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Strained epitaxial growth provides the opportunity to understand thedependence of intrinsic and extrinsic properties of functional materials atfrozen intermediate stages of a phase transformation. In this study, acombination of thin film experiments and first-principles calculations yieldsthe binding energy and magnetic properties of tetragonal Fe70Pd30-xCuxferromagnetic shape memory thin films with x = 0, 3, 7 and structures rangingfrom bcc to beyond fcc (1.07<c/a_bct<1.57). We find that Cu enhances thequality of epitaxial growth, while spontaneous polarisation and Curietemperature are only moderately lowered as expected from our calculations.Beyond c/a_bct>1.41 the samples undergo structural relaxations through adaptivenanotwinning. For all tetragonal structures, we observe a significant increaseof the magnetocrystalline anisotropy constant K1, which reaches a maximum ofK1=-2.4*10^5 Jm^-3 at room temperature around c/a_bct=1.33 and is thus evenlarger than for binary Fe70Pd30 and the prototype Ni-Mn-Ga magnetic shapememory system. Since K1 represents the driving force for variant reorientationin magnetic shape memory systems, we conclude that Fe-Pd-Cu alloys offer apromising route towards microactuators applications with significantly improvedwork output.

Enhancing magnetocrystalline anisotropy of the Fe70Pd30 magnetic shape memory alloy by adding Cu