Reduction of Threshold Current for Domain Wall Depinning Using Gd Doping of Permalloy

Reduction of Threshold Current for Domain Wall Depinning Using Gd Doping of Permalloy

The dependence of threshold current on applied magnetic field for domain wall depinning from a pinning potential in Gd doped permalloy wires is measured using pulsed current measurements. By increasing the Gd concentration we find a marked reduction in threshold currents. This is shown to arise due...

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Veröffentlicht in:Applied physics express 2010-08, Vol.3 (8), p.083002-083002-3
Hauptverfasser: Lepadatu, Serban, Claydon, Jill, Ciudad, David, Naylor, Adam, Kinane, Christy, Langridge, Sean, Dhesi, Sarnjeet, Marrows, Christopher
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container_issue 8
container_start_page 083002
container_title Applied physics express
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creator Lepadatu, Serban
Claydon, Jill
Ciudad, David
Naylor, Adam
Kinane, Christy
Langridge, Sean
Dhesi, Sarnjeet
Marrows, Christopher
description The dependence of threshold current on applied magnetic field for domain wall depinning from a pinning potential in Gd doped permalloy wires is measured using pulsed current measurements. By increasing the Gd concentration we find a marked reduction in threshold currents. This is shown to arise due to the enhanced non-adiabatic spin-transfer torque: we calculate the non-adiabaticity parameter $\beta$ to be around 0.11 for 10% Gd concentration. On the other hand we show that the adiabatic spin-transfer torque is largely unaffected by Gd concentrations up to 10%.
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title Reduction of Threshold Current for Domain Wall Depinning Using Gd Doping of Permalloy
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