Epitaxial structure and magnetic anisotropies of metastable single crystal Co0.70Mn0.30 film

      H. W. Zhao 
      National Laboratory of Solid State Microstructures, Center of Materials Analysis, Nanjing University, Nanjing 210 093, People's Republic of China 

      Y. Chen, W. R. Zhu, G. S. Dong, and X. F. Jin 
      National Key Laboratory of Applied Surface Physics, Department of Physics, Fudan University, Shanghai 200 433, People's Republic of China 

      M. Lu and H. R. Zhai 
      National Laboratory of Solid State Microstructures, Center of Materials Analysis, Nanjing University, Nanjing 210 093, People's Republic of China 

(Received 19 June 1996; accepted 10 November 1996) 

Alloy films of Co0.70Mn0.30 were grown on GaAs (001) substrates by molecular beam epitaxy at room temperature. The metastable tetragonally distorted single crystal structure was confirmed by
reflection high energy electron diffraction and x-ray diffraction measurement, which exhibited a 2.87 Å in-plane lattice parameter. Ferromagnetic resonance measurements and theoretical fitting
were performed and showed that, with a Mn capping layer, a uni-directional anisotropy existed. In addition, a fourfold tetragonal magnetocrystalline anisotropy as well as a uniaxial term in the film
plane was also confirmed. The hysteresis loops recorded by longitudinal magneto-optical Kerr-effect also demonstrated the existence of different kinds of in-plane magnetic anisotropy. The origins of
the anisotropy are explained tentatively. ©1997 American Institute of Physics. 

PII: S0021-8979(97)03204-0 
DOI: 10.1063/1.364010 
PACS: 75.70.Ak, 68.55.Jk, 75.30.Gw, 81.15.Hi, 75.30.Kz, 61.66.Dk, 68.35.Bs, 76.50.+g, 75.25.+z, 75.60.Ej, 78.20.Ls