Formation Mechanism of Nano-Oxide Layer on the Surface of Co 2 (CrFe)Si Full Heusler Alloy for nanocontacts CPP-Spin Valves. Y. SHIOKAWA , Y. Saki, S. Kawasaki, M. DOI and M. SAHASHI, Department of Electronic Engineering, TOHOKU UNIIVERSITY. Back ground. Experiment.
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Y. SHIOKAWA, Y. Saki, S. Kawasaki, M. DOI and M. SAHASHI, Department of Electronic Engineering, TOHOKU UNIIVERSITY
Nano-Conatct Magnetoresistance (NCMR)
(Co:Fe:Si= 49.2 : 28.2 : 22.6 )
 Y. Shiokawa, et al, Intermag 2008, ES-05, Madrid, Spain, (2008)
 H. N. Fuke, et al, IEEETrans. Magn. , 43, (2007) , 2848
High spin polarization materials
Cr 5 nm
Ta 30 nm
Cu 285 nm
To clarify the formation mechanism of NOL using high spin polarization material Co2FeSi.
J. Sato, H. Imamura, private communication (unpublished)
Ta 5 nm
Direct obsevation of NOL by cross-section TEM and XPS
Hin dependence of intensity of Natural Oxidation
NOL has no NC
tCr=0 nm (without Cr)
There are big contacts.
NOL A & B
XPS shows NOL is composed of SiO2 and Cr2O3.
tCr=0.1 nm (half ML)
Possibility 1 nm NCs.
Schematic formation mechanism of CFS-CrOx NOL
Relation between MR ratio and RA
ρNC: 100μΩcm、 tNOL=1nm
H. N. Fuke, M. Sahashi et al , IEEE Trans. Magn.,vol 43.6 (2007).
The 2009 Summer School, IEEE Magnetics Society Summer School