Different capping layers were deposited on 2.5 nm Co72Fe8B20 to investigate their effects on damping constants and critical current density (JC0) for spin-torque-transfer switching. The damping constant of CoFeB is affected by the interfacial conditions and the spin-pumping effects. The Cu capping layer significantly suppresses intermixing and possesses the lowest damping constant of 0.009. The micromagnetic simulations reveal that the low damping constant of CoFeB may result in the nucleation of domains at lower current density, and thus reduces JC0. A reduction of 27% in JC0 can be achieved by replacing the conventional Ta capping layer with a Cu layer.
, "Magnetic properties and L1 0 phase formation of FePt films prepared by high current-density ion-beam irradiation and rapid thermal annealing methods" (2005 We investigated magnetic properties and L1 0 phase formation of FePt films by rapid thermal annealing ͑RTA͒ and high current-density ion-beam irradiation. The sample prepared by RTA at 550°C has ͑001͒ texture and strong magnetic perpendicular anisotropy with H c equal to 6 kOe. The sample irradiated at 5.04 A/cm 2 has H c equal to 10 kOe but has isotropic magnetic properties due to the ͑111͒ texture. The magnetic correlation length of the ion-irradiated sample was about twice as large as that of the RTA sample. This may be due to the inhomogeneity of the L1 0 phase formation in the ion-irradiated film.
He + -ion irradiation resulted in the direct ordering of PtMn without postannealing. Samples were irradiated with 2MeV He+ ions and a beam current of 1.08μA∕cm2 such that the corresponding surface temperature was 190°C. The exchange bias direction was set in situ during irradiation in a field of 900Oe. A high giant magnetoresistance (GMR) ratio of 11% was obtained in PtMn-based spin valves after He+ irradiation. The GMR is completely eliminated after it is irradiated with oxygen ions at 42keV. Combining He+ with oxygen-ion irradiation can provide magnetic patterning for GMR sensors.
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