Cobalt ferrite thin films were deposited on TbFeCo(10 nm)/Si(100) and Si(100) substrates at a substrate temperature of 350 ℃ by RF magnetron sputtering. The heat treated films were analyzed by Vibrating Sample Magnet...Cobalt ferrite thin films were deposited on TbFeCo(10 nm)/Si(100) and Si(100) substrates at a substrate temperature of 350 ℃ by RF magnetron sputtering. The heat treated films were analyzed by Vibrating Sample Magnetometer (VSM) and X-Ray Photoelectron Spectroscopy (XPS). Results showed that all films had high coercivity and perpendicular anisotropy especially for the films deposited on TbFeCo underlayer. TbFeCo underlayers increase the coercivity, magnetization and remanence ratio of CoFe2O4 films, films on TbFeCo underlayer had coercivity and magnetization as high as 832×103 A·m-1 and 450×103 A·m-1, and its romance ratio reaches 0.9, which was related to the Tb3+ diffusion from the underlayer into the film.展开更多
The ingots with nominal composition Pr9.5Fe84-xB6.4P0.1Zrx(x=0,1,2,3)were prepared by an electric arc furnace under purified argon atmosphere.The ribbons were obtained by melt spinning at a wheel speed of16-33 m·...The ingots with nominal composition Pr9.5Fe84-xB6.4P0.1Zrx(x=0,1,2,3)were prepared by an electric arc furnace under purified argon atmosphere.The ribbons were obtained by melt spinning at a wheel speed of16-33 m·s-1.X-ray diffraction(XRD)results show that P addition decreases crystallinity of hard phase,but further Zr addition increases the amorphous-forming ability of soft phase.The intrinsic coercivity largely increases from 502(Zr-free)to 945 kA·m-1(2 at%Zr),which is among the highest value reported so far in this poor rare earth nanocomposite magnets.The hysteresis loops of the alloys with addition of 1 at%and 2 at%Zr show good squareness with single-phase characteristic,indicating well exchange coupling between hard and soft magnetic grains.Transmission electron microscope(TEM)results reveal small grain size and uniformity in the microstructure in the Zradded samples,which is the reason for high coercivity.展开更多
基金the National Natural Science Foundation of China (60490296 ,60671029 ,90306015)
文摘Cobalt ferrite thin films were deposited on TbFeCo(10 nm)/Si(100) and Si(100) substrates at a substrate temperature of 350 ℃ by RF magnetron sputtering. The heat treated films were analyzed by Vibrating Sample Magnetometer (VSM) and X-Ray Photoelectron Spectroscopy (XPS). Results showed that all films had high coercivity and perpendicular anisotropy especially for the films deposited on TbFeCo underlayer. TbFeCo underlayers increase the coercivity, magnetization and remanence ratio of CoFe2O4 films, films on TbFeCo underlayer had coercivity and magnetization as high as 832×103 A·m-1 and 450×103 A·m-1, and its romance ratio reaches 0.9, which was related to the Tb3+ diffusion from the underlayer into the film.
基金financially supported by the National Natural Science Foundation of China(Nos.11474184 and 11627805)Shandong Province Natural Science Foundation of China(No.ZR2016EMM14).
文摘The ingots with nominal composition Pr9.5Fe84-xB6.4P0.1Zrx(x=0,1,2,3)were prepared by an electric arc furnace under purified argon atmosphere.The ribbons were obtained by melt spinning at a wheel speed of16-33 m·s-1.X-ray diffraction(XRD)results show that P addition decreases crystallinity of hard phase,but further Zr addition increases the amorphous-forming ability of soft phase.The intrinsic coercivity largely increases from 502(Zr-free)to 945 kA·m-1(2 at%Zr),which is among the highest value reported so far in this poor rare earth nanocomposite magnets.The hysteresis loops of the alloys with addition of 1 at%and 2 at%Zr show good squareness with single-phase characteristic,indicating well exchange coupling between hard and soft magnetic grains.Transmission electron microscope(TEM)results reveal small grain size and uniformity in the microstructure in the Zradded samples,which is the reason for high coercivity.
