The as-cast Cu-doped Fe_(83)Ga_(17)alloys were prepared by arc-melting.The microstructures and magnetostrictions of(Fe_(83)Ga_(17))_(100-x)Cu_(x)(x=0,3,6,9,12,15)alloys were investigated by X-ray diffraction,scanning ...The as-cast Cu-doped Fe_(83)Ga_(17)alloys were prepared by arc-melting.The microstructures and magnetostrictions of(Fe_(83)Ga_(17))_(100-x)Cu_(x)(x=0,3,6,9,12,15)alloys were investigated by X-ray diffraction,scanning electron microscopy,energy dispersive spectroscopy and strain gauge magnetostriction measurement.Vibrating sample magnetometer was employed to investigate the magnetic properties of(Fe_(83)Ga_(17))_(100-x)Cu_(x)(x=0,3,6,9,12,15).First-principal calculation was employed to make lattice structure and energy simulation.The results indicate that Cu dopants dissolve into A2 lattice by interstitial doping,which induces tetragonal-like distortion of A2 lattice.And the magnetostriction for Cu-doped Fe_(83)Ga_(17)alloys is lower than that of Fe_(83)Ga_(17)alloy.The reduction of magnetostriction is attribute to the increase of Young’s modulus caused by Cu dopants dissolve into A2 lattice by interstitial doping and the decrease of magnetoelastic coupling coefficient for Cu-doped Fe_(83)Ga_(17)alloys caused by Cu dopants dissolve into A2 lattice.展开更多
Dense arrays of Fe-Cr alloy clusters with different Cr ratios were fabricated by gas-phase cluster beam deposition. The complex multiphase structure and various coupling effects in the cluster arrays were studied. A l...Dense arrays of Fe-Cr alloy clusters with different Cr ratios were fabricated by gas-phase cluster beam deposition. The complex multiphase structure and various coupling effects in the cluster arrays were studied. A lattice mismatched tetragonal-like morphology of the Fe-Cr alloy cluster was observed at large Cr ratio. An exchange bias effect was observed and was shown to be dependent on the proportion of the Cr components in the alloy. With the increase of the Cr composition, the exchange bias field became smaller and stronger dipolar interactions between the clusters developed. Residual coercivity and magnetization, which were more remarkable in the tetragonal-like clusters, were observed above the ferromagnetic-superparamagnetic transition temperature. The experimental results of the coercive field and the bias field at different temperatures demonstrated that the tetragonal-like clusters had better thermal stability and greater anisotropy.展开更多
基金the National Natural Science Foundation of China(No.51661027)the Natural Science Foundation of Inner Mongolia(No.2019MS05002)。
文摘The as-cast Cu-doped Fe_(83)Ga_(17)alloys were prepared by arc-melting.The microstructures and magnetostrictions of(Fe_(83)Ga_(17))_(100-x)Cu_(x)(x=0,3,6,9,12,15)alloys were investigated by X-ray diffraction,scanning electron microscopy,energy dispersive spectroscopy and strain gauge magnetostriction measurement.Vibrating sample magnetometer was employed to investigate the magnetic properties of(Fe_(83)Ga_(17))_(100-x)Cu_(x)(x=0,3,6,9,12,15).First-principal calculation was employed to make lattice structure and energy simulation.The results indicate that Cu dopants dissolve into A2 lattice by interstitial doping,which induces tetragonal-like distortion of A2 lattice.And the magnetostriction for Cu-doped Fe_(83)Ga_(17)alloys is lower than that of Fe_(83)Ga_(17)alloy.The reduction of magnetostriction is attribute to the increase of Young’s modulus caused by Cu dopants dissolve into A2 lattice by interstitial doping and the decrease of magnetoelastic coupling coefficient for Cu-doped Fe_(83)Ga_(17)alloys caused by Cu dopants dissolve into A2 lattice.
基金supported by the National Natural Science Foundation of China(No.11627806 and No.61301015)the Priority Academic Programme Development of Jiangsu Higher Education Institutions
文摘Dense arrays of Fe-Cr alloy clusters with different Cr ratios were fabricated by gas-phase cluster beam deposition. The complex multiphase structure and various coupling effects in the cluster arrays were studied. A lattice mismatched tetragonal-like morphology of the Fe-Cr alloy cluster was observed at large Cr ratio. An exchange bias effect was observed and was shown to be dependent on the proportion of the Cr components in the alloy. With the increase of the Cr composition, the exchange bias field became smaller and stronger dipolar interactions between the clusters developed. Residual coercivity and magnetization, which were more remarkable in the tetragonal-like clusters, were observed above the ferromagnetic-superparamagnetic transition temperature. The experimental results of the coercive field and the bias field at different temperatures demonstrated that the tetragonal-like clusters had better thermal stability and greater anisotropy.
