  The (In,Fe)Sb layers with the Fe content up to 13 at. % have been grown on
(001) GaAs substrates using the pulsed laser deposition. The TEM investigations
show that the (In,Fe)Sb layers are epitaxial and free of the inclusions of a
second phase. The observation of the hysteretic magnetoresistance curves at
temperatures up to 300 K reveals that the Curie point is above room
temperature. The resonant character of magnetic circular dichroism confirms the
intrinsic ferromagnetism in the (In,Fe)Sb layers. We suggest that the
ferromagnetism of the (In,Fe)Sb matrix is not carrier-mediated and apparently
is determined by the mechanism of superexchange interaction between Fe atoms
(This work was presented at the XXI Symposium Nanophysics and Nanoelectronics,
Nizhny Novgorod, March, 13-16, 2017 (book of proceedings v.1, p. 195),
http://nanosymp.ru/UserFiles/Symp/2017_v1.pdf).
