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We have compared and contrasted magnetic, magnetocaloric and magnetoresistiveproperties of Gd and Dy members of the rare-earth (R) series RFe5Al7,crystallizing in ThMn12 structure, known to order antiferromagnetically. Amongother observations, we would like to emphasize on the following novel findings:(i) There are multiple sign-crossovers in the temperature (T) dependence ofisothermal entropy change (DeltaS) in the case of Dy compound; in addition tonil DeltaS at the magnetic compensation point known for two-magnetic-sublatticesystems, there is an additional sign-crossover at low temperatures, as thoughthere is a re-entrant inverse magnetocaloric phenomenon. Corresponding signreversals could also be observed in the magnetoresistance data. (ii) The plotsof magnetoresistance versus magnetic field are found to be highly asymmetricwith the reversal of the direction of magnetic-field (H) well below TN for bothcompounds, similar to that known for an antiferromagnetic tunnel junctions. Weattribute these to subtle changes in spin orientations of R and Fe momentsinduced by T and H.

Magnetic and magnetotransport behavior of RFe5Al7 (R= Gd and Dy):  Observation of re-entrant inverse-magnetocaloric phenomenon and asymmetric  magnetoresistance behavior