Co crystals with three different structures are realized in the form of single-crystal thin films hetero-epitaxially grown on single-crystal substrates by ultrahigh vacuum rf magnetron sputtering. hcp-, fcc-, and bcc-Co single-crystal films are formed on Cr(211)_(bcc), Cu(100)_(fcc), and GaAs(110)_(B3), respectively. The film growth process is studied by RHEED, and the lattice constants of these Co films are determined by x-ray diffraction. The magnetization properties of these thin films are reflecting the magnetocrystalline anisotropics of Co crystals with the easy magnetization axes along hcp(0001}, fcc(111), and bcc(100) directions.
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