The modification of crystalline structure by epitaxial growth on different single crystals induces crucial effects on the exchange bias coupling. Due to the larger lattice constant ͑a 0 ͒ of Cu 3 Au͑100͒ ͑a 0 = 3.75 Å͒, the vertical lattice constants of Fe/ Fe x Mn 1−x films on Cu 3 Au͑100͒ are much smaller than those of the Fe/ Fe x Mn 1−x /Cu͑100͒ system ͑Cu: a 0 = 3.61 Å͒. By reducing the vertical lattice constants, the interface exchange bias coupling energy of Fe/ Fe x Mn 1−x /Cu 3 Au͑100͒ is enhanced to be 0.12-0.18 erg/ cm 2 , which is approximately four times that of the Cu͑100͒ system.

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