Current-Perpendicular-to-Plane Magnetoresistance of CoFe-based Exchange-Biased Spin-Valves
- Current-Perpendicular-to-Plane Magnetoresistance of CoFe-based Exchange-Biased Spin-Valves
- 안치의; 신경호; Reza Loloee; Jack Bass; William P. Pratt Jr.
- Spintransport; CoFe; Spin valve; CPP; MR; spin asymmetry; spin diffusion length
- Issue Date
- American Physical Society March Meeting 2009
- Current-Perpendicular-to-Plane Magnetoresistance of
CoFe-based Exchange-Biased Spin-Valves1 CHIYUI AHN,
KYUNG-HO SHIN, Korea Institute of Science and Technology, REZA
LOLOEE, JACK BASS, WILLIAM PRATT, Michigan State University; Concentrated Co(50)Fe(50) and Co(70)Fe(30) alloys are of interest
for spintronics applications. We have constrained the spin-transport
properties of these alloys by measuring at 4.2 K the speci¯c resistance
(CPP area times resistance) and magnetoresistance of exchange-biased
spin-valves (EBSVs) of the form (FeMn/CoFe/Cu/CoFe); here CoFe
indicates one of the two alloys of interest; where the magnetization of
one CoFe layer is exchange bias pinned by the adjacent antiferromag-
netic FeMn layer, and the magnetization of the other CoFe layer is free
to switch from parallel (P) to anti-parallel (AP) to that of the pinned
layer in a modest magnetic ¯eld. For each CoFe alloy, we have measured
EBSVs where the thicknesses of both the ¯xed and free layers were held
equal and varied together, and EBSVs where the thickness of the pinned
CoFe layer was held ¯xed and that of the free layer was varied. From
such measurements we have estimated two parameters: the bulk scatter-
ing asymmetry and the spin-di？usion length, for each of the two CoFe
alloys. We will present both our data and the derived parameters.
1Work supported by US National Science Foundation grant DMR-
0804126 and Korea Institute of Science and Technology.
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