  It has been recently proposed that massive fast-rotating highly-magnetized
white dwarfs could describe the observational properties of some of Soft
Gamma-Ray Repeaters (SGRs) and Anomalous X-Ray Pulsars (AXPs). Moreover, it has
also been shown that high-field magnetic (HFMWDs) can be the outcome of white
dwarf binary mergers. The products of these mergers consist of a hot central
white dwarf surrounded by a rapidly rotating disk. Here we show that the merger
of a double degenerate system can explain the characteristics of the peculiar
AXP 4U 0142+61. This scenario accounts for the observed infrared excess. We
also show that the observed properties of 4U 0142+6 are consistent with an
approximately $1.2 M_{\sun}$ white dwarf, remnant of the coalescence of an
original system made of two white dwarfs of masses $0.6\, M_{\sun}$ and $1.0\,
M_{\sun}$. Finally, we infer a post-merging age $\tau_{\rm WD}\approx 64$ kyr,
and a magnetic field $B\approx 2\times 10^8$ G. Evidence for such a magnetic
field may come from the possible detection of the electron cyclotron absorption
feature observed between the $B$ and $V$ bands at $\approx 10^{15}$ Hz in the
spectrum of 4U 0142+61.
