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We have performed an experimental and theoretical investigation on the spinreorientation transitions Ho$_{1-y}$Gd$_y$Al$_2$ compounds. Crystallographic,magnetic and calorimetric measurements have been performed for five selectedsamples in the Ho$_{1-y}$Gd$_y$Al$_2$ series ($y$ = 0, 0.25, 0.5, 0.75 and1.0). From the results, a linear increase in the lattice parameter as afunction of Gd-content ($x$) is observed. Magnetization measurements show thatall samples present collinear ferromagnetism. Specific heat measurements wereperformed in order to detail the first-order spin reorientation transition(FOSRT) that appears for HoAl$_2$ around 20 K. Furthermore, we investigated howthe increase in Gd content affects the character of such phase transition. Ourresults show a slightly modification in the spin reorientation transitiontemperature, which moves to lower temperatures as Gd is increased in HoAl$_2$,whereas for the selected concentrations up to x = 0.75 the first-ordercharacter of the transition is maintained. Such behavior may lead to a largerefrigerant capacity (RC) over a wide temperature range, which is an importantparameter to evaluate the magnetocaloric effect (MCE) of such compounds. Thetheoretical analysis by means of a model Hamiltonian that includes crystalfield, exchange and Zeeman interactions reveals a modification in thecrystal-field acting on Ho ions as Gd-content is increased.

Spin reorientations and crystal field modification in Ho$_{1-y}$Gd$_y$Al$_2$ compounds