Yttrium iron garnet(YIG) films possessing both perpendicular magnetic anisotropy(PMA) and low damping would serve as ideal candidates for high-speed energy-efficient spintronic and magnonic devices.However,it is still...Yttrium iron garnet(YIG) films possessing both perpendicular magnetic anisotropy(PMA) and low damping would serve as ideal candidates for high-speed energy-efficient spintronic and magnonic devices.However,it is still challenging to achieve PMA in YIG films thicker than 20 nm,which is a major bottleneck for their development.In this work,we demonstrate that this problem can be solved by using substrates with moderate lattice mismatch with YIG so as to suppress the excessive strain-induced stress release as increasing the YIG thickness.After carefully optimizing the growth and annealing conditions,we have achieved out-of-plane spontaneous magnetization in YIG films grown on sGGG substrates,even when they are as thick as 50 nm.Furthermore,ferromagnetic resonance and spin pumping induced inverse spin Hall effect measurements further verify the good spin transparency at the surface of our YIG films.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.52072060 and 52021001)the National Key R&D Program of China(Grant No.2021YFB2801600)the China Postdoctoral Science Foundation(Grant No.2021M700679)。
文摘Yttrium iron garnet(YIG) films possessing both perpendicular magnetic anisotropy(PMA) and low damping would serve as ideal candidates for high-speed energy-efficient spintronic and magnonic devices.However,it is still challenging to achieve PMA in YIG films thicker than 20 nm,which is a major bottleneck for their development.In this work,we demonstrate that this problem can be solved by using substrates with moderate lattice mismatch with YIG so as to suppress the excessive strain-induced stress release as increasing the YIG thickness.After carefully optimizing the growth and annealing conditions,we have achieved out-of-plane spontaneous magnetization in YIG films grown on sGGG substrates,even when they are as thick as 50 nm.Furthermore,ferromagnetic resonance and spin pumping induced inverse spin Hall effect measurements further verify the good spin transparency at the surface of our YIG films.
