunnel junctions in the Coulomb blockade regime”, PHYSICAL REVIEW B, vol. 58, 1998, pp. R8893-R8896.
Bruckl, H., Reiss, G., Vinzelberg, H., Bertram, M., Monch, I., Schumann, J.: Enhanced magnetoresistance of permalloy/Al-oxide/cobalt tunnel junctions in the Coulomb blockade regime. PHYSICAL REVIEW B. 58, R8893-R8896 (1998).
Bruckl, H, Reiss, Günter, Vinzelberg, H, Bertram, M, Monch, I, and Schumann, J. “Enhanced magnetoresistance of permalloy/Al-oxide/cobalt tunnel junctions in the Coulomb blockade regime”. PHYSICAL REVIEW B 58.14 (1998): R8893-R8896.
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