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Effects of annealing and Mg O thickness on perpendicular magnetic anisotropy in Pt/ C o 2 F e A l 0.5 S i 0.5 / M g O / P t multilayers
Author(s) -
Wu Yong,
Li Xiaoqi,
Xiong Qiang,
Gao Shan,
Xu Xiaoguang,
Miao Jun,
Jiang Yong
Publication year - 2014
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201330199
Subject(s) - feal , materials science , annealing (glass) , remanence , condensed matter physics , anisotropy , analytical chemistry (journal) , thermal stability , magnetization , nuclear magnetic resonance , composite material , magnetic field , intermetallic , chemistry , optics , physics , organic chemistry , alloy , quantum mechanics , chromatography
Magnetic properties have been studied for Ta/Pt/Co 2 FeAl 0.5 Si 0.5 (CFAS)/MgO/Pt multilayers to investigate the effects of annealing and MgO thickness on perpendicular magnetic anisotropy (PMA). We show that PMA is very sensitive to the annealing conditions and MgO thickness. Strong PMA with high remanence ratio can be achieved after annealing at 300 °C for just 10 min. The thickness of CFAS ( t CFAS ) with PMA is strongly dependent on the MgO thickness ( t MgO ). A large t CFAS with PMA is observed to be 4.8 nm for t MgO = 1.6 nm. The saturation magnetization ( M s ) decreases on increasing t MgO with an obviously periodic oscillation, and the periods of oscillation are between 0.2 and 0.3 nm. Moreover, the annealed structure shows good thermal stability and a weaker temperature dependence of the squareness ratio ( M r / M s ) for the samples with thicker MgO.