Large magnetocrystalline anisotropy energy of L10-type Co100-xPtx bulk single crystals prepared under compressive stress

Shima, H.; Oikawa, K.; Fujita, A.; Fukamichi, K.; Ishida, K.
March 2005
Applied Physics Letters;3/14/2005, Vol. 86 Issue 11, p112515
Academic Journal
L10-type Co100-xPtx single crystals in a single variant state were prepared by ordering under a compressive stress in order to determine accurately the uniaxial magnetocrystalline anisotropy constant KU. Both the lattice constants a and c increase with increasing Pt concentration, whereas the axial ratio c/a becomes minimum at x=50. The value of KU directly determined at 298 K exhibits a maximum value of 4.5×107 erg cm-3 for 50 at. % Pt. The second- and fourth-order anisotropy constants K1 and K2 determined by the Sucksmith–Thompson method become 4.1 and 0.6×107 erg cm-3, respectively. The value of K1+K2 corresponding to the magnetocrystalline energy difference between the c and a axes becomes maximum at x=50.


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