Optimized growth of compensated ferrimagnetic insulator Gd_(3)Fe_(5)O_(12)with a perpendicular magnetic anisotropy  

作　　者：Heng-An Zhou Li Cai Teng Xu Yonggang Zhao Wanjun Jiang 周恒安;蔡立;许腾;赵永刚;江万军(State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics,Tsinghua University,Beijing 100084,China;Frontier Science Center for Quantum Information,Tsinghua University,Beijing 100084,China)

机构地区：[1]State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics,Tsinghua University,Beijing 100084,China [2]Frontier Science Center for Quantum Information,Tsinghua University,Beijing 100084,China

出　　处：《Chinese Physics B》2021年第9期62-71,共10页中国物理B（英文版）

基　　金：Project supported by the National Key R&D Program of China(Grant Nos.2017YFA0206200 and 2016YFA0302300);the Basic Science Center Project of the National Natural Science Foundation of China(Grant No.51788104);the National Natural Science Foundation of China(Grant Nos.11774194,11804182,51831005,and 11811082);Beijing Natural Science Foundation(Grant No.Z190009);the Beijing Advanced Innovation Center for Future Chip(ICFC).

摘　　要：Compensated ferrimagnetic insulators are particularly interesting for enabling functional spintronic,optical,and microwave devices.Among many different garnets,Gd_(3)Fe_(5)O_(12)(GdIG)is a representative compensated ferrimagnetic insulator.In this paper,we will study the evolution of the surface morphology,the magnetic properties,and the magnetization compensation through changing the following parameters:the annealing temperature,the growth temperature,the annealing duration,and the choice of different single crystalline garnet substrates.Our objective is to find the optimized growth condition of the GdIG films,for the purpose of achieving a strong perpendicular magnetic anisotropy(PMA)and a flat surface,together with a small effective damping parameter.Through our experiments,we have found that the surface roughness approaching 0.15 nm can be obtained by choosing the growth temperature around 700℃,together with an enhanced PMA.We have also found the modulation of magnetic anisotropy by choosing different single crystalline garnet substrates which change the tensile strain to the compressive strain.A measure of the effective magnetic damping parameter(α_(eff)=0.04±0.01)through a spin pumping experiment in a GdIG/Pt bilayer is also made.Through optimizing the growth dynamics of GdIG films,our results could be useful for synthesizing garnet films with a PMA,which could be beneficial for the future development of ferrimagnetic spintronics.

关 键 词：FERRIMAGNET perpendicular magnetic anisotropy ferrite and garnet devices crystal growth 

分 类 号：O469[理学—凝聚态物理]