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Combining density-functional theory calculations with a classical Monte Carlomethod, we show that for B2-type FeCo compounds tetragonal distortion givesrise to a strong reduction of the Curie temperature $T_{\mathrm{C}}$. The$T_{\mathrm{C}}$ monotonically decreases from 1575 K (for $c/a=1$) to 940 K(for $c/a=\sqrtwo$). We find that the nearest neighbor Fe-Co exchangeinteraction is sufficient to explain the $c/a$ behavior of the$T_{\mathrm{C}}$. Combination of high magnetocrystalline anisotropy energy witha moderate $T_{\mathrm{C}}$ value suggests tetragonal FeCo grown on the Rhsubstrate with $c/a=1.24$ to be a promising material for heat-assisted magneticrecording applications.

Tuning the Curie temperature of FeCo compounds by tetragonal distortion