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Current-Driven Magnetoresistance Oscillations in Asymmetric Spin Valves

100%

Gmitra M., BarnaŚ J.

Acta Physica Polonica A

2007

vol. 112

issue 6

1267-1270

Within the macroscopic model we have calculated spin-transfer torque in asymmetric spin valves in the diffusive transport limit.Such systems exhibit a non-standard angular dependence of the torque, which leads to current-induced precessional modes at zero external magnetic field. We have found that the frequency of magnetoresistance oscillations exhibits hysteretic behavior when the system is driven between two steady precessional regimes. A finite temperature can suppress the irreversibility and give rise to bistable regime where, both the precessional regimes coexist.

Spin-Dependent Phenomena in Magnetoelectronic Devices

61%

BarnaŚ J., Gmitra M., Rudziński W., Wawrzyniak M., Dugaev V., Kunert H.

Acta Physica Polonica A

2007

vol. 112

issue 6

1259-1265

Spin effects in electronic transport properties of artificial magnetic structures, like nanopillar spin valves, tunnel junctions, mesoscopic double-barrier junctions (single-electron transistors) are briefly discussed. Two classes of spin effects are distinguished; i.e. magnetoresistance phenomena due to magnetization rotation, and current-induced magnetic switching and magnetic dynamics.

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2 Acta Physica Polonica A

2 2007

2 BarnaŚ J.

2 Gmitra M.

1 Dugaev V.

1 Kunert H.

1 Rudziński W.

1 Wawrzyniak M.

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Current-Driven Magnetoresistance Oscillations in Asymmetric Spin Valves

Spin-Dependent Phenomena in Magnetoelectronic Devices