Erratum: “Ultrafast laser generated strain in granular and continuous FePt thin films” [Appl. Phys. Lett. 113, 123101 (2018)]

In the original article,¹ a simple miscalculation led to an error in the estimated laser induced temperature change, $ΔT=FadC$⁠, which should yield $ΔT=$ 442 K instead of $ΔT=147 K$ stated in this paper. All values entered in this formula, i.e., the incident Fluence of $F=6$ mJ/cm², the absorbed energy fraction in FePt of approximately 25%, the film thickness d = 9.7 nm, and the estimated heat capacity of C = $3.5×106 Jm3$⁠, are stated correctly in the text. The correct estimation leaves the main findings of the manuscript unchanged but the estimated thermal expansion coefficient on picosecond timescales $α$ has to be corrected by the same factor 3 to yield $α=εΔT=4×10−3 442 K≈9.05×10−6 1K$⁠.