Current-Perpendicular-to-Plane Magnetoresistance of CoFe-based Exchange-Biased Spin-Valves

Title
Current-Perpendicular-to-Plane Magnetoresistance of CoFe-based Exchange-Biased Spin-Valves
Authors
안치의신경호Reza LoloeeJack BassWilliam P. Pratt Jr.
Keywords
Spintransport; CoFe; Spin valve; CPP; MR; spin asymmetry; spin diffusion length
Issue Date
2009-03
Publisher
American Physical Society March Meeting 2009
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/35066
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KIST Publication > Conference Paper
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