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Instruments / Technical Area	Publication Details	Published	Actions
I06-Nanoscience	Tuning of current-induced domain wall resonance frequency using Gd doping S. Lepadatu , J. S. Claydon , D. Ciudad , C. J. Kinane , S. Langridge , S. S. Dhesi , C. H. Marrows Applied Physics Letters 97 (7), 072507 DOI: 10.1063/1.3481074 Show Abstract ▼ Abstract: The current-induced resonance frequencies of domain walls in parabolic pinning potentials are measured in Gd doped NiFe as a function of doping level. The modification of magnetic properties due to Gd doping results in an order of magnitude increase in resonance frequencies for 10% Gd doping, due to the induced out-of-plane anisotropy, and the resonance frequencies are excited at lower current densities compared to undoped NiFe. These results are reproduced using a one-dimensional model of domain wall resonance, and found to be in good agreement in the small oscillation amplitude limit.	Aug 2010
I06-Nanoscience	Reduction of Threshold Current for Domain Wall Depinning Using Gd Doping of Permalloy Serban Lepadatu , Jill Claydon , David Ciudad , Adam Naylor , Christy Kinane , Sean Langridge , Sarnjeet Dhesi , Christopher Marrows Applied Physics Express 3, 083002 DOI: 10.1143/APEX.3.083002 Show Abstract ▼ Abstract: 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 β 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%.	Jul 2010

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