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Chinese Physics, 2006, Vol. 15(6): 1351-1355    DOI: 10.1088/1009-1963/15/6/037

Studies on high-moment soft magnetic FeCo/Co thin films

Fu Yu (付煜)a, Yang Zheng (杨正)a, Mitsunori Matsumoto (松本光功)b, Liu Xiao-Xi (刘小晰)b, Akimitsu Morisako (森迫昭光)b 
a Institute of Magnetic Materials, Lanzhou University, Lanzhou, Louzhou 730000, China; b Department of Information Engineering, Shinshu University, Nagano 380-8553, Japan
Abstract  The dependences of soft magnetic properties and microstructures of the sputtered FeCo (=Fe$_{65}$Co$_{35}$) films on Co underlayer thickness $t_{\rm Co}$, FeCo thickness $t_{\rm FeCo}$, substrate temperature $T_{\rm s}$ and target-substrate spacing $d_{\rm T-S}$ are studied. FeCo single layer generally shows a high coercivity with no obvious magnetic anisotropy. Excellent soft magnetic properties with saturation magnetization $\mu_{0}M_{\rm s}$ of 2.35 T and hard axis coercivity $H_{\rm ch}$ of 0.25 kA/m in FeCo films can be achieved by introducing a Co underlayer. It is shown that sandwiching a Co underlayer causes a change in orientation and reduction in grain size from 70 nm to about 10 nm in the FeCo layer. The magnetic softness can be explained by the Hoffmann's ripple theory due to the effect of grain size. The magnetic anisotropy can be controlled by changing $d_{\rm T-S}$, and a maximum of 14.3 kA/m for anisotropic field $H_{\rm k}$ is obtained with $d_{\rm T-S}$=18.0 cm.
Keywords:  FeCo film      sputtering conditions      high saturation magnetization      soft magnetic properties  
Received:  26 October 2005      Revised:  07 March 2006      Accepted manuscript online: 
PACS:  75.70.Ak (Magnetic properties of monolayers and thin films)  
  61.05.cp (X-ray diffraction)  
  68.37.Lp (Transmission electron microscopy (TEM))  
  68.55.-a (Thin film structure and morphology)  
  75.50.Bb (Fe and its alloys)  
  75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)  

Cite this article: 

Fu Yu (付煜), Yang Zheng (杨正), Mitsunori Matsumoto (松本光功), Liu Xiao-Xi (刘小晰), Akimitsu Morisako (森迫昭光) Studies on high-moment soft magnetic FeCo/Co thin films 2006 Chinese Physics 15 1351

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