L 1_{0}

-type FePd single crystals with a high order degree were prepared by ordering under compressive stress. Experimental and theoretical investigations on the relation among the axial ratio,

d

electron number and magnetocrystalline anisotropy energy (MAE) in

L 1_{0}

-type FePd single crystals have been carried out. In the concentration dependence of the lattice constants, the

a

axis exhibits a strong dependence, compared with that of the

c

axis. As a result, the ratio of

c ∕ a

decreases with increasing Pd concentration. The uniaxial magnetocrystalline anisotropy constant

K_{U}

at the equiatomic composition is evaluated to be

2.1 \times 10^{7} erg ∕ {cm}^{3}

4.2 K

and

1.7 \times 10^{7} erg ∕ {cm}^{3}

300 K

. The MAE becomes weaker as the ratio of

c ∕ a

is apart from unity at higher Pd compositions. The calculated results by the first principles calculations with the LMTO-ASA including the spin-orbit coupling for the MAE of

L 1_{0}

-type

{Fe}_{50} {Pd}_{50}

are in accord with the present experimental results. The increase in the

d

electron number due to the increase of the Pd concentration facilitates the decrease of the MAE, cooperating with the decrease in the axial ratio

c ∕ a

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