Study On The Temperature Dependent Spin-pumping And Inverse Spin Hall Effect

With the rapid development of science and technology,all kinds of electrical equipment are blooming to develop into miniaturization,integration and portable.The traditional semiconductor devices gradually cannot meet the needs of the people,and the spin electronic devices using electronic spin as energy and information carrier get the attention and researching by scientists at home and abroad,because they have many excellent characteristics with power loss,low energy density and fast response and so on.Spin Pumping-Inverse Spin Hall Effect is a new discovery in Spintronics in recent years,and researching factors influencing on it is helpful for fabricating spintronic devices.In this thesis,we used the method of upper and lower vertical flip samples to separate the Spin Rectification Voltage V_SRERE and the Inverse Spin Hall Voltage V_ISHE.In this thesis,we first investigated the influence of the thickness of NM layer on the Spin Pumping-Inverse Spin Hall Effect in a bilayer FM/NM ferromagnetic thin film.The thickness of NM layers were 2nm,4nm,6nm,8nm and 10nm respectively,we studied the variation trend of the various magnetic parameters,the Spin Rectification Voltage V_SRERE and the Inverse Spin Hall Effect Voltage V_ISHESHE with NM layer thickness.The study found that with the increase of the NM layer thickness,the ferromagnetic resonance linewidth?35?H and ferromagnetic resonance fieldH_rare increasing,but the V_SRERE and V_ISHESHE are decreasing,and the magnetic parameter damping coefficient?obtained by the fitting formula increases from 0.078 to 0.0955,the absolute value of anisotropy constant H_k increases from 14.2Oe to 28.6Oe,and the saturation magnetization M_s decreases from 5106.3Gs to 4818.8Gs.In this thesis,we investigated the spin dependent effects of bilayer ferromagnetic thin film samples at different temperatures.The test temperature increased from 80K to420K,including low temperature and high temperature.The various magnetic parameters'trends are not obvious,are substantially constants with the increase of the temperature in the low temperature 80K-300K range,only in the high temperature300K-420K range,the parameters have certain rules with the change of temperature,which indicated that low temperatures have little effect on the Spin Pumping-Inverse Spin Hall Effect,only high temperatures can have a certain impact on the Spin Pumping-Inverse Spin Hall Effect.The study found that the ferromagnetic resonance linewidth?35?H and ferromagnetic resonance fieldH_rare gradually increaseing,the magnetic parameter damping coefficient?obtained by the fitting formula increases from 0.067 to 0.071,and the saturation magnetization M_s and the absolute value of magnetic anisotropy field H_k decrease from 4706.5Gs to 4434.5Gs,21.5Oe reduced to18.5Oe separately of the bilayer FM/NM ferromagnetic thin films with the temperature increasing.In this thesis,we also studied the temperature influence of three ferromagnetic thin films of Ta/NiFe/Ru sample on the Spin Pumping-Inverse Spin Hall Effect.It is found that the trends are similar to the bilayer FM/NM ferromagnetic thin film sample's trends.