TY - JOUR
T1 - Influence of spin polarizer on the magnetoresistance, switching property, and interlayer interactions in Co/Pd single spin valves
AU - Tahmasebi, T.
AU - Piramanayagam, S. N.
AU - Sbiaa, R.
AU - Chong, T. C.
PY - 2012
Y1 - 2012
N2 - In order to investigate the effect of polarization and saturation magnetization (M S) in Co/Pd multilayers-based pseudo-spin valve (PSV) structures with perpendicular magnetic anisotropy (PMA), we studied different spin polarizer layers (SPL). The PMA could be achieved by tuning the thickness and M s of the SPL. Sharp switching of magnetization for both soft layer (SL) and hard layer (HL) were observed for all studied structures with thin SPL, indicating higher PMA in the film structures. However, interesting behavior was observed for thicker SPLs where a tail in hysteresis loop was observed. For further understanding of the interactions in multilayers we have carried out first-order reversal curve (FORC) measurements. The FORC contours pointed out the correlation between exchange interactions with magnetostatic interaction and minor loop shifts in hysteresis curves. Giant magnetoresistance (GMR) was observed for the PSV films with thick CoM 65Fe 35 (10 Å and 15 Å) SPL. However, GMR value as a function of thickness decreases for all the other films with different M s. Moreover, we have clarified that GMR is correlated to the fcc (111) orientation of Co/Pd multialyers. The maximum value of GMR with largest M s shows the minimum value of full width at half maximum (FWHM) for fcc (111) peak, indicating that the large GMR as well as high PMA occurs for the samples deposited in good fcc (111) texture.
AB - In order to investigate the effect of polarization and saturation magnetization (M S) in Co/Pd multilayers-based pseudo-spin valve (PSV) structures with perpendicular magnetic anisotropy (PMA), we studied different spin polarizer layers (SPL). The PMA could be achieved by tuning the thickness and M s of the SPL. Sharp switching of magnetization for both soft layer (SL) and hard layer (HL) were observed for all studied structures with thin SPL, indicating higher PMA in the film structures. However, interesting behavior was observed for thicker SPLs where a tail in hysteresis loop was observed. For further understanding of the interactions in multilayers we have carried out first-order reversal curve (FORC) measurements. The FORC contours pointed out the correlation between exchange interactions with magnetostatic interaction and minor loop shifts in hysteresis curves. Giant magnetoresistance (GMR) was observed for the PSV films with thick CoM 65Fe 35 (10 Å and 15 Å) SPL. However, GMR value as a function of thickness decreases for all the other films with different M s. Moreover, we have clarified that GMR is correlated to the fcc (111) orientation of Co/Pd multialyers. The maximum value of GMR with largest M s shows the minimum value of full width at half maximum (FWHM) for fcc (111) peak, indicating that the large GMR as well as high PMA occurs for the samples deposited in good fcc (111) texture.
KW - (Co/Pd)-based spin valve
KW - CoFeB
KW - Giant magnetoresistance (GMR)
KW - Magnetic films
KW - Magnetic memory
KW - Perpendicular magnetic anisotropy (PMA)
KW - Spin valve
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U2 - 10.1109/TMAG.2012.2199969
DO - 10.1109/TMAG.2012.2199969
M3 - Article
AN - SCOPUS:84867772856
SN - 0018-9464
VL - 48
SP - 3434
EP - 3437
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 11
M1 - 6332894
ER -