TY - JOUR
T1 - Study of spin valves with L10-FePt pinning layer and different pinned layers
AU - Zhao, Hui
AU - Li, Xuan
AU - Zhang, Zongzhi
AU - Ma, Bin
AU - Jin, Q. Y.
PY - 2007/6
Y1 - 2007/6
N2 - L10 FePt pinned spin valves (SVs) with different pinning/pinned layers: FePt/CoFe, FePt/Ru/CoFe, and FePt/CoFe/Ru/CoFe, were fabricated and investigated. Samples with rigidly ferromagnetic coupled bilayer of FePt (6.0 nm)/CoFe (4.0 nm) show giant magnetore-sistance (GMR) ratio up to 7.06%, which is similar to that in the conventional Mnlr-based SVs. Whereas the free layer coercivity (Hcf) of CoFe (3.0 nm)/NiFe (4.0 nm) is as high as 45 Oe. This is mainly due to the exchange coupling between the free layer and (111) textured FePt layer. Synthetic antiferromagntic structures, FePt/Ru/CoFe and FePt/CoFe/Ru/CoFe, were proved to be very effective in reducing the H cf value by forming a closed flux pathway in the bottom electrode. Compared with FePt/Ru/CoFe SVs, the FePt/CoFe/Ru/CoFe ones show higher pinned layer switching field. The optimized SV structure in this study is glass/FePt (6.0)/CoFe (2.0)/Ru (0.8)/CoFe (2.5)/Cu (2.4)/CoFe (3.0)/NiFe (4.0)/Pt (2.0) (in unit of nm), which exhibits a GMR ratio of 7.04%, a free layer Hcf of 22 Oe, and a pinned layer switching field of 1824 Oe.
AB - L10 FePt pinned spin valves (SVs) with different pinning/pinned layers: FePt/CoFe, FePt/Ru/CoFe, and FePt/CoFe/Ru/CoFe, were fabricated and investigated. Samples with rigidly ferromagnetic coupled bilayer of FePt (6.0 nm)/CoFe (4.0 nm) show giant magnetore-sistance (GMR) ratio up to 7.06%, which is similar to that in the conventional Mnlr-based SVs. Whereas the free layer coercivity (Hcf) of CoFe (3.0 nm)/NiFe (4.0 nm) is as high as 45 Oe. This is mainly due to the exchange coupling between the free layer and (111) textured FePt layer. Synthetic antiferromagntic structures, FePt/Ru/CoFe and FePt/CoFe/Ru/CoFe, were proved to be very effective in reducing the H cf value by forming a closed flux pathway in the bottom electrode. Compared with FePt/Ru/CoFe SVs, the FePt/CoFe/Ru/CoFe ones show higher pinned layer switching field. The optimized SV structure in this study is glass/FePt (6.0)/CoFe (2.0)/Ru (0.8)/CoFe (2.5)/Cu (2.4)/CoFe (3.0)/NiFe (4.0)/Pt (2.0) (in unit of nm), which exhibits a GMR ratio of 7.04%, a free layer Hcf of 22 Oe, and a pinned layer switching field of 1824 Oe.
KW - Giant magnetoresistance
KW - L1 FePt
KW - Spin valve
KW - Synthetic antiferromagntic coupling
UR - https://www.scopus.com/pages/publications/34249071600
U2 - 10.1109/TMAG.2007.892175
DO - 10.1109/TMAG.2007.892175
M3 - 文章
AN - SCOPUS:34249071600
SN - 0018-9464
VL - 43
SP - 2839
EP - 2841
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 6
ER -