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Materials with a large magnetocaloric response are highly desirable formagnetic cooling applications. It is suggested that a strong spin-latticecoupling tends to generate a large magnetocaloric effect, but no microscopicmechanism has been proposed. In this work, we use spin lattice dynamicssimulation to examine the lattice contribution to the magnetocaloric entropychange in bcc iron (Fe) and hcp gadolinium (Gd) with exchange interactionparameters determined from ab initio calculations. We find that indirectRuderman Kittel Kasuya Yosida (RKKY) exchange interaction in hcp Gd leads tolonger range spin lattice coupling and more strongly influences the lowfrequency long wavelength phonons. This results in a higher latticecontribution towards the total magnetocaloric entropy change as compared to bccFe with short range direct exchange interactions. Our analysis provides aframework for understanding the magnetocaloric effect in magnetic materialswith strong spin lattice couplings. Our finding suggests that long rangeindirect RKKY type exchange gives rise to a larger lattice contribution to themagnetocaloric entropy change and is, thus, beneficial for magnetocaloricmaterials.

Indirect Exchange Interaction Leads to Large Lattice Contribution to Magnetocaloric Entropy Change