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Soo Kim, Chang,Jung, Jin-Won,Choi, Dooho,Sahashi, Masashi,Kryder, Mark H. American Institute of Physics 2014 Journal of Applied Physics Vol.115 No.17
A perpendicular magnetic tunnel junction (pMTJ) device was fabricated using L1(0)ordered FePt electrodes, which were deposited on MgO(8 nm)/CrRu(10 nm)/TiN(4 nm) under-layers. It was found that the MgO/CrRu/TiN under-layer helps lower the required FePt deposition temperature to below 400 degrees C, and provides a well-ordered bottom L1(0) FePt electrode with root-mean-square (RMS) surface roughness close to 0.4 nm. Magnetoresistance (MR) ratio and resistance-area (RA) were measured at room temperature by the current-in-plane tunneling (CIPT) method from a lithographically unpatterned PMTJ sample and 138% and 6.4 k Omega mu m(2) were obtained, respectively. A PMTJ test pattern, with a junction size of 80 X 40 mu m(2), was also fabricated and showed a MR ratio and RA product of 108% and 4 similar to 6 k Omega mu m(2), respectively, in good agreement with the CIPT measurements. (C) 2014 AIP Publishing LLC.